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S P A C EDIVISION
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Documentation Branch Code 256
76SDS4207
29 FEBRUARY 1976
LANDSAT-1 AND LANDSAT-2 FLIGHT EVALUATION REPORT
23 OCTOBER 1975 TO 23 JANUARY 1976
Prepared By
GE LANDSAT OPERATIONS CONTROL CENTER
For
AERONAUTICS AND SPACE ADMINISTRATION Space Flight Center
Greenbelt Maryland 20771
CC
Co tatN AUS -17 8 INPUT BRAHE
r-F-4oE I E- J
E4A LE T I Contract N ASS- 21808
- 4w M-
ZRO~GEN EAL5 ELECTRIC (d es
76SDS4207
29 FEBRUARY 1976
LANDSAT-1 AND LANDSAT-2 FLIGHT EVALUATION REPORT
23 OCTOBER 1975 TO 23 JANUARY 1976
Prepared By
GE LANDSAT OPERATIONS CONTROL CENTER
For
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
Goddard Space Flight Center Greenbelt Maryland 20771
Contract NAS5-21808
APPROVED AM 0 tkjak Thomas W Winchester
SPACE DIVISION Valley Forge Space Center
P 0 Box 8555 Philadelphia Penna 19101
GENERAL 9 ELECTRIC
LANOSAT- I
TABLE OF CONTENTS
Section Page
INTRODUCTION vii
APPENDIX A - LANDSAT-1 ANOMALY LIST A-i
APPENDIX B - LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES B-i
APPENDIX C - LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD C-I
1 SUMMARY - LANDSAT-1 OPERATIONS 1-1
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i 11-1
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-1
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VIDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
LS-1 iii
LIST OF ILLUSTRATIONS
PageFigure
Effect of Orbit Adjusts on Landsat-1 Ground Track 2-32-1 2-2 Local Mean Time of Descending Node 2-4
3-1 Midday Solar Array Current 3-2
3-2 IA (Midday) Degradation vs Days 3-3
3-3 Actual P3and y (Paddle) Sun Angles Landsat-1 3-4
3-4 Predicted Beta Angles Landsat 1 and 2 1976 and 1977 3-5
4-14-1 Landsat-1 Freon History Orbits 14263 (5-12-75) to 17868 (1-25-76) 4-2 Landsat-1 Remaining Freon Life vs Gating Frequency 4-2
4-3 Landsat-1 Pressure - Roll Gate Prediction 4-2
5-1 Landsat-1 Spacecraft Clock Drift History 5-2
5-2 Landsat-1 Spacecraft Drift and Drift Rate 5-3
9-1 USB Power Output History (Landsat-1) 9-2
9-2 USB (Link 4) AGC Readings at Goldstone with30 Antenna Landsat-1 9-2
11-1 Landsat-1 Sensory Ring Thermal Profile 11-6
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1 13-1
17-1 Computer Map of MSS Scenes This Period - Landsat-1 17-3
17-2 Computer Map of MSS Scenes For First 3 Years Operation - Landsat-1 17-5
17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1 17-7
LS-1 iv
LIST OF TABLES
Table Page
1-1 In Orbit Payload System Performance Launch Thn Orbit 17804 (12176) Landsat-1 1-2
2-1 Landsat-1 Brouwer Mean Orbital Parameters 2-2
3-1 Landsat-1 Major Power Subsystem Parameters 3-7 3-2 Landsat-l Power Subsystem Analog Telemetry (Average Value for Data
Received in NBTR Playback) 3-9
4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary 4-3 4-2 Landsat-1 ACS Voltages and Currents 4-4 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles 4-4
5-1 Landsat-1 Command Clock Telemetry Summary 5-4
6-1 TLM Telemetry Summary 6-1
7-1 Landsat-1 Orbit Adjust Summary 7-1 7-2 Landsat-1 OAS Telemetry Values 7-2
8-1 iMCA Telemetry Summary (Landsat-1) 8-1
9-1 Landsat-i USBPMP Telemetry Values 9-1
10-1 Landsat-1 APU Telemetry Functions 10-1
11-1 Landsat-1 Thermal Subsystem Analog Telemetry (Average Value of Frames for Data Received in NBTR Playback) 11-3
11-2 Landsat-i Compensation Load History 11-5
12-1 NBR Operating Hours by Modes Landsat-1 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1 12-1
13-1 Wideband Modulator Telemetry Values Landsat-l1 13-2
14-1 Landsat-1 AMS Temperature Telemetry 14-1
15-1 WBVTR3-l Telemetry Values 15-1
17-1 MSS Telemetry Values 17-1 17-2 MSS Response History Landsat-1 17-10
LS-1 vvi
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
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1 14 166 1 422 19819-19832 I 126-139 1 10 1 79 I 6151 i23 19833-19846 I 1 4 0-153 jiL i9j
16 16 1 1424 19847-19860 I 154-1b7 1 12 1 79 1 17 1 169 1 1425 1 19861-19741 16R-181 1 13 1 79 1 I 16 170 1426 1 19987 88-l- 182-15 14 I 79 1
I 19 171 1 1427 19889-19902 1 196-209 1 15 I 79 I 0 1 172 1 1426 19903-19916 1 2175223 1lb I 179 1
21 1 173 1 1Q29 1 19917-19930 1 224-237 1 17 I1 9 I 22 j74 j3 191194 239-251 TiT1 I3 ii75i 1431 I19945-19958 1 1i4 i O I
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1 29 18 I 1437 I 20029-20042 1 85- 98 7 1 0 I 30 1 182 1 143 8 I 200 4 55200- 49q-111 8 o
B-14 Ishy
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- -
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LANDSAT-1
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LS-i B-15
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B-is LS-1
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LS-1 B-19
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B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
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bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
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B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
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I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
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1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
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p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
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1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
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t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
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a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
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10 1
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1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
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VI I ai PA i 7 400 1 556A- 5581 23iM-251 I is 21 1 i 7 158I---4-t-t-51-q---- 1------ VF-l1 1
IP8I fi 402 1 r56SAA I 1- 28 1 2 1 22 1
LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
I A I h I u5 I h65- bAhn I II R I h I 2e I I I 67 07I 5666- 547q I Agi- 9 I 7a P2 1
0 ba I 4u IA4 8 U I ~~I
I 6 I 66 1 409 I q694- 6707 I 1t-1t26 9 I 22 I II FR I 4to I a 1 68 1 411 1 5721- 5714 1 14nfl15 1 11 1 P2
1 10 1 70 1 413 I q749- B762 I 16-181 1 13 P2 I i i I 7gid R763- 571 I Tx vt 5 I 1w I -e I
I 12 72 4plusmn5 I 5777- 5790 I IqA-Pfq I 1 22 I 1 73 t -trr5St-WRoPAn--T-19--1 22
I 14174 1 17I qS5-Si8 I 2P4-P7 1 17 1 P2 I i i 8 5I1--q -- 1T --- t- P7 -
I 16 76 1 419 I q83 - 5446 I 1 I1 I 23 I 1 1 1 J I1 2 1 A0 S~MU I INfl ia e i CA I 1 IS 1 78 1 421 I q861- Sg74 I q 42 1 24F 23 1 14 0 422 1 ampcm I nr --1 tsfl---qr- b I-n--I P0 I AO 4231 989- sqnP I 57- 701 5 1 3 I
I p I 2 4225 1 R917- Sqqo I 81 Ir- 7 1 23 1 ps j ms l 42 1 S3-5444 I I x 3 rIq1e
S94 I A41 427 I q945- sqSR I 111-1 6 I 9 1 P3 I I to S i tc5428 1 73 0 1 2 I9-qti
1 96 R6 I q97P- 5q85 I Ian-153 I It I P3 II 429
I P8 I AS I 42plusmn I 6000- 6013 I 16R-181 I 1 3 1 23 I v I A3 1 4 2 1 MUI19A I oi I4 1f l iA 1u iI
I t0 I 90 I 433 I 602R- 6n4 I 19AP09 I IS I P3 I 4S1 pwn 9 MLMssfrtrP283-MIS I A
B-10 LS-2
OEP PUAE OF THORMWAL PAGE IS Poop
LAN0hATP
AIfls19WJA
W W
I IGMT rI Gl(HT ISPACECRAFT I REFFRrEzCE REF CYCLE I I tJAIW I LJAJ I ~jAT I Uf~bI I I tMii urr-7yINrr-T
-----------------------------------------------------shy921-25-r--sS-6snsrr--2awPlnr1-1 1-i-23-
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I 495g1 438 1 A099-A6111I R- 2A 1 2 24 1 5 1 461 s I Allo- S12b 1 79I - 7 6 tQ7 40 I Aip6-619q 1 1 w R6 I 4 24 1
1 i qg19 442 1 Aj46167g1 71-84 1 Aji 24 11
110 1 101 1 44 1 Ai8P 619S I 1 9 24 1Iqtt 1
112 1 10)3 1 446 1 6210- 6PP2 I127139 I 10 1 24 1 1 is I 0 1 4 7 1AI~lt-6 6
116 loft 1 448 16237- 6250 I lq4167 I lp 24 1 1 ~ ~ 0 ~-9-T-2~ ~ 19a 1 14-r- -n- I Mrt---24 1
IIamp I6107 1 450 1 6265- 6P79 I jAm195 1 14 i P4 I 1 l 11 10 1 4b I hdL4it hP3 I 19A[N9 I I1b TPWTej
IIS I I og 1 452 1 A293- 6106 1 21n-2P3 1 16 1 24 1 Itti -a3--T--R307rsi-t-1-n2flr---7 -- F--
PO I0111 1 454 1 Aq221-AibUI 21R2Pi1 I 9 1~ P4 1 Pi Ii11o 55 nSjfiS611A I - -- T -1 -P5 -
I PP 1 113 1 456 f349- 61AP I 1~- 28 I PS I I P3 -T ip 7 l i 4 1 rAda I --1 Id 3 -s I V4 I lis 1 458 1 677 6190 1 41- 56 I 4 1 P5
I P6 iW 1I 460 1 A405- 64IA I 71- R4 1 6 1 25 1
I VRgt1i11 I 462 1 6433- 6446 1 9-112 I A I P I I W I Iwo I Ib Ai -a bu i I o Ihi Ii~t I A20 1 121 I 464 1 6461- 6473 1 127-139 1 to 1 25 I
LS-2 B-11
LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
P 1 193 1 466 1 A4gAshy got 1 154-167 1 12 1 25 1
I I 1 b4 7 170I U 57 I 21RM-3 I 1 I P F 14 I 1 468I Sj6- 6r9 I jj95 I 1 41 P I
I A I
I- I 1p71 li
b 470 74
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6qRE I 2qR-PSI I qqrF4l wWi7
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10 121 474 I A00- 6413 1 7- 28 1 2 26 I 11 1 4 1AI 1 1 A614- SlAFI I F9 4e 1 41 i I
I 1 13 1 476 I A 2- 6A411 4q5 I41 26 1
I 4 Is1 4784 765- 6A69 1 71-84 1 6 l 261
I 16 1 137 1 480 I 6694- 6A97 I QQ-_p I A 1 P6 1 1 1 1 i - 7 1 1I1h ii -1 12 1 -T - - - -F--
1 s a8129 I 482 1 A71P- 67P4 1 127-139 1 to i 26 1 -r-19-1-140-1--483m1W725fl--72rfllIr I Irm -r T
I 00 I 141 494 I A573q- 675 I 15IA7 I 12 I 26 1 1l I i f nrr-r-rnm-T 9f r -- TshyT-17 --
I pp I 1Ja I 496 I 5767 67A I jRj5 1 14 1 26 1 1 P I 1 47 1 781 eA4 1 -- FU It s r
1 P4 1 145 1 488 1 6795-SROSI1 210-223 1 16i1 26 1
I P6 1 147 1 490 I 69523- 626 I 2I2-251 I 18 I 26 1 i V7 i ii- i -4-- i - 69A - I - 70i t 1I--7t--I-B P8 1 149 1 492 1 6851 6A64 I t- 22 2 1 27 1 1 W9 Ih 49 hfa I o-4 4e 1 1 1 el Ishylfl 1 AMCf-
1 20 I 151 I1 494 1 6979- 6A99 I 41 56 1 4 1 P7 I al9 i m u Ift mn89si-qn-r 10je 1
B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
I IRS 1 -96-j----i9O7---fii 1 71 A f ft1 7 1 I P I 154s I 497 I A921- 6934 I 89- 98 7 I 27 I
I 1I 166 499 g 4949- 6q62 I 11 -P6 1 9 1 P7 I
I I 1f tIuu 1 A I hb97 I 17lA3 I 10 I 2 I s 0 I 1i4f-13 1 11 1 27 1I I I Sol i A976- 6eq8
7 i 1s1--- I r ----- I- S----qn-n-I--Rt1-i7---7i 9 I 160 1 503 I 7004- 7n17 I IAA-11 1 13 1 P7
I I Ifil I 504 I 70plusmn97fWlA I IMPa ITJ - F I la I 12 I 505 I 7039 7M45 I 19A-oq I It I P7 I 11 1J 1~ MM 10 I I I elI1U Ufilf 2IMlt2e lb IV I 164 507 I 7060- 7173 I P4l-P7 1 17 1 7 1 11 1n POS- IUf78F1S~M1 14 I 166 1 509 i 708 71 1 I 1- 4 I 1 P8In 116--1--510 1 top 1-T- -T -1- 87-fshy
1 16 1te8 1 Sit I 7116- 7129 I pq amp2 1 3 1 29 1 Iif I ISft 1 01i 1t71au 7144 1 4 flbs I 16 tFs IA I 170 I 513 I 7144 7157 I 57v 70 1 S I 8 I 111 1-t I t a1 2-1-r-Tt84r1T-l
0O 1 172 515 I 7172 71RS 1 8t 9 71 28S -l I 1 516 1 7 - rr-r rTgr--shy
jPP 11741 517 I 7200-7P13 I ti-26 1 91 281
I Pb I 176 1 19 I 7P27- 7 40 I 1n-153 1 11 I pa I
I PA I 178 1 521 I 7255- 7PAA I IAA-tIII 13 1 28 I -r--7--r-t2---t ----- 1269r7fl2 tt---182 95--T---r -- 8---tshy
na I 10 523 I 728- 7296 I 19A-P09 1 15 PS I
415 1I~ I 0 I levi 14u1U 2e1 --- 3 1 I s-r 130 1 1 525 1 7311-71P4 1 294-237 17 I 28 1
LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
I UiTr I UAT I UAY I I N Iq---T-Ar -WT
-iA3-T---73 6-1 - T 2 1 IR 1 527 I 7339 7 P I 1- t I 1I 29 I
A in ntc I 74hft IIN-- T~wS--eg1 0 vT shy
a I 18 529 I 7267 7RO I Q- 42 I a I P9 1 I IM7lfli I 4tr714 1I-b 4 I I
irmr-r- - S -- F-
I -I JAI 531 I 7395 740A 1 57- 7n I 5 i P9IR
88 190 1 533 1 742-7416AI r 98 1 71 P9 I 7RD- ij----F r
10 192 35 1 7451- 7464 I11-t26 I 9 29 1 I S6 77-fln9T - - -
I I Iwrr- 37 sa-i----i- -shy
1 I na I 148i 171 1 10F 29 = I1 I q I 537 1 7478- 74Q1 I 14 t53 I 11 I P9 3 B 15t 3amp-7tjFlr~SfTrTamp12Fshyla a
I I 196 I 539 I 710- 7q19 I IAA-181 I 13 1 29 1 19T-t 5-0-- 1-la-FrT~rr 1amp f -r
116 1iq8 541 I 7534 7947 1 19AP09 I 15 1 P9 1 1I 1 I T93 I Sie I tflw II I cinPt7t7--r6 I f i
I t1 PO01 53 I 756P- 7R75I 2P4P37 1 171 P9 I imI - 54-----r--7576a-7 r--P--t0 Fl-T-mI
S0 1 021 545 1 7590- 7AM3 114 I 1 30 1 i I et~r-----4I6 I 7 --- T7-F----TWa -P8---r- - 2 - ----3---r I PP I 204 I 547 I 7618- 7A1 I PQ 42 1 I2 320
1 W2 481 Cus1 h~f I Et 1 4 i LUI
I P4 12061 549 1 764h- 79I9 S7- 70 I SI 30 1 I e 12 50 17ff~7t1 1f N i u i I b I p08 I 551 I 7674- 7A87 1 Rq 98 I 7 1 s0 I
P 9 so-f-r-3-I PA 12101 553 1 7702- 7715 11i-126 I 9 1 30 1 I PV I IIa I bb 1 I1 I7 IT- 19---7-197 I lo10 30 -T I 20 1 P12 I 5S5 I 772q- 774P I 14M-153 I 11 30 I
I - I I s---- inf--T---
-
LS-2 B-14
LANOSAT-9
AU a1976
I I G lT I i UIHT SPACECRAFT I REFFRENCr I REF CYCLE I
I UNIF I A I I 777 I7I I Qwtsi is I 1XT I NO0 I
I ~ r~ - tift---r--77-7u--- I I
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114 PP7 570 1 7939- 7qP I qqjp I a g 31 1
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S-2 B-15
--
L AN-S-A1-P
I I GMV I I 161T I qPACzCRAFTr RErF-RENC REF I CYCLE I
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LANDSAThP
flCTs 1976
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LS-2B17
LANDSA- P
NOV 1970
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--LUANO T-0
DELP 197
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LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
76SDS4207
29 FEBRUARY 1976
LANDSAT-1 AND LANDSAT-2 FLIGHT EVALUATION REPORT
23 OCTOBER 1975 TO 23 JANUARY 1976
Prepared By
GE LANDSAT OPERATIONS CONTROL CENTER
For
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
Goddard Space Flight Center Greenbelt Maryland 20771
Contract NAS5-21808
APPROVED AM 0 tkjak Thomas W Winchester
SPACE DIVISION Valley Forge Space Center
P 0 Box 8555 Philadelphia Penna 19101
GENERAL 9 ELECTRIC
LANOSAT- I
TABLE OF CONTENTS
Section Page
INTRODUCTION vii
APPENDIX A - LANDSAT-1 ANOMALY LIST A-i
APPENDIX B - LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES B-i
APPENDIX C - LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD C-I
1 SUMMARY - LANDSAT-1 OPERATIONS 1-1
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i 11-1
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-1
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VIDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
LS-1 iii
LIST OF ILLUSTRATIONS
PageFigure
Effect of Orbit Adjusts on Landsat-1 Ground Track 2-32-1 2-2 Local Mean Time of Descending Node 2-4
3-1 Midday Solar Array Current 3-2
3-2 IA (Midday) Degradation vs Days 3-3
3-3 Actual P3and y (Paddle) Sun Angles Landsat-1 3-4
3-4 Predicted Beta Angles Landsat 1 and 2 1976 and 1977 3-5
4-14-1 Landsat-1 Freon History Orbits 14263 (5-12-75) to 17868 (1-25-76) 4-2 Landsat-1 Remaining Freon Life vs Gating Frequency 4-2
4-3 Landsat-1 Pressure - Roll Gate Prediction 4-2
5-1 Landsat-1 Spacecraft Clock Drift History 5-2
5-2 Landsat-1 Spacecraft Drift and Drift Rate 5-3
9-1 USB Power Output History (Landsat-1) 9-2
9-2 USB (Link 4) AGC Readings at Goldstone with30 Antenna Landsat-1 9-2
11-1 Landsat-1 Sensory Ring Thermal Profile 11-6
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1 13-1
17-1 Computer Map of MSS Scenes This Period - Landsat-1 17-3
17-2 Computer Map of MSS Scenes For First 3 Years Operation - Landsat-1 17-5
17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1 17-7
LS-1 iv
LIST OF TABLES
Table Page
1-1 In Orbit Payload System Performance Launch Thn Orbit 17804 (12176) Landsat-1 1-2
2-1 Landsat-1 Brouwer Mean Orbital Parameters 2-2
3-1 Landsat-1 Major Power Subsystem Parameters 3-7 3-2 Landsat-l Power Subsystem Analog Telemetry (Average Value for Data
Received in NBTR Playback) 3-9
4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary 4-3 4-2 Landsat-1 ACS Voltages and Currents 4-4 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles 4-4
5-1 Landsat-1 Command Clock Telemetry Summary 5-4
6-1 TLM Telemetry Summary 6-1
7-1 Landsat-1 Orbit Adjust Summary 7-1 7-2 Landsat-1 OAS Telemetry Values 7-2
8-1 iMCA Telemetry Summary (Landsat-1) 8-1
9-1 Landsat-i USBPMP Telemetry Values 9-1
10-1 Landsat-1 APU Telemetry Functions 10-1
11-1 Landsat-1 Thermal Subsystem Analog Telemetry (Average Value of Frames for Data Received in NBTR Playback) 11-3
11-2 Landsat-i Compensation Load History 11-5
12-1 NBR Operating Hours by Modes Landsat-1 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1 12-1
13-1 Wideband Modulator Telemetry Values Landsat-l1 13-2
14-1 Landsat-1 AMS Temperature Telemetry 14-1
15-1 WBVTR3-l Telemetry Values 15-1
17-1 MSS Telemetry Values 17-1 17-2 MSS Response History Landsat-1 17-10
LS-1 vvi
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
lb 349 1 1240 1I7282-1794 1 99-111 i 8 1 amp9 1
16 350 I 1241 1 17295-17308 1j-125 9 amp9 3 1I 124 2 1 17309-17322 1 126-139 10 1 amp9
I 352 I 1243 I7323-1733b 1 140-153 11 1 9 1
I 35a I 2 17337-17350 1 154-167 12 1 9
20 I3511 245 17351-17364 1 16R-181 13 1 9 1 21 I 355 I 124 I 1736b-17378 I 182-195 14 1 9 I
22 356 I i 1 I 17379-17392 I 196-209 15 1 pound9 1shy
124 823 357 1 17393-174o06 210-223 i lb 1 9
24 358 124 5 1 17407-17420 I 224-237 1 17 A9 1 25 359 150 17421-17434 1 238-251 18 i 9
26 360 2n 1174 I 1 70I II 44s T--14 11 1 1 1- 28 2 p 70 I
1252 17449-1746227 361 28 362 1253 17463-17476 1 - +2 1 - 3 -1 70 P9 363 1 1254 1 17477-17490 1 43 56 1 4 1 0 1
3c) 364 I255 17491-17504 I1 57- 70 1 5 1 70 31 365 1 1256 1 17505-17518 1 71- 84 j 6 1 70 1
------------------------------------------- ---------------------shy
LS-1 B-8
________
_ _ ---------------------------------------------------------------
LANDSAT-1 ________JANt976 _ _ _ _ _
I I GMT I FIIUHT I SPACECRAFT I NEFERENCE I REF I CYrLE I
i Dllil iL I 1S tbI tljlAlLJlt ItitL
1 1 1 - 1 - - 17519-17S32 1 S- 98 -7_- 70 1 2 1 2 I 12bg I 17533-17545 I 99-111 8 I 70 1
3_l__A25 9__ 1754b-17559j11125 -9 1 ---70 1 4 1 4 1 1260 I 17560-17573 I 126-139 I 10 I 70 _ L 5J_2 L 1L17 5 74-17587 1A0o 15$___ L_0 shy
6 I 6 12b2 I 17586-17601 1 154-167 i 12 i 70 1
_j_ 7 _I _7 I1A23 I 17632-17615 1 __168-181_ _I _13 1_ 70 I b 8 I 1264 I 1761b-17629 I 18-195 I 14 I 70 1 I 9 j 9 I i2t5 J 17630-7h43 _L 196-2Q9 1-5 t270 I I 10 I 0 I 1266 I 17644-17657 1 210-223 I 16 I 70 11 1l 26f__J17656-17671 __224-237 _ 0I__i J_ 17 1
I1P 12 I 1268 I 17672-17685 238-251 1 18 I 70 13 iJ 13 -L-- 1269 I 1768b17699 L-- 11LJ jI1L_
I 4 14 I 1270 I 1770u-17713 1 15-28 1 2 I 71 I 1I1271 j__17714-17727 j _ _29- 42 1_ 3 I 71 i
lb I 16 I 1272 I 17728-17741 1 43- 56 I 4 1 71 I
J 1 -A7_ j1 A7 _5h1 1kL_177 4i -17755fi_57- 70 I
1 1 1 1274 1 1775-17769 71- 84 1 6 I 71 I 1j 19 1-- 7 77 - 77 85 8 98-- I7- 7_i 1
I 20 I 20 1 276 I 17784-17796 I 99-111 I I 71 1 1 21 I21_j_ 277 LI 7797-178_1_110 _-125_ _91 1 2 I 22 I 1278 I 17811-17824 I 126-139 I 10 I 71
9 53I P3 I 23 1 iP7 I 17825-17838 I 4p_1 L_ 2171 I 24 I 24 I 126O I 17839-17952 I 54-167 I 12 I 71 I L t1 25LW2amp1 L1753-178 6_ 16-181L l3 7_1 _L
2b I 26 I 1282 I 17867-17A80 I 182-195 I 14 1 71 I 8j2j7 2 _L1283___L_17 1-17A94_A_196_209 __ 15 - 71 [
I 29 I 28 8 I 17895-17908 1 210-223 I 16 1 71 I
9 1 85 17909-1792__ 224-237 i17_ I 30 1 30 I 1286 I 17923-17936 I 238-251 I lb I 71 I I 31 I 31 I 12t7 I 17937-17950 I 1 14- 1 _ _
LS-1 shy
--------- --- ------------- --------- -- --- ---
----- - - ----------------------
rES6i 976
I REFI CYrLE IGMT I Fl IGHT I SPACECRAFT I REFERENCE I DATF I DAY I nAY I ORBITS I ORBITSiDAY _ N I
---------------------w------------------- --------------shy1 1 I i 88L1179~II964LLI IS-2 8 I L1 2
i28 9 3 1 72 I2 33 1 1 1796b-17978 1 29- 42 I It3 34_ S290_j_ --7979I --- 56 122 _I__ 5 [4 j1
4 I 35 I i29 1 I 17993-1800b I 57- 70 5 I 72 1
S5 I 36 I Q22 1 18007-18020 I 71- 8 b 72 I
6 37 I 1293 I 18021-18034 85 98 j 7 I 72 I
3 I294 18035-180 4 7 I 99-11 I 8-1 72 1
h I jI 12 9 5 i18046-18061 112-125 I 9 72 1I 1 i I 72 I_
9 40 1 1296 1 18062-18o75-I 126-139 I)0 I III 1807b-18089 I 140-o3 I 11 1 7e I
42 1 iP98 18090-18103 154-167_ 1 1 7 L11 I 129 9 1 18104-18117 1 168-181 1 13 1 722 I3 112 4z __ Lj i 4 4_L 1300 _2L-8 I8P-195 __
14 I 1 i301 1 18132-18145 1 196-209 1 15 1 2 I I 46 1 302 I 1814t-18159 1 21o-223 1 16 72 _
t6 I jslS16o-18173 224-237 1 17 72 I
17 48 1 1304 I 18174-18187 1 238-251 1 18 1 72 I 1- 14 1 1 1 73 118 49 I 1305 I 18186-18201 I
9 - 50 1 1306 I 18202-18215 1 i5- 28 a P I 73 I
20 I 10 181- -5 1 29- 42 1 1i I 1 a52 I 308 1 18230-18243 43- 56 1 4 73
22 53 130o0 Ia 82J44-1S2574- 70 3
I a 1310 I 18258-18271 1 7 8 123 54 - 9 13-shy24 I 5I i1 I 1fKu-1babbf I
I5 Sb I 312 1828b-18298 I 99-111 1 1 73
25 55 I T 8 T~ T j~ F - C9 i I3 27 I 58 I 1314 I 18313-18326 I 126-139 1 10 I 73 I I8 I I j3j8--4o--7-0 I 14o-16 3 11 1 shy
j 73 Ip9 I 60 I J316 I 18341-18354 I 154-167 -12
B-10bshy
-----------------------------------------------------------------
------------------------------------------------------
I I GMT I Fl IGHT I SPACECRAFT I REFFRENCE I REF I CYrLF I I DATF I DAY I DAY ji___a ITs I ORBITS-- I -DAY-J-WN _ _
I I I 61 I 17 __83518368LA68161 1- 13 1 73 1 I P I 62 I 1318 I 18369-18382 1 18-195 I 14 I 73 I L 31 63 319--l--18383-18-396__I---1-96209 I 15 I _ _-73 _ 1- I I 64 1 1320 1 18337-18410 1 210-223 I lb I 73 I 1 5 I 65 I 132LtA841l-42- -- 2-23l- - 7tL
1 6 I 66 1 1322 1842S-1843d 1 238-251 I 18 I 73 I
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B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
VI I ai PA i 7 400 1 556A- 5581 23iM-251 I is 21 1 i 7 158I---4-t-t-51-q---- 1------ VF-l1 1
IP8I fi 402 1 r56SAA I 1- 28 1 2 1 22 1
LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
I A I h I u5 I h65- bAhn I II R I h I 2e I I I 67 07I 5666- 547q I Agi- 9 I 7a P2 1
0 ba I 4u IA4 8 U I ~~I
I 6 I 66 1 409 I q694- 6707 I 1t-1t26 9 I 22 I II FR I 4to I a 1 68 1 411 1 5721- 5714 1 14nfl15 1 11 1 P2
1 10 1 70 1 413 I q749- B762 I 16-181 1 13 P2 I i i I 7gid R763- 571 I Tx vt 5 I 1w I -e I
I 12 72 4plusmn5 I 5777- 5790 I IqA-Pfq I 1 22 I 1 73 t -trr5St-WRoPAn--T-19--1 22
I 14174 1 17I qS5-Si8 I 2P4-P7 1 17 1 P2 I i i 8 5I1--q -- 1T --- t- P7 -
I 16 76 1 419 I q83 - 5446 I 1 I1 I 23 I 1 1 1 J I1 2 1 A0 S~MU I INfl ia e i CA I 1 IS 1 78 1 421 I q861- Sg74 I q 42 1 24F 23 1 14 0 422 1 ampcm I nr --1 tsfl---qr- b I-n--I P0 I AO 4231 989- sqnP I 57- 701 5 1 3 I
I p I 2 4225 1 R917- Sqqo I 81 Ir- 7 1 23 1 ps j ms l 42 1 S3-5444 I I x 3 rIq1e
S94 I A41 427 I q945- sqSR I 111-1 6 I 9 1 P3 I I to S i tc5428 1 73 0 1 2 I9-qti
1 96 R6 I q97P- 5q85 I Ian-153 I It I P3 II 429
I P8 I AS I 42plusmn I 6000- 6013 I 16R-181 I 1 3 1 23 I v I A3 1 4 2 1 MUI19A I oi I4 1f l iA 1u iI
I t0 I 90 I 433 I 602R- 6n4 I 19AP09 I IS I P3 I 4S1 pwn 9 MLMssfrtrP283-MIS I A
B-10 LS-2
OEP PUAE OF THORMWAL PAGE IS Poop
LAN0hATP
AIfls19WJA
W W
I IGMT rI Gl(HT ISPACECRAFT I REFFRrEzCE REF CYCLE I I tJAIW I LJAJ I ~jAT I Uf~bI I I tMii urr-7yINrr-T
-----------------------------------------------------shy921-25-r--sS-6snsrr--2awPlnr1-1 1-i-23-
V I qa 36 I6070-bo0I1 21AEt I ISi1 23 1 a 1v 9 1p 4 amp l9 F T 1 jai P4
I 495g1 438 1 A099-A6111I R- 2A 1 2 24 1 5 1 461 s I Allo- S12b 1 79I - 7 6 tQ7 40 I Aip6-619q 1 1 w R6 I 4 24 1
1 i qg19 442 1 Aj46167g1 71-84 1 Aji 24 11
110 1 101 1 44 1 Ai8P 619S I 1 9 24 1Iqtt 1
112 1 10)3 1 446 1 6210- 6PP2 I127139 I 10 1 24 1 1 is I 0 1 4 7 1AI~lt-6 6
116 loft 1 448 16237- 6250 I lq4167 I lp 24 1 1 ~ ~ 0 ~-9-T-2~ ~ 19a 1 14-r- -n- I Mrt---24 1
IIamp I6107 1 450 1 6265- 6P79 I jAm195 1 14 i P4 I 1 l 11 10 1 4b I hdL4it hP3 I 19A[N9 I I1b TPWTej
IIS I I og 1 452 1 A293- 6106 1 21n-2P3 1 16 1 24 1 Itti -a3--T--R307rsi-t-1-n2flr---7 -- F--
PO I0111 1 454 1 Aq221-AibUI 21R2Pi1 I 9 1~ P4 1 Pi Ii11o 55 nSjfiS611A I - -- T -1 -P5 -
I PP 1 113 1 456 f349- 61AP I 1~- 28 I PS I I P3 -T ip 7 l i 4 1 rAda I --1 Id 3 -s I V4 I lis 1 458 1 677 6190 1 41- 56 I 4 1 P5
I P6 iW 1I 460 1 A405- 64IA I 71- R4 1 6 1 25 1
I VRgt1i11 I 462 1 6433- 6446 1 9-112 I A I P I I W I Iwo I Ib Ai -a bu i I o Ihi Ii~t I A20 1 121 I 464 1 6461- 6473 1 127-139 1 to 1 25 I
LS-2 B-11
LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
P 1 193 1 466 1 A4gAshy got 1 154-167 1 12 1 25 1
I I 1 b4 7 170I U 57 I 21RM-3 I 1 I P F 14 I 1 468I Sj6- 6r9 I jj95 I 1 41 P I
I A I
I- I 1p71 li
b 470 74
I hbriO X3-6r1 543 I AS44 - 6R7 I 21n-2P3 124tri71 73
IWF 1 T
1A t7E-T
25 L
I 1
a 9 IP 7 130 1
472 43
I 1
657P-AntSW
6qRE I 2qR-PSI I qqrF4l wWi7
IA P5 I
10 121 474 I A00- 6413 1 7- 28 1 2 26 I 11 1 4 1AI 1 1 A614- SlAFI I F9 4e 1 41 i I
I 1 13 1 476 I A 2- 6A411 4q5 I41 26 1
I 4 Is1 4784 765- 6A69 1 71-84 1 6 l 261
I 16 1 137 1 480 I 6694- 6A97 I QQ-_p I A 1 P6 1 1 1 1 i - 7 1 1I1h ii -1 12 1 -T - - - -F--
1 s a8129 I 482 1 A71P- 67P4 1 127-139 1 to i 26 1 -r-19-1-140-1--483m1W725fl--72rfllIr I Irm -r T
I 00 I 141 494 I A573q- 675 I 15IA7 I 12 I 26 1 1l I i f nrr-r-rnm-T 9f r -- TshyT-17 --
I pp I 1Ja I 496 I 5767 67A I jRj5 1 14 1 26 1 1 P I 1 47 1 781 eA4 1 -- FU It s r
1 P4 1 145 1 488 1 6795-SROSI1 210-223 1 16i1 26 1
I P6 1 147 1 490 I 69523- 626 I 2I2-251 I 18 I 26 1 i V7 i ii- i -4-- i - 69A - I - 70i t 1I--7t--I-B P8 1 149 1 492 1 6851 6A64 I t- 22 2 1 27 1 1 W9 Ih 49 hfa I o-4 4e 1 1 1 el Ishylfl 1 AMCf-
1 20 I 151 I1 494 1 6979- 6A99 I 41 56 1 4 1 P7 I al9 i m u Ift mn89si-qn-r 10je 1
B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
I IRS 1 -96-j----i9O7---fii 1 71 A f ft1 7 1 I P I 154s I 497 I A921- 6934 I 89- 98 7 I 27 I
I 1I 166 499 g 4949- 6q62 I 11 -P6 1 9 1 P7 I
I I 1f tIuu 1 A I hb97 I 17lA3 I 10 I 2 I s 0 I 1i4f-13 1 11 1 27 1I I I Sol i A976- 6eq8
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LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
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LS-2 B-14
LANOSAT-9
AU a1976
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LS-2B17
LANDSA- P
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--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
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---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
LANOSAT- I
TABLE OF CONTENTS
Section Page
INTRODUCTION vii
APPENDIX A - LANDSAT-1 ANOMALY LIST A-i
APPENDIX B - LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES B-i
APPENDIX C - LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD C-I
1 SUMMARY - LANDSAT-1 OPERATIONS 1-1
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i 11-1
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-1
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VIDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
LS-1 iii
LIST OF ILLUSTRATIONS
PageFigure
Effect of Orbit Adjusts on Landsat-1 Ground Track 2-32-1 2-2 Local Mean Time of Descending Node 2-4
3-1 Midday Solar Array Current 3-2
3-2 IA (Midday) Degradation vs Days 3-3
3-3 Actual P3and y (Paddle) Sun Angles Landsat-1 3-4
3-4 Predicted Beta Angles Landsat 1 and 2 1976 and 1977 3-5
4-14-1 Landsat-1 Freon History Orbits 14263 (5-12-75) to 17868 (1-25-76) 4-2 Landsat-1 Remaining Freon Life vs Gating Frequency 4-2
4-3 Landsat-1 Pressure - Roll Gate Prediction 4-2
5-1 Landsat-1 Spacecraft Clock Drift History 5-2
5-2 Landsat-1 Spacecraft Drift and Drift Rate 5-3
9-1 USB Power Output History (Landsat-1) 9-2
9-2 USB (Link 4) AGC Readings at Goldstone with30 Antenna Landsat-1 9-2
11-1 Landsat-1 Sensory Ring Thermal Profile 11-6
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1 13-1
17-1 Computer Map of MSS Scenes This Period - Landsat-1 17-3
17-2 Computer Map of MSS Scenes For First 3 Years Operation - Landsat-1 17-5
17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1 17-7
LS-1 iv
LIST OF TABLES
Table Page
1-1 In Orbit Payload System Performance Launch Thn Orbit 17804 (12176) Landsat-1 1-2
2-1 Landsat-1 Brouwer Mean Orbital Parameters 2-2
3-1 Landsat-1 Major Power Subsystem Parameters 3-7 3-2 Landsat-l Power Subsystem Analog Telemetry (Average Value for Data
Received in NBTR Playback) 3-9
4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary 4-3 4-2 Landsat-1 ACS Voltages and Currents 4-4 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles 4-4
5-1 Landsat-1 Command Clock Telemetry Summary 5-4
6-1 TLM Telemetry Summary 6-1
7-1 Landsat-1 Orbit Adjust Summary 7-1 7-2 Landsat-1 OAS Telemetry Values 7-2
8-1 iMCA Telemetry Summary (Landsat-1) 8-1
9-1 Landsat-i USBPMP Telemetry Values 9-1
10-1 Landsat-1 APU Telemetry Functions 10-1
11-1 Landsat-1 Thermal Subsystem Analog Telemetry (Average Value of Frames for Data Received in NBTR Playback) 11-3
11-2 Landsat-i Compensation Load History 11-5
12-1 NBR Operating Hours by Modes Landsat-1 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1 12-1
13-1 Wideband Modulator Telemetry Values Landsat-l1 13-2
14-1 Landsat-1 AMS Temperature Telemetry 14-1
15-1 WBVTR3-l Telemetry Values 15-1
17-1 MSS Telemetry Values 17-1 17-2 MSS Response History Landsat-1 17-10
LS-1 vvi
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
lb 349 1 1240 1I7282-1794 1 99-111 i 8 1 amp9 1
16 350 I 1241 1 17295-17308 1j-125 9 amp9 3 1I 124 2 1 17309-17322 1 126-139 10 1 amp9
I 352 I 1243 I7323-1733b 1 140-153 11 1 9 1
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B-is LS-1
----------------------
--------------------------------------------------
-----------------------------------------------------------------
GMT I FI IGHT I SPACECRAFT I NEFFRENCE I REF I CYrLE I I DATF I DAY I DAY I 8_RITS I 8R-BITS I QAyI_- shy
-L _I I I 3Q6LL I__f____t 7 2r217 8 5 1i 71 __4 -__ -__ I7
I P 1 307 I 1563 1 21786-21799 I 85 98 I 7 7 I -vL 3 L23-08 L_1-5 6 4_L 2_1800-2112_L___9-111 J -_
I 4 1 30 I 1b5 I 21813-21626 I 112-125 I 9 I 7I I 5 I 31_L1827-21A40 1 126-139 1 10
I 6 1 311 1 1567 I 21841-21854 I 140-153 I 11 I a7 I I 7 1 12 1 b J 2 -18521968[ -167--- L 12 I ___7 I5415 --I 11 313 15b9 1869-21AR2 I 16R8181 1 13 1 u7 I W t5t 1 70 1 2188 3-2 L_ -14 i7_j596-1-182_1 -2 I 10 I 315 1 1571 1 21897-21910 I 196-209 I 15 I w7 I
-1 L1 I 316 t__72_J__21911-2192 1_21r2P3 - l I __s7 I-I 12 [ 317 1573 I 21925-21938 I 224-237 I 17 I a7 I 1j1 3_ SL _7m_-l__21239-219gb2 1_ 2_- 5 __L___8 j 1 14 I 319 1575 I 21953-21H66 I 1- 14 1 I1 8
_21 9 6 7 __-L _20- 1_57 _ 2 19R0 1 15 - ns I 1h-I 177 I 3
JL M - _ 28 2 i -- 1 321 15 i 21981-21994 29- 42 i I R8
I 17 I 322 L 8 -L 2199b-22a08 L 43- 56 x8 1 18 I 328 1579 I 22009-22022 I 57- 70 I 5 as 1 19 I 324 I i580 _L22023-2o36 1 71- 4 fL b _L 1 20 1 321 1581 I 22037-2 050 I 8S- 98 I 7 1 28 I 1 21 1 326 -L i52_ 22051-2206jZ j_3_-11 i8_ I p I P I 327 -1 583 1 22064-22077 ( 112-125 I 9 1 I-I 23I 328 I 1584 I 22078-2_209 Lj2A- 39 10_j2I R8 I I 24 1 329 1585 I 2209P-22105 I 140-153 I 11 I a8 I
1 26 1 331 1 i587 I 2212U-22133 I 168-181 I 13 1 a8 1 27 1 332 L 568 I 22134-22147 18_-195j_14 _ I PS 1 333 1 689-1 2214-8-22161 I 196-209 I 15 I 8 1 29 I 339 1 1590 I 22162-22175 I 210-223_--- -16 1 8__I I 30 1 335 I 1591 I 22176-22189 I 224-237 I 17 1 as
LS-1 B-19
_ _ _ _I-___T -_
DEL 1973Z6
I I GMT I FIIUHT I SPACECRAFT I REFERENCE I REF I CYrLE i I DATF I DAY I DAY I SRIlTSj fRBITsIAY _
1 1 33 1 i592 1 22190-e2203 1239-251 118 1 8-j I 2 I 337 I 1593 I 2220-22217 I 1- 14 I 1 r I
15941 3 1 338_1 122216-222 3 1 -IS- 28- L~ A~ 1 I 339 1-595 j 22232-22P45 29- 42 I 3 I I
S 340 1 596 1 2224h-22259 1 3- 56 1 4 1I L_ I h 341 I 597- Fa2260-22273 I b7- 70 1 5 1
1 7 1 342 1__j5 9 8 1 2P274-22287 71- 84 1 6 1 9 i343 1 99 I 228-2231 I 89- 98 7 1 - 9 I
1 9 1 344 1 1600 I 22302-22314i 99-111 8 R9 10 13 I 22315-22328 112-125 9 sZ9t601 1 1 1 11 1 346 1 1602 1 22329-22342 1 126-139 1 10 1 12 347 I 22432235b i q3-153 i11 a160 3 i
I 13 1 348 I 1604 I 22357-22370 154-167 1 12 1 k9 I I14 I 4IIlamp 23123I163-18 1 13 1 P9 1
1 15 1 350 1_60 6 1 22385-22398 1j18P-195 1 14 R9 16 1 351 1 1607-I 22399-2212I 196-209 15 17 1 352 I 1608 I 2P413-22426 1 210-223 1 16 Z9 a18 ~3I~ I1609 2-4-D 2 -4oI 47 p17I 19 354 I 1610 22441-22454 1 238-251 1 18 1 s9
I-1 0 I135b 1611 I 224b b-224 68 I 1- 14 1 1 1 o 1 21 1 356 1612 I 22469-22482 ( 15- 28 1 2 1 00 I22 I b3 I2243-22496 29- 42 3 1 0 I-I 3 358 1 614 I 22497-22510 1 43- 56 1 4 no
2 1615 1 22511-225241 57- 70 1 5 a nO 124 IPS 360 i616 1 22525-22538 71- 841 6_ OI I2h 361 i61T - 1 22534-22552 85- 98 7 0 I
27 I 362 11618 22553-22565 1 99-111 I 8 oO I 1 28$ 6i -1i 61-9 1 256C-22579 1I ju25-- I9--l 0o
29 36 1620 1 2580-22593 I 12 6 -13 9_j 10 1 0 I 30 3 b I b21 22b94-226 If 4j- jS3 Ill I 0 I 31 1 366 1 1622 I 22608-22621 154-167 I 12 I 0
B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
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--LUANO T-0
DELP 197
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LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
TABLE OF CONTENTS
Section Page
INTRODUCTION vii
APPENDIX A - LANDSAT-1 ANOMALY LIST A-i
APPENDIX B - LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES B-i
APPENDIX C - LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD C-I
1 SUMMARY - LANDSAT-1 OPERATIONS 1-1
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i 11-1
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-1
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VIDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
LS-1 iii
LIST OF ILLUSTRATIONS
PageFigure
Effect of Orbit Adjusts on Landsat-1 Ground Track 2-32-1 2-2 Local Mean Time of Descending Node 2-4
3-1 Midday Solar Array Current 3-2
3-2 IA (Midday) Degradation vs Days 3-3
3-3 Actual P3and y (Paddle) Sun Angles Landsat-1 3-4
3-4 Predicted Beta Angles Landsat 1 and 2 1976 and 1977 3-5
4-14-1 Landsat-1 Freon History Orbits 14263 (5-12-75) to 17868 (1-25-76) 4-2 Landsat-1 Remaining Freon Life vs Gating Frequency 4-2
4-3 Landsat-1 Pressure - Roll Gate Prediction 4-2
5-1 Landsat-1 Spacecraft Clock Drift History 5-2
5-2 Landsat-1 Spacecraft Drift and Drift Rate 5-3
9-1 USB Power Output History (Landsat-1) 9-2
9-2 USB (Link 4) AGC Readings at Goldstone with30 Antenna Landsat-1 9-2
11-1 Landsat-1 Sensory Ring Thermal Profile 11-6
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1 13-1
17-1 Computer Map of MSS Scenes This Period - Landsat-1 17-3
17-2 Computer Map of MSS Scenes For First 3 Years Operation - Landsat-1 17-5
17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1 17-7
LS-1 iv
LIST OF TABLES
Table Page
1-1 In Orbit Payload System Performance Launch Thn Orbit 17804 (12176) Landsat-1 1-2
2-1 Landsat-1 Brouwer Mean Orbital Parameters 2-2
3-1 Landsat-1 Major Power Subsystem Parameters 3-7 3-2 Landsat-l Power Subsystem Analog Telemetry (Average Value for Data
Received in NBTR Playback) 3-9
4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary 4-3 4-2 Landsat-1 ACS Voltages and Currents 4-4 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles 4-4
5-1 Landsat-1 Command Clock Telemetry Summary 5-4
6-1 TLM Telemetry Summary 6-1
7-1 Landsat-1 Orbit Adjust Summary 7-1 7-2 Landsat-1 OAS Telemetry Values 7-2
8-1 iMCA Telemetry Summary (Landsat-1) 8-1
9-1 Landsat-i USBPMP Telemetry Values 9-1
10-1 Landsat-1 APU Telemetry Functions 10-1
11-1 Landsat-1 Thermal Subsystem Analog Telemetry (Average Value of Frames for Data Received in NBTR Playback) 11-3
11-2 Landsat-i Compensation Load History 11-5
12-1 NBR Operating Hours by Modes Landsat-1 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1 12-1
13-1 Wideband Modulator Telemetry Values Landsat-l1 13-2
14-1 Landsat-1 AMS Temperature Telemetry 14-1
15-1 WBVTR3-l Telemetry Values 15-1
17-1 MSS Telemetry Values 17-1 17-2 MSS Response History Landsat-1 17-10
LS-1 vvi
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
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LS-i B-15
AUGS976
---------------shy__ ___ ___ - M_ -- -- -- __ -- -- -- - - -- - -
AI I GMT I FI IUHT I SPACECRAFT I NEFERENCE I REF CYrLE I DATF DAY I DAY I GRBITS I 6RBITS I DAY I k I
------------------- ------------------ ----shy t---------------------I I PI14 I 1470 1 20489-20502 I 4q- 56 I 4 1 2 1 I 2 1 215 I 1471 I 20503-051b I 57- 70 I 5 1 R2 I I 1i216 1 1472 1L 205 17shy 2 0530 _I I-_ 84 L 2j I 4 I P17 I 1473 I 20531-20E44 I 85- 98 1 7 r 2
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I I GMT I Fl IbHT I SPACECRAFT I REFERENCE I REF I CYrLE l I DATF I DAY I DAY i QRe S I e S-T_JoDAY IN _
1 I77 I 10-153 i5531 21339-21q52 1
1 2 I 276 1 1532 1 21353-21366 1 154-167 1 12 1 5 I I 3 I 277 I 1533 I 21367-21380 I 16R-181 1 13 1 5 _ I I 27g 53 I 2135T 213-9 182-195 14 k5 I 1 P79 1 1535 1 21395-21408 I 196-209 15 1_S
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I 26 30 I 2I6Sa2i~b 1 R8i
B-is LS-1
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GMT I FI IGHT I SPACECRAFT I NEFFRENCE I REF I CYrLE I I DATF I DAY I DAY I 8_RITS I 8R-BITS I QAyI_- shy
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LS-1 B-19
_ _ _ _I-___T -_
DEL 1973Z6
I I GMT I FIIUHT I SPACECRAFT I REFERENCE I REF I CYrLE i I DATF I DAY I DAY I SRIlTSj fRBITsIAY _
1 1 33 1 i592 1 22190-e2203 1239-251 118 1 8-j I 2 I 337 I 1593 I 2220-22217 I 1- 14 I 1 r I
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S 340 1 596 1 2224h-22259 1 3- 56 1 4 1I L_ I h 341 I 597- Fa2260-22273 I b7- 70 1 5 1
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1 9 1 344 1 1600 I 22302-22314i 99-111 8 R9 10 13 I 22315-22328 112-125 9 sZ9t601 1 1 1 11 1 346 1 1602 1 22329-22342 1 126-139 1 10 1 12 347 I 22432235b i q3-153 i11 a160 3 i
I 13 1 348 I 1604 I 22357-22370 154-167 1 12 1 k9 I I14 I 4IIlamp 23123I163-18 1 13 1 P9 1
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B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
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NOV 970
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B-6 IS-2
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Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
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t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
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LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
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LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
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LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
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LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
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LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
I UiTr I UAT I UAY I I N Iq---T-Ar -WT
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AU a1976
I I G lT I i UIHT SPACECRAFT I REFFRENCr I REF CYCLE I
I UNIF I A I I 777 I7I I Qwtsi is I 1XT I NO0 I
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LANDSAThP
flCTs 1976
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26 12300 1 643 1 A9S7- Rq70 I 11112P6 1 9 1 35 1
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I2 1 304o1 647 1 qoip- 9nPSI 1681A1 I plusmn3 351
LS-2B17
LANDSA- P
NOV 1970
I I 6MlT I Fi IbHPT I qRACECRAFT I REFIrKNtE I REF c YcL I
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t PP 3P7 1 670 I q333- 9146 1 2--St I Is 36 I I es 1 3i 1 bt I 43a4- 9 74 I 1 1- I 1 1 5 I 1 4 1 3P9 I 672 1 9S- 9q74 I 1 2R I 2 37 1
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I no I 3a5 I 678 I Q445- 9u - I I I T
RFPRODUWITYM OF THM LS-2ORIGMNAL PAGE FP001h B-18
--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
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---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
LIST OF ILLUSTRATIONS
PageFigure
Effect of Orbit Adjusts on Landsat-1 Ground Track 2-32-1 2-2 Local Mean Time of Descending Node 2-4
3-1 Midday Solar Array Current 3-2
3-2 IA (Midday) Degradation vs Days 3-3
3-3 Actual P3and y (Paddle) Sun Angles Landsat-1 3-4
3-4 Predicted Beta Angles Landsat 1 and 2 1976 and 1977 3-5
4-14-1 Landsat-1 Freon History Orbits 14263 (5-12-75) to 17868 (1-25-76) 4-2 Landsat-1 Remaining Freon Life vs Gating Frequency 4-2
4-3 Landsat-1 Pressure - Roll Gate Prediction 4-2
5-1 Landsat-1 Spacecraft Clock Drift History 5-2
5-2 Landsat-1 Spacecraft Drift and Drift Rate 5-3
9-1 USB Power Output History (Landsat-1) 9-2
9-2 USB (Link 4) AGC Readings at Goldstone with30 Antenna Landsat-1 9-2
11-1 Landsat-1 Sensory Ring Thermal Profile 11-6
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1 13-1
17-1 Computer Map of MSS Scenes This Period - Landsat-1 17-3
17-2 Computer Map of MSS Scenes For First 3 Years Operation - Landsat-1 17-5
17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1 17-7
LS-1 iv
LIST OF TABLES
Table Page
1-1 In Orbit Payload System Performance Launch Thn Orbit 17804 (12176) Landsat-1 1-2
2-1 Landsat-1 Brouwer Mean Orbital Parameters 2-2
3-1 Landsat-1 Major Power Subsystem Parameters 3-7 3-2 Landsat-l Power Subsystem Analog Telemetry (Average Value for Data
Received in NBTR Playback) 3-9
4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary 4-3 4-2 Landsat-1 ACS Voltages and Currents 4-4 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles 4-4
5-1 Landsat-1 Command Clock Telemetry Summary 5-4
6-1 TLM Telemetry Summary 6-1
7-1 Landsat-1 Orbit Adjust Summary 7-1 7-2 Landsat-1 OAS Telemetry Values 7-2
8-1 iMCA Telemetry Summary (Landsat-1) 8-1
9-1 Landsat-i USBPMP Telemetry Values 9-1
10-1 Landsat-1 APU Telemetry Functions 10-1
11-1 Landsat-1 Thermal Subsystem Analog Telemetry (Average Value of Frames for Data Received in NBTR Playback) 11-3
11-2 Landsat-i Compensation Load History 11-5
12-1 NBR Operating Hours by Modes Landsat-1 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1 12-1
13-1 Wideband Modulator Telemetry Values Landsat-l1 13-2
14-1 Landsat-1 AMS Temperature Telemetry 14-1
15-1 WBVTR3-l Telemetry Values 15-1
17-1 MSS Telemetry Values 17-1 17-2 MSS Response History Landsat-1 17-10
LS-1 vvi
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
lb 349 1 1240 1I7282-1794 1 99-111 i 8 1 amp9 1
16 350 I 1241 1 17295-17308 1j-125 9 amp9 3 1I 124 2 1 17309-17322 1 126-139 10 1 amp9
I 352 I 1243 I7323-1733b 1 140-153 11 1 9 1
I 35a I 2 17337-17350 1 154-167 12 1 9
20 I3511 245 17351-17364 1 16R-181 13 1 9 1 21 I 355 I 124 I 1736b-17378 I 182-195 14 1 9 I
22 356 I i 1 I 17379-17392 I 196-209 15 1 pound9 1shy
124 823 357 1 17393-174o06 210-223 i lb 1 9
24 358 124 5 1 17407-17420 I 224-237 1 17 A9 1 25 359 150 17421-17434 1 238-251 18 i 9
26 360 2n 1174 I 1 70I II 44s T--14 11 1 1 1- 28 2 p 70 I
1252 17449-1746227 361 28 362 1253 17463-17476 1 - +2 1 - 3 -1 70 P9 363 1 1254 1 17477-17490 1 43 56 1 4 1 0 1
3c) 364 I255 17491-17504 I1 57- 70 1 5 1 70 31 365 1 1256 1 17505-17518 1 71- 84 j 6 1 70 1
------------------------------------------- ---------------------shy
LS-1 B-8
________
_ _ ---------------------------------------------------------------
LANDSAT-1 ________JANt976 _ _ _ _ _
I I GMT I FIIUHT I SPACECRAFT I NEFERENCE I REF I CYrLE I
i Dllil iL I 1S tbI tljlAlLJlt ItitL
1 1 1 - 1 - - 17519-17S32 1 S- 98 -7_- 70 1 2 1 2 I 12bg I 17533-17545 I 99-111 8 I 70 1
3_l__A25 9__ 1754b-17559j11125 -9 1 ---70 1 4 1 4 1 1260 I 17560-17573 I 126-139 I 10 I 70 _ L 5J_2 L 1L17 5 74-17587 1A0o 15$___ L_0 shy
6 I 6 12b2 I 17586-17601 1 154-167 i 12 i 70 1
_j_ 7 _I _7 I1A23 I 17632-17615 1 __168-181_ _I _13 1_ 70 I b 8 I 1264 I 1761b-17629 I 18-195 I 14 I 70 1 I 9 j 9 I i2t5 J 17630-7h43 _L 196-2Q9 1-5 t270 I I 10 I 0 I 1266 I 17644-17657 1 210-223 I 16 I 70 11 1l 26f__J17656-17671 __224-237 _ 0I__i J_ 17 1
I1P 12 I 1268 I 17672-17685 238-251 1 18 I 70 13 iJ 13 -L-- 1269 I 1768b17699 L-- 11LJ jI1L_
I 4 14 I 1270 I 1770u-17713 1 15-28 1 2 I 71 I 1I1271 j__17714-17727 j _ _29- 42 1_ 3 I 71 i
lb I 16 I 1272 I 17728-17741 1 43- 56 I 4 1 71 I
J 1 -A7_ j1 A7 _5h1 1kL_177 4i -17755fi_57- 70 I
1 1 1 1274 1 1775-17769 71- 84 1 6 I 71 I 1j 19 1-- 7 77 - 77 85 8 98-- I7- 7_i 1
I 20 I 20 1 276 I 17784-17796 I 99-111 I I 71 1 1 21 I21_j_ 277 LI 7797-178_1_110 _-125_ _91 1 2 I 22 I 1278 I 17811-17824 I 126-139 I 10 I 71
9 53I P3 I 23 1 iP7 I 17825-17838 I 4p_1 L_ 2171 I 24 I 24 I 126O I 17839-17952 I 54-167 I 12 I 71 I L t1 25LW2amp1 L1753-178 6_ 16-181L l3 7_1 _L
2b I 26 I 1282 I 17867-17A80 I 182-195 I 14 1 71 I 8j2j7 2 _L1283___L_17 1-17A94_A_196_209 __ 15 - 71 [
I 29 I 28 8 I 17895-17908 1 210-223 I 16 1 71 I
9 1 85 17909-1792__ 224-237 i17_ I 30 1 30 I 1286 I 17923-17936 I 238-251 I lb I 71 I I 31 I 31 I 12t7 I 17937-17950 I 1 14- 1 _ _
LS-1 shy
--------- --- ------------- --------- -- --- ---
----- - - ----------------------
rES6i 976
I REFI CYrLE IGMT I Fl IGHT I SPACECRAFT I REFERENCE I DATF I DAY I nAY I ORBITS I ORBITSiDAY _ N I
---------------------w------------------- --------------shy1 1 I i 88L1179~II964LLI IS-2 8 I L1 2
i28 9 3 1 72 I2 33 1 1 1796b-17978 1 29- 42 I It3 34_ S290_j_ --7979I --- 56 122 _I__ 5 [4 j1
4 I 35 I i29 1 I 17993-1800b I 57- 70 5 I 72 1
S5 I 36 I Q22 1 18007-18020 I 71- 8 b 72 I
6 37 I 1293 I 18021-18034 85 98 j 7 I 72 I
3 I294 18035-180 4 7 I 99-11 I 8-1 72 1
h I jI 12 9 5 i18046-18061 112-125 I 9 72 1I 1 i I 72 I_
9 40 1 1296 1 18062-18o75-I 126-139 I)0 I III 1807b-18089 I 140-o3 I 11 1 7e I
42 1 iP98 18090-18103 154-167_ 1 1 7 L11 I 129 9 1 18104-18117 1 168-181 1 13 1 722 I3 112 4z __ Lj i 4 4_L 1300 _2L-8 I8P-195 __
14 I 1 i301 1 18132-18145 1 196-209 1 15 1 2 I I 46 1 302 I 1814t-18159 1 21o-223 1 16 72 _
t6 I jslS16o-18173 224-237 1 17 72 I
17 48 1 1304 I 18174-18187 1 238-251 1 18 1 72 I 1- 14 1 1 1 73 118 49 I 1305 I 18186-18201 I
9 - 50 1 1306 I 18202-18215 1 i5- 28 a P I 73 I
20 I 10 181- -5 1 29- 42 1 1i I 1 a52 I 308 1 18230-18243 43- 56 1 4 73
22 53 130o0 Ia 82J44-1S2574- 70 3
I a 1310 I 18258-18271 1 7 8 123 54 - 9 13-shy24 I 5I i1 I 1fKu-1babbf I
I5 Sb I 312 1828b-18298 I 99-111 1 1 73
25 55 I T 8 T~ T j~ F - C9 i I3 27 I 58 I 1314 I 18313-18326 I 126-139 1 10 I 73 I I8 I I j3j8--4o--7-0 I 14o-16 3 11 1 shy
j 73 Ip9 I 60 I J316 I 18341-18354 I 154-167 -12
B-10bshy
-----------------------------------------------------------------
------------------------------------------------------
I I GMT I Fl IGHT I SPACECRAFT I REFFRENCE I REF I CYrLF I I DATF I DAY I DAY ji___a ITs I ORBITS-- I -DAY-J-WN _ _
I I I 61 I 17 __83518368LA68161 1- 13 1 73 1 I P I 62 I 1318 I 18369-18382 1 18-195 I 14 I 73 I L 31 63 319--l--18383-18-396__I---1-96209 I 15 I _ _-73 _ 1- I I 64 1 1320 1 18337-18410 1 210-223 I lb I 73 I 1 5 I 65 I 132LtA841l-42- -- 2-23l- - 7tL
1 6 I 66 1 1322 1842S-1843d 1 238-251 I 18 I 73 I
7 1_67 rt323 1 _184 39-18452_ 14__ I - 74 --1 1 6 1 68 1324 I 16453-18466 I 1S- 28 i 2 I 74 I
1 9 I 69 I 1325 jAi8467-188_0 29-1 42 3 J - 4 L I 10 1 70 1 1326 118481-18494 I 43- 56 I 4 1 74 I
11 L-71 J -32 7-_j__l8495-1850 8- 157- 70 _I__ 5 I -74_L I 12 72 132 8 118509-18522 1 71- 84 1 6 I 74 I
13 L_ I 83sect 8 59_8J 1_731_32 L8523-I 14 I 74 1 1330 I 18537-18549 1 99-111 I 8 I -4 I
5 5 0-1 8 5 6 3 _ IL__ I- -331 ]_18 1I11-125 I 9 I 74 I 16 I 76 1 j332 I IgS64-18E77 1 126-139 I 10 I 74 I
I 17 I 77 I -j333j15857-1591-- 4013 1t1-1 I 18 I 78 1 1334 1 18532-18h05 I 154-167 I 12 I 74 I
1 -9 I 79 L_335_j18606-1869tLA-68-1amp_ L-13 7L4zl I 20 I 60 I 1336 I 18620-18633 I 18-195 I 1+ I 74 I 1 Pi1 81 I 1 7 l 63 8L7 I L09 _1 _I__ _
j 22 I 82 1 j33 8 1 18646-18661 I 21o-223 I 16 I 74 1shy
1 23 1 83 2- i4 74t-Lb7I133 I I 24 84 I 134 0 11867b-1868 9 I 238-251
7 5I 18 I 74 I ji _amp L_3t14_ J $_690L~ g691-87 3J _ _Ir__ 4 1 -- L
I 2b I 86 1 1342 18704-18717 I 15- 28 1 2 I -15 P7 I 87 I i343__j1871-18731fLi999 43_
1 28 I 88 1 1344 I 18732-18745 1 43- 56 I i 75 I 1 9 1 89 I 1345 I 18746-18759 I 57-_7 0 _j---5_j 75 shy
1 30 I 90 I 1346 1 18760-18773 I 71- 84 1 I i5 I 7I 31 I 91 1 1347 1 1877plusmn-1878 1_ _85 98 1] 7 _ 5 t_
LS-1 B-li
-------------------------------------------------------------
L S LAI -----
I I GMT I Ftl I(HT I SPACECRAFT I REFERENCE I REF I CYrLE I
IDA F D I DAY I RBITS I RITS I DAy I NA I -------------------------------- -
I 1I 92 I 1348 I 1878a-18800 I 99-111 I 8 1 7i 1 2 1 93 I 1349 I 18801-18814 11p-125 1 9 I 75 1
8 1 39S 3 I 4_1-1-50 ___ 1 8 15 18 A2 t126- 1_10uL 2 5
r 4 1 95 i 135l I 18829-18342 1 14o-153 111 75 I 6 1 9b I i3b2 I 18843-18856 14-167 1 12 I5 1 I 6 1 97 1 1353 1 18857-18870 1 168-181 1 13 I -75
9 8 7L7__1 j__354 _I 18871-18884 18P-195 1 14 I 751
I 6I 99 1355 1 1885-1s9d 1 196209 1 15 75 I 9 1 100 I 1356 1 18899-18912 1 210223 1 16 I 75 I I 10 I 101 I 357 I 18913-18926 1 224-237 17 I 75
i to I 358 i 1R927-18940 i 238251 18 I 75 1 I 12 a 10 1359 1 18941i-1954 I 11 4 I 1 I 76 1
IL 04 6A 3b r189 518968 j 128 I 2j j 14 1 JOS I i3bj1 18969-18982 29- 42 I 3 I 76 1
I 106 1 1362 I 18983-18996_1 56 L76 I 7 I o7 i 6 1 178997-19010- 57- 70 I S 16
17 1 i3t4 1 19011-19024 1 71- 8 4 6 17 6 j t I109 1H3b5 0 38 85- 98 7 118 I dI19a5-19 I I 76
I 19 I 110 1 1366___L9039 19o5l 1 99-111 I 8 76 _ I 20 1 111 I 767 I 1905-196o5 11P-5 j1 9I 7i6
1 2 6 1 21 1 112 i 1368 I 19066-19079 1 - 13 9 __Ll0 76 1 1 22 1 113 1 1369 I1gg-C-1 993 140-153 1 11 76 I0
1 23 I t14 I 1370 I 19094-19107 1 154-167 I 12 I 76 I 24 I 115 1 1371 1 19106-19121 f lb8181 I 13 76 I
25 I 116 I 372 19122-19135 1 182-195 I 14 76 I I 2b I 117 I 1373 I 19136-13149 19-09 i 15 I76
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LS-1 B-19
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B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
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LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
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B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
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LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
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B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
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t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
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B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
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LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
I A I h I u5 I h65- bAhn I II R I h I 2e I I I 67 07I 5666- 547q I Agi- 9 I 7a P2 1
0 ba I 4u IA4 8 U I ~~I
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I 12 72 4plusmn5 I 5777- 5790 I IqA-Pfq I 1 22 I 1 73 t -trr5St-WRoPAn--T-19--1 22
I 14174 1 17I qS5-Si8 I 2P4-P7 1 17 1 P2 I i i 8 5I1--q -- 1T --- t- P7 -
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B-10 LS-2
OEP PUAE OF THORMWAL PAGE IS Poop
LAN0hATP
AIfls19WJA
W W
I IGMT rI Gl(HT ISPACECRAFT I REFFRrEzCE REF CYCLE I I tJAIW I LJAJ I ~jAT I Uf~bI I I tMii urr-7yINrr-T
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LS-2 B-11
LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
P 1 193 1 466 1 A4gAshy got 1 154-167 1 12 1 25 1
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1 s a8129 I 482 1 A71P- 67P4 1 127-139 1 to i 26 1 -r-19-1-140-1--483m1W725fl--72rfllIr I Irm -r T
I 00 I 141 494 I A573q- 675 I 15IA7 I 12 I 26 1 1l I i f nrr-r-rnm-T 9f r -- TshyT-17 --
I pp I 1Ja I 496 I 5767 67A I jRj5 1 14 1 26 1 1 P I 1 47 1 781 eA4 1 -- FU It s r
1 P4 1 145 1 488 1 6795-SROSI1 210-223 1 16i1 26 1
I P6 1 147 1 490 I 69523- 626 I 2I2-251 I 18 I 26 1 i V7 i ii- i -4-- i - 69A - I - 70i t 1I--7t--I-B P8 1 149 1 492 1 6851 6A64 I t- 22 2 1 27 1 1 W9 Ih 49 hfa I o-4 4e 1 1 1 el Ishylfl 1 AMCf-
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B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
I IRS 1 -96-j----i9O7---fii 1 71 A f ft1 7 1 I P I 154s I 497 I A921- 6934 I 89- 98 7 I 27 I
I 1I 166 499 g 4949- 6q62 I 11 -P6 1 9 1 P7 I
I I 1f tIuu 1 A I hb97 I 17lA3 I 10 I 2 I s 0 I 1i4f-13 1 11 1 27 1I I I Sol i A976- 6eq8
7 i 1s1--- I r ----- I- S----qn-n-I--Rt1-i7---7i 9 I 160 1 503 I 7004- 7n17 I IAA-11 1 13 1 P7
I I Ifil I 504 I 70plusmn97fWlA I IMPa ITJ - F I la I 12 I 505 I 7039 7M45 I 19A-oq I It I P7 I 11 1J 1~ MM 10 I I I elI1U Ufilf 2IMlt2e lb IV I 164 507 I 7060- 7173 I P4l-P7 1 17 1 7 1 11 1n POS- IUf78F1S~M1 14 I 166 1 509 i 708 71 1 I 1- 4 I 1 P8In 116--1--510 1 top 1-T- -T -1- 87-fshy
1 16 1te8 1 Sit I 7116- 7129 I pq amp2 1 3 1 29 1 Iif I ISft 1 01i 1t71au 7144 1 4 flbs I 16 tFs IA I 170 I 513 I 7144 7157 I 57v 70 1 S I 8 I 111 1-t I t a1 2-1-r-Tt84r1T-l
0O 1 172 515 I 7172 71RS 1 8t 9 71 28S -l I 1 516 1 7 - rr-r rTgr--shy
jPP 11741 517 I 7200-7P13 I ti-26 1 91 281
I Pb I 176 1 19 I 7P27- 7 40 I 1n-153 1 11 I pa I
I PA I 178 1 521 I 7255- 7PAA I IAA-tIII 13 1 28 I -r--7--r-t2---t ----- 1269r7fl2 tt---182 95--T---r -- 8---tshy
na I 10 523 I 728- 7296 I 19A-P09 1 15 PS I
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LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
I UiTr I UAT I UAY I I N Iq---T-Ar -WT
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I -I JAI 531 I 7395 740A 1 57- 7n I 5 i P9IR
88 190 1 533 1 742-7416AI r 98 1 71 P9 I 7RD- ij----F r
10 192 35 1 7451- 7464 I11-t26 I 9 29 1 I S6 77-fln9T - - -
I I Iwrr- 37 sa-i----i- -shy
1 I na I 148i 171 1 10F 29 = I1 I q I 537 1 7478- 74Q1 I 14 t53 I 11 I P9 3 B 15t 3amp-7tjFlr~SfTrTamp12Fshyla a
I I 196 I 539 I 710- 7q19 I IAA-181 I 13 1 29 1 19T-t 5-0-- 1-la-FrT~rr 1amp f -r
116 1iq8 541 I 7534 7947 1 19AP09 I 15 1 P9 1 1I 1 I T93 I Sie I tflw II I cinPt7t7--r6 I f i
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LANOSAT-9
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--LUANO T-0
DELP 197
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---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
LIST OF TABLES
Table Page
1-1 In Orbit Payload System Performance Launch Thn Orbit 17804 (12176) Landsat-1 1-2
2-1 Landsat-1 Brouwer Mean Orbital Parameters 2-2
3-1 Landsat-1 Major Power Subsystem Parameters 3-7 3-2 Landsat-l Power Subsystem Analog Telemetry (Average Value for Data
Received in NBTR Playback) 3-9
4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary 4-3 4-2 Landsat-1 ACS Voltages and Currents 4-4 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles 4-4
5-1 Landsat-1 Command Clock Telemetry Summary 5-4
6-1 TLM Telemetry Summary 6-1
7-1 Landsat-1 Orbit Adjust Summary 7-1 7-2 Landsat-1 OAS Telemetry Values 7-2
8-1 iMCA Telemetry Summary (Landsat-1) 8-1
9-1 Landsat-i USBPMP Telemetry Values 9-1
10-1 Landsat-1 APU Telemetry Functions 10-1
11-1 Landsat-1 Thermal Subsystem Analog Telemetry (Average Value of Frames for Data Received in NBTR Playback) 11-3
11-2 Landsat-i Compensation Load History 11-5
12-1 NBR Operating Hours by Modes Landsat-1 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1 12-1
13-1 Wideband Modulator Telemetry Values Landsat-l1 13-2
14-1 Landsat-1 AMS Temperature Telemetry 14-1
15-1 WBVTR3-l Telemetry Values 15-1
17-1 MSS Telemetry Values 17-1 17-2 MSS Response History Landsat-1 17-10
LS-1 vvi
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
lb 349 1 1240 1I7282-1794 1 99-111 i 8 1 amp9 1
16 350 I 1241 1 17295-17308 1j-125 9 amp9 3 1I 124 2 1 17309-17322 1 126-139 10 1 amp9
I 352 I 1243 I7323-1733b 1 140-153 11 1 9 1
I 35a I 2 17337-17350 1 154-167 12 1 9
20 I3511 245 17351-17364 1 16R-181 13 1 9 1 21 I 355 I 124 I 1736b-17378 I 182-195 14 1 9 I
22 356 I i 1 I 17379-17392 I 196-209 15 1 pound9 1shy
124 823 357 1 17393-174o06 210-223 i lb 1 9
24 358 124 5 1 17407-17420 I 224-237 1 17 A9 1 25 359 150 17421-17434 1 238-251 18 i 9
26 360 2n 1174 I 1 70I II 44s T--14 11 1 1 1- 28 2 p 70 I
1252 17449-1746227 361 28 362 1253 17463-17476 1 - +2 1 - 3 -1 70 P9 363 1 1254 1 17477-17490 1 43 56 1 4 1 0 1
3c) 364 I255 17491-17504 I1 57- 70 1 5 1 70 31 365 1 1256 1 17505-17518 1 71- 84 j 6 1 70 1
------------------------------------------- ---------------------shy
LS-1 B-8
________
_ _ ---------------------------------------------------------------
LANDSAT-1 ________JANt976 _ _ _ _ _
I I GMT I FIIUHT I SPACECRAFT I NEFERENCE I REF I CYrLE I
i Dllil iL I 1S tbI tljlAlLJlt ItitL
1 1 1 - 1 - - 17519-17S32 1 S- 98 -7_- 70 1 2 1 2 I 12bg I 17533-17545 I 99-111 8 I 70 1
3_l__A25 9__ 1754b-17559j11125 -9 1 ---70 1 4 1 4 1 1260 I 17560-17573 I 126-139 I 10 I 70 _ L 5J_2 L 1L17 5 74-17587 1A0o 15$___ L_0 shy
6 I 6 12b2 I 17586-17601 1 154-167 i 12 i 70 1
_j_ 7 _I _7 I1A23 I 17632-17615 1 __168-181_ _I _13 1_ 70 I b 8 I 1264 I 1761b-17629 I 18-195 I 14 I 70 1 I 9 j 9 I i2t5 J 17630-7h43 _L 196-2Q9 1-5 t270 I I 10 I 0 I 1266 I 17644-17657 1 210-223 I 16 I 70 11 1l 26f__J17656-17671 __224-237 _ 0I__i J_ 17 1
I1P 12 I 1268 I 17672-17685 238-251 1 18 I 70 13 iJ 13 -L-- 1269 I 1768b17699 L-- 11LJ jI1L_
I 4 14 I 1270 I 1770u-17713 1 15-28 1 2 I 71 I 1I1271 j__17714-17727 j _ _29- 42 1_ 3 I 71 i
lb I 16 I 1272 I 17728-17741 1 43- 56 I 4 1 71 I
J 1 -A7_ j1 A7 _5h1 1kL_177 4i -17755fi_57- 70 I
1 1 1 1274 1 1775-17769 71- 84 1 6 I 71 I 1j 19 1-- 7 77 - 77 85 8 98-- I7- 7_i 1
I 20 I 20 1 276 I 17784-17796 I 99-111 I I 71 1 1 21 I21_j_ 277 LI 7797-178_1_110 _-125_ _91 1 2 I 22 I 1278 I 17811-17824 I 126-139 I 10 I 71
9 53I P3 I 23 1 iP7 I 17825-17838 I 4p_1 L_ 2171 I 24 I 24 I 126O I 17839-17952 I 54-167 I 12 I 71 I L t1 25LW2amp1 L1753-178 6_ 16-181L l3 7_1 _L
2b I 26 I 1282 I 17867-17A80 I 182-195 I 14 1 71 I 8j2j7 2 _L1283___L_17 1-17A94_A_196_209 __ 15 - 71 [
I 29 I 28 8 I 17895-17908 1 210-223 I 16 1 71 I
9 1 85 17909-1792__ 224-237 i17_ I 30 1 30 I 1286 I 17923-17936 I 238-251 I lb I 71 I I 31 I 31 I 12t7 I 17937-17950 I 1 14- 1 _ _
LS-1 shy
--------- --- ------------- --------- -- --- ---
----- - - ----------------------
rES6i 976
I REFI CYrLE IGMT I Fl IGHT I SPACECRAFT I REFERENCE I DATF I DAY I nAY I ORBITS I ORBITSiDAY _ N I
---------------------w------------------- --------------shy1 1 I i 88L1179~II964LLI IS-2 8 I L1 2
i28 9 3 1 72 I2 33 1 1 1796b-17978 1 29- 42 I It3 34_ S290_j_ --7979I --- 56 122 _I__ 5 [4 j1
4 I 35 I i29 1 I 17993-1800b I 57- 70 5 I 72 1
S5 I 36 I Q22 1 18007-18020 I 71- 8 b 72 I
6 37 I 1293 I 18021-18034 85 98 j 7 I 72 I
3 I294 18035-180 4 7 I 99-11 I 8-1 72 1
h I jI 12 9 5 i18046-18061 112-125 I 9 72 1I 1 i I 72 I_
9 40 1 1296 1 18062-18o75-I 126-139 I)0 I III 1807b-18089 I 140-o3 I 11 1 7e I
42 1 iP98 18090-18103 154-167_ 1 1 7 L11 I 129 9 1 18104-18117 1 168-181 1 13 1 722 I3 112 4z __ Lj i 4 4_L 1300 _2L-8 I8P-195 __
14 I 1 i301 1 18132-18145 1 196-209 1 15 1 2 I I 46 1 302 I 1814t-18159 1 21o-223 1 16 72 _
t6 I jslS16o-18173 224-237 1 17 72 I
17 48 1 1304 I 18174-18187 1 238-251 1 18 1 72 I 1- 14 1 1 1 73 118 49 I 1305 I 18186-18201 I
9 - 50 1 1306 I 18202-18215 1 i5- 28 a P I 73 I
20 I 10 181- -5 1 29- 42 1 1i I 1 a52 I 308 1 18230-18243 43- 56 1 4 73
22 53 130o0 Ia 82J44-1S2574- 70 3
I a 1310 I 18258-18271 1 7 8 123 54 - 9 13-shy24 I 5I i1 I 1fKu-1babbf I
I5 Sb I 312 1828b-18298 I 99-111 1 1 73
25 55 I T 8 T~ T j~ F - C9 i I3 27 I 58 I 1314 I 18313-18326 I 126-139 1 10 I 73 I I8 I I j3j8--4o--7-0 I 14o-16 3 11 1 shy
j 73 Ip9 I 60 I J316 I 18341-18354 I 154-167 -12
B-10bshy
-----------------------------------------------------------------
------------------------------------------------------
I I GMT I Fl IGHT I SPACECRAFT I REFFRENCE I REF I CYrLF I I DATF I DAY I DAY ji___a ITs I ORBITS-- I -DAY-J-WN _ _
I I I 61 I 17 __83518368LA68161 1- 13 1 73 1 I P I 62 I 1318 I 18369-18382 1 18-195 I 14 I 73 I L 31 63 319--l--18383-18-396__I---1-96209 I 15 I _ _-73 _ 1- I I 64 1 1320 1 18337-18410 1 210-223 I lb I 73 I 1 5 I 65 I 132LtA841l-42- -- 2-23l- - 7tL
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GMT I FI IGHT I SPACECRAFT I NEFFRENCE I REF I CYrLE I I DATF I DAY I DAY I 8_RITS I 8R-BITS I QAyI_- shy
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LS-1 B-19
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1 1 33 1 i592 1 22190-e2203 1239-251 118 1 8-j I 2 I 337 I 1593 I 2220-22217 I 1- 14 I 1 r I
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B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
VI I ai PA i 7 400 1 556A- 5581 23iM-251 I is 21 1 i 7 158I---4-t-t-51-q---- 1------ VF-l1 1
IP8I fi 402 1 r56SAA I 1- 28 1 2 1 22 1
LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
I A I h I u5 I h65- bAhn I II R I h I 2e I I I 67 07I 5666- 547q I Agi- 9 I 7a P2 1
0 ba I 4u IA4 8 U I ~~I
I 6 I 66 1 409 I q694- 6707 I 1t-1t26 9 I 22 I II FR I 4to I a 1 68 1 411 1 5721- 5714 1 14nfl15 1 11 1 P2
1 10 1 70 1 413 I q749- B762 I 16-181 1 13 P2 I i i I 7gid R763- 571 I Tx vt 5 I 1w I -e I
I 12 72 4plusmn5 I 5777- 5790 I IqA-Pfq I 1 22 I 1 73 t -trr5St-WRoPAn--T-19--1 22
I 14174 1 17I qS5-Si8 I 2P4-P7 1 17 1 P2 I i i 8 5I1--q -- 1T --- t- P7 -
I 16 76 1 419 I q83 - 5446 I 1 I1 I 23 I 1 1 1 J I1 2 1 A0 S~MU I INfl ia e i CA I 1 IS 1 78 1 421 I q861- Sg74 I q 42 1 24F 23 1 14 0 422 1 ampcm I nr --1 tsfl---qr- b I-n--I P0 I AO 4231 989- sqnP I 57- 701 5 1 3 I
I p I 2 4225 1 R917- Sqqo I 81 Ir- 7 1 23 1 ps j ms l 42 1 S3-5444 I I x 3 rIq1e
S94 I A41 427 I q945- sqSR I 111-1 6 I 9 1 P3 I I to S i tc5428 1 73 0 1 2 I9-qti
1 96 R6 I q97P- 5q85 I Ian-153 I It I P3 II 429
I P8 I AS I 42plusmn I 6000- 6013 I 16R-181 I 1 3 1 23 I v I A3 1 4 2 1 MUI19A I oi I4 1f l iA 1u iI
I t0 I 90 I 433 I 602R- 6n4 I 19AP09 I IS I P3 I 4S1 pwn 9 MLMssfrtrP283-MIS I A
B-10 LS-2
OEP PUAE OF THORMWAL PAGE IS Poop
LAN0hATP
AIfls19WJA
W W
I IGMT rI Gl(HT ISPACECRAFT I REFFRrEzCE REF CYCLE I I tJAIW I LJAJ I ~jAT I Uf~bI I I tMii urr-7yINrr-T
-----------------------------------------------------shy921-25-r--sS-6snsrr--2awPlnr1-1 1-i-23-
V I qa 36 I6070-bo0I1 21AEt I ISi1 23 1 a 1v 9 1p 4 amp l9 F T 1 jai P4
I 495g1 438 1 A099-A6111I R- 2A 1 2 24 1 5 1 461 s I Allo- S12b 1 79I - 7 6 tQ7 40 I Aip6-619q 1 1 w R6 I 4 24 1
1 i qg19 442 1 Aj46167g1 71-84 1 Aji 24 11
110 1 101 1 44 1 Ai8P 619S I 1 9 24 1Iqtt 1
112 1 10)3 1 446 1 6210- 6PP2 I127139 I 10 1 24 1 1 is I 0 1 4 7 1AI~lt-6 6
116 loft 1 448 16237- 6250 I lq4167 I lp 24 1 1 ~ ~ 0 ~-9-T-2~ ~ 19a 1 14-r- -n- I Mrt---24 1
IIamp I6107 1 450 1 6265- 6P79 I jAm195 1 14 i P4 I 1 l 11 10 1 4b I hdL4it hP3 I 19A[N9 I I1b TPWTej
IIS I I og 1 452 1 A293- 6106 1 21n-2P3 1 16 1 24 1 Itti -a3--T--R307rsi-t-1-n2flr---7 -- F--
PO I0111 1 454 1 Aq221-AibUI 21R2Pi1 I 9 1~ P4 1 Pi Ii11o 55 nSjfiS611A I - -- T -1 -P5 -
I PP 1 113 1 456 f349- 61AP I 1~- 28 I PS I I P3 -T ip 7 l i 4 1 rAda I --1 Id 3 -s I V4 I lis 1 458 1 677 6190 1 41- 56 I 4 1 P5
I P6 iW 1I 460 1 A405- 64IA I 71- R4 1 6 1 25 1
I VRgt1i11 I 462 1 6433- 6446 1 9-112 I A I P I I W I Iwo I Ib Ai -a bu i I o Ihi Ii~t I A20 1 121 I 464 1 6461- 6473 1 127-139 1 to 1 25 I
LS-2 B-11
LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
P 1 193 1 466 1 A4gAshy got 1 154-167 1 12 1 25 1
I I 1 b4 7 170I U 57 I 21RM-3 I 1 I P F 14 I 1 468I Sj6- 6r9 I jj95 I 1 41 P I
I A I
I- I 1p71 li
b 470 74
I hbriO X3-6r1 543 I AS44 - 6R7 I 21n-2P3 124tri71 73
IWF 1 T
1A t7E-T
25 L
I 1
a 9 IP 7 130 1
472 43
I 1
657P-AntSW
6qRE I 2qR-PSI I qqrF4l wWi7
IA P5 I
10 121 474 I A00- 6413 1 7- 28 1 2 26 I 11 1 4 1AI 1 1 A614- SlAFI I F9 4e 1 41 i I
I 1 13 1 476 I A 2- 6A411 4q5 I41 26 1
I 4 Is1 4784 765- 6A69 1 71-84 1 6 l 261
I 16 1 137 1 480 I 6694- 6A97 I QQ-_p I A 1 P6 1 1 1 1 i - 7 1 1I1h ii -1 12 1 -T - - - -F--
1 s a8129 I 482 1 A71P- 67P4 1 127-139 1 to i 26 1 -r-19-1-140-1--483m1W725fl--72rfllIr I Irm -r T
I 00 I 141 494 I A573q- 675 I 15IA7 I 12 I 26 1 1l I i f nrr-r-rnm-T 9f r -- TshyT-17 --
I pp I 1Ja I 496 I 5767 67A I jRj5 1 14 1 26 1 1 P I 1 47 1 781 eA4 1 -- FU It s r
1 P4 1 145 1 488 1 6795-SROSI1 210-223 1 16i1 26 1
I P6 1 147 1 490 I 69523- 626 I 2I2-251 I 18 I 26 1 i V7 i ii- i -4-- i - 69A - I - 70i t 1I--7t--I-B P8 1 149 1 492 1 6851 6A64 I t- 22 2 1 27 1 1 W9 Ih 49 hfa I o-4 4e 1 1 1 el Ishylfl 1 AMCf-
1 20 I 151 I1 494 1 6979- 6A99 I 41 56 1 4 1 P7 I al9 i m u Ift mn89si-qn-r 10je 1
B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
I IRS 1 -96-j----i9O7---fii 1 71 A f ft1 7 1 I P I 154s I 497 I A921- 6934 I 89- 98 7 I 27 I
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LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
I UiTr I UAT I UAY I I N Iq---T-Ar -WT
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LS-2 B-14
LANOSAT-9
AU a1976
I I G lT I i UIHT SPACECRAFT I REFFRENCr I REF CYCLE I
I UNIF I A I I 777 I7I I Qwtsi is I 1XT I NO0 I
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S-2 B-15
--
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LshyB-16
- -
-------------------------------------------------------
LANDSAThP
flCTs 1976
I MT i F IGHT I SaACECRAFT I REFFPFNCE I REF I CYCLE I T I fr---Ishy--1 I pNs I5 DAY 5 ep Lib U
3 I2 276 I 619 1 622- SA3 pq 42 I
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I 16 1 W30 I 633 I RI7- 88A0 I 2P4P37 1 17 1 34 1
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I 90 1 294 1 637 1 A873- SARA I 9qe42 I S 3 51as1
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LS-2B17
LANDSA- P
NOV 1970
I I 6MlT I Fi IbHPT I qRACECRAFT I REFIrKNtE I REF c YcL I
I UAIF I UAY I UAY I 5NffTW-7 BRffWTTS I UAY I N8I-
I I I ADD lgCm I t I I 307 t 650 I qoS- 9n67 I InP23 I 16I 35 I
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t PP 3P7 1 670 I q333- 9146 1 2--St I Is 36 I I es 1 3i 1 bt I 43a4- 9 74 I 1 1- I 1 1 5 I 1 4 1 3P9 I 672 1 9S- 9q74 I 1 2R I 2 37 1
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I 98 I 333 I 676 I 9417- 9430 I 71 h4 1 6 1 27 I
I no I 3a5 I 678 I Q445- 9u - I I I T
RFPRODUWITYM OF THM LS-2ORIGMNAL PAGE FP001h B-18
--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
I I I SAO I 7-69 jn4499 94u I 11T-6-r- 1 i741-T7A I P I 227 I 680 I q4195 1 jP7139 I 10 I 37 I
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p1 30 ~ TT971-----ffltt---l--t2---3-Ishy90I 1 2 702 I q779- 97qP I t8P1Q5 i t 28 1
I P6 1 361 1 704 I 9807- 9AR0 I 21n-223 1 16 I 38 I 1 l 31 1 705 1q i - Fws -2fli4 2a- -r -t7mf-m
I 78 1 363 I 706 I 9835- QR4A I anSPst I Is I 38 I
1 20 1365 1 708 1 q863- 9a7amp I 1R- 28 1 21 39 1
---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
INTRODUCTION
This is the fifteenth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-1 Spacecraft
72SD4255
72SD4262
728D4224
73SD4249
738D4260
73SD4274
748D4205
748D4217
74SD4236
74SD4255
75SDS4222
75SDS4228
758DS4255
758DP4266
ERTS-1 Launch and Flight Activation Evaluation Report 23 to 26 July 1972 ERTS-1 Flight Evaluation Report 23 July 1972 to 23 October 1972
ERTS-1 Flight Evaluation Report 23 October 1972 to 23 January 1973
ERTS-1 Flight Evaluation Report 23 January 1973 to 23 April 1973
ERTS-1 Flight Evaluation Report 23 April 1973 to 23 July 1973
ERTS-1 Flight Evaluation Report 23 July 1973 to October 1973
ERTS-1 Flight Evaluation Report 23 October 1973 to 23 January 1974
ERTS-1 Flight Evaluation Report 23 January 1974 to 23 April 1974
ERTS-1 Flight Evaluation Report 23 April 1974 to 23 July 1974
ERTS-1 Flight Evaluation Report 23 July 1974 to 23 October 1974
Landsat-1 Flight Evaluation Report 23 October 1974 to 23 January 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 January 1975 to 23 April 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 April 1975 to 23 July 1975
Landsat-1 and Landsat-2 Flight Eval-uation Report 23 July 1975 to 23 October 1975
Previously issued documents are
18 October 1972
28 November 1972
27 February 1973
29 May 1973
10 August 1973
28 November 1973
26 February 1974
18 May 1974
15 August 1974
31 December 1974
30 April 1975
15 August 1975
10 October 1975
1 December 1975
This report contains analysis of performance for Orbits 16550 to 17830 for Landsat-1
LS-1 ViiViii
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
lb 349 1 1240 1I7282-1794 1 99-111 i 8 1 amp9 1
16 350 I 1241 1 17295-17308 1j-125 9 amp9 3 1I 124 2 1 17309-17322 1 126-139 10 1 amp9
I 352 I 1243 I7323-1733b 1 140-153 11 1 9 1
I 35a I 2 17337-17350 1 154-167 12 1 9
20 I3511 245 17351-17364 1 16R-181 13 1 9 1 21 I 355 I 124 I 1736b-17378 I 182-195 14 1 9 I
22 356 I i 1 I 17379-17392 I 196-209 15 1 pound9 1shy
124 823 357 1 17393-174o06 210-223 i lb 1 9
24 358 124 5 1 17407-17420 I 224-237 1 17 A9 1 25 359 150 17421-17434 1 238-251 18 i 9
26 360 2n 1174 I 1 70I II 44s T--14 11 1 1 1- 28 2 p 70 I
1252 17449-1746227 361 28 362 1253 17463-17476 1 - +2 1 - 3 -1 70 P9 363 1 1254 1 17477-17490 1 43 56 1 4 1 0 1
3c) 364 I255 17491-17504 I1 57- 70 1 5 1 70 31 365 1 1256 1 17505-17518 1 71- 84 j 6 1 70 1
------------------------------------------- ---------------------shy
LS-1 B-8
________
_ _ ---------------------------------------------------------------
LANDSAT-1 ________JANt976 _ _ _ _ _
I I GMT I FIIUHT I SPACECRAFT I NEFERENCE I REF I CYrLE I
i Dllil iL I 1S tbI tljlAlLJlt ItitL
1 1 1 - 1 - - 17519-17S32 1 S- 98 -7_- 70 1 2 1 2 I 12bg I 17533-17545 I 99-111 8 I 70 1
3_l__A25 9__ 1754b-17559j11125 -9 1 ---70 1 4 1 4 1 1260 I 17560-17573 I 126-139 I 10 I 70 _ L 5J_2 L 1L17 5 74-17587 1A0o 15$___ L_0 shy
6 I 6 12b2 I 17586-17601 1 154-167 i 12 i 70 1
_j_ 7 _I _7 I1A23 I 17632-17615 1 __168-181_ _I _13 1_ 70 I b 8 I 1264 I 1761b-17629 I 18-195 I 14 I 70 1 I 9 j 9 I i2t5 J 17630-7h43 _L 196-2Q9 1-5 t270 I I 10 I 0 I 1266 I 17644-17657 1 210-223 I 16 I 70 11 1l 26f__J17656-17671 __224-237 _ 0I__i J_ 17 1
I1P 12 I 1268 I 17672-17685 238-251 1 18 I 70 13 iJ 13 -L-- 1269 I 1768b17699 L-- 11LJ jI1L_
I 4 14 I 1270 I 1770u-17713 1 15-28 1 2 I 71 I 1I1271 j__17714-17727 j _ _29- 42 1_ 3 I 71 i
lb I 16 I 1272 I 17728-17741 1 43- 56 I 4 1 71 I
J 1 -A7_ j1 A7 _5h1 1kL_177 4i -17755fi_57- 70 I
1 1 1 1274 1 1775-17769 71- 84 1 6 I 71 I 1j 19 1-- 7 77 - 77 85 8 98-- I7- 7_i 1
I 20 I 20 1 276 I 17784-17796 I 99-111 I I 71 1 1 21 I21_j_ 277 LI 7797-178_1_110 _-125_ _91 1 2 I 22 I 1278 I 17811-17824 I 126-139 I 10 I 71
9 53I P3 I 23 1 iP7 I 17825-17838 I 4p_1 L_ 2171 I 24 I 24 I 126O I 17839-17952 I 54-167 I 12 I 71 I L t1 25LW2amp1 L1753-178 6_ 16-181L l3 7_1 _L
2b I 26 I 1282 I 17867-17A80 I 182-195 I 14 1 71 I 8j2j7 2 _L1283___L_17 1-17A94_A_196_209 __ 15 - 71 [
I 29 I 28 8 I 17895-17908 1 210-223 I 16 1 71 I
9 1 85 17909-1792__ 224-237 i17_ I 30 1 30 I 1286 I 17923-17936 I 238-251 I lb I 71 I I 31 I 31 I 12t7 I 17937-17950 I 1 14- 1 _ _
LS-1 shy
--------- --- ------------- --------- -- --- ---
----- - - ----------------------
rES6i 976
I REFI CYrLE IGMT I Fl IGHT I SPACECRAFT I REFERENCE I DATF I DAY I nAY I ORBITS I ORBITSiDAY _ N I
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I 13 1 348 I 1604 I 22357-22370 154-167 1 12 1 k9 I I14 I 4IIlamp 23123I163-18 1 13 1 P9 1
1 15 1 350 1_60 6 1 22385-22398 1j18P-195 1 14 R9 16 1 351 1 1607-I 22399-2212I 196-209 15 17 1 352 I 1608 I 2P413-22426 1 210-223 1 16 Z9 a18 ~3I~ I1609 2-4-D 2 -4oI 47 p17I 19 354 I 1610 22441-22454 1 238-251 1 18 1 s9
I-1 0 I135b 1611 I 224b b-224 68 I 1- 14 1 1 1 o 1 21 1 356 1612 I 22469-22482 ( 15- 28 1 2 1 00 I22 I b3 I2243-22496 29- 42 3 1 0 I-I 3 358 1 614 I 22497-22510 1 43- 56 1 4 no
2 1615 1 22511-225241 57- 70 1 5 a nO 124 IPS 360 i616 1 22525-22538 71- 841 6_ OI I2h 361 i61T - 1 22534-22552 85- 98 7 0 I
27 I 362 11618 22553-22565 1 99-111 I 8 oO I 1 28$ 6i -1i 61-9 1 256C-22579 1I ju25-- I9--l 0o
29 36 1620 1 2580-22593 I 12 6 -13 9_j 10 1 0 I 30 3 b I b21 22b94-226 If 4j- jS3 Ill I 0 I 31 1 366 1 1622 I 22608-22621 154-167 I 12 I 0
B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
VI I ai PA i 7 400 1 556A- 5581 23iM-251 I is 21 1 i 7 158I---4-t-t-51-q---- 1------ VF-l1 1
IP8I fi 402 1 r56SAA I 1- 28 1 2 1 22 1
LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
I A I h I u5 I h65- bAhn I II R I h I 2e I I I 67 07I 5666- 547q I Agi- 9 I 7a P2 1
0 ba I 4u IA4 8 U I ~~I
I 6 I 66 1 409 I q694- 6707 I 1t-1t26 9 I 22 I II FR I 4to I a 1 68 1 411 1 5721- 5714 1 14nfl15 1 11 1 P2
1 10 1 70 1 413 I q749- B762 I 16-181 1 13 P2 I i i I 7gid R763- 571 I Tx vt 5 I 1w I -e I
I 12 72 4plusmn5 I 5777- 5790 I IqA-Pfq I 1 22 I 1 73 t -trr5St-WRoPAn--T-19--1 22
I 14174 1 17I qS5-Si8 I 2P4-P7 1 17 1 P2 I i i 8 5I1--q -- 1T --- t- P7 -
I 16 76 1 419 I q83 - 5446 I 1 I1 I 23 I 1 1 1 J I1 2 1 A0 S~MU I INfl ia e i CA I 1 IS 1 78 1 421 I q861- Sg74 I q 42 1 24F 23 1 14 0 422 1 ampcm I nr --1 tsfl---qr- b I-n--I P0 I AO 4231 989- sqnP I 57- 701 5 1 3 I
I p I 2 4225 1 R917- Sqqo I 81 Ir- 7 1 23 1 ps j ms l 42 1 S3-5444 I I x 3 rIq1e
S94 I A41 427 I q945- sqSR I 111-1 6 I 9 1 P3 I I to S i tc5428 1 73 0 1 2 I9-qti
1 96 R6 I q97P- 5q85 I Ian-153 I It I P3 II 429
I P8 I AS I 42plusmn I 6000- 6013 I 16R-181 I 1 3 1 23 I v I A3 1 4 2 1 MUI19A I oi I4 1f l iA 1u iI
I t0 I 90 I 433 I 602R- 6n4 I 19AP09 I IS I P3 I 4S1 pwn 9 MLMssfrtrP283-MIS I A
B-10 LS-2
OEP PUAE OF THORMWAL PAGE IS Poop
LAN0hATP
AIfls19WJA
W W
I IGMT rI Gl(HT ISPACECRAFT I REFFRrEzCE REF CYCLE I I tJAIW I LJAJ I ~jAT I Uf~bI I I tMii urr-7yINrr-T
-----------------------------------------------------shy921-25-r--sS-6snsrr--2awPlnr1-1 1-i-23-
V I qa 36 I6070-bo0I1 21AEt I ISi1 23 1 a 1v 9 1p 4 amp l9 F T 1 jai P4
I 495g1 438 1 A099-A6111I R- 2A 1 2 24 1 5 1 461 s I Allo- S12b 1 79I - 7 6 tQ7 40 I Aip6-619q 1 1 w R6 I 4 24 1
1 i qg19 442 1 Aj46167g1 71-84 1 Aji 24 11
110 1 101 1 44 1 Ai8P 619S I 1 9 24 1Iqtt 1
112 1 10)3 1 446 1 6210- 6PP2 I127139 I 10 1 24 1 1 is I 0 1 4 7 1AI~lt-6 6
116 loft 1 448 16237- 6250 I lq4167 I lp 24 1 1 ~ ~ 0 ~-9-T-2~ ~ 19a 1 14-r- -n- I Mrt---24 1
IIamp I6107 1 450 1 6265- 6P79 I jAm195 1 14 i P4 I 1 l 11 10 1 4b I hdL4it hP3 I 19A[N9 I I1b TPWTej
IIS I I og 1 452 1 A293- 6106 1 21n-2P3 1 16 1 24 1 Itti -a3--T--R307rsi-t-1-n2flr---7 -- F--
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LS-2 B-11
LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
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B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
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LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
I UiTr I UAT I UAY I I N Iq---T-Ar -WT
-iA3-T---73 6-1 - T 2 1 IR 1 527 I 7339 7 P I 1- t I 1I 29 I
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LS-2 B-14
LANOSAT-9
AU a1976
I I G lT I i UIHT SPACECRAFT I REFFRENCr I REF CYCLE I
I UNIF I A I I 777 I7I I Qwtsi is I 1XT I NO0 I
I ~ r~ - tift---r--77-7u--- I I
I v I PIE 1 558 17771- 7784 1Igjpot95 1 14 I 30 1 -T Iri 13j--l5 7 1~W0~Su IU I amp 217 1 560 I 7799- 7AlP I 21n-223 I 16 I 30 I I 5 I 218 I bbl I 7813- IfPA I EP4-23 I 17 I 30 I I 6 1pig I b2 I 7827- 7A40 I 23A-51 I 1I 30 I I I 5U I I 1- I I -- Ti- --shy
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S-2 B-15
--
L AN-S-A1-P
I I GMV I I 161T I qPACzCRAFTr RErF-RENC REF I CYCLE I
I UATF I UAT I UAT I ORSIT I DR TS--- ArT Nshy -- r-------- l - r---
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LshyB-16
- -
-------------------------------------------------------
LANDSAThP
flCTs 1976
I MT i F IGHT I SaACECRAFT I REFFPFNCE I REF I CYCLE I T I fr---Ishy--1 I pNs I5 DAY 5 ep Lib U
3 I2 276 I 619 1 622- SA3 pq 42 I
I 2 621 I 650- RA I 57- 70 1 S 1 34 132781
5 I fIm I bee I I 1- i I ft 1 3 1
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I2 1 304o1 647 1 qoip- 9nPSI 1681A1 I plusmn3 351
LS-2B17
LANDSA- P
NOV 1970
I I 6MlT I Fi IbHPT I qRACECRAFT I REFIrKNtE I REF c YcL I
I UAIF I UAY I UAY I 5NffTW-7 BRffWTTS I UAY I N8I-
I I I ADD lgCm I t I I 307 t 650 I qoS- 9n67 I InP23 I 16I 35 I
j I s I1 fo1b d I 117 I 3 I 4I 39 1 6S2 I q89 9n9 I PfMA I i I 3S I
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I no I 3a5 I 678 I Q445- 9u - I I I T
RFPRODUWITYM OF THM LS-2ORIGMNAL PAGE FP001h B-18
--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
I I I SAO I 7-69 jn4499 94u I 11T-6-r- 1 i741-T7A I P I 227 I 680 I q4195 1 jP7139 I 10 I 37 I
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1 20 1365 1 708 1 q863- 9a7amp I 1R- 28 1 21 39 1
---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
SECTION 1
SUMMARY - LANDSAT-1 OPERATIONS
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
lb 349 1 1240 1I7282-1794 1 99-111 i 8 1 amp9 1
16 350 I 1241 1 17295-17308 1j-125 9 amp9 3 1I 124 2 1 17309-17322 1 126-139 10 1 amp9
I 352 I 1243 I7323-1733b 1 140-153 11 1 9 1
I 35a I 2 17337-17350 1 154-167 12 1 9
20 I3511 245 17351-17364 1 16R-181 13 1 9 1 21 I 355 I 124 I 1736b-17378 I 182-195 14 1 9 I
22 356 I i 1 I 17379-17392 I 196-209 15 1 pound9 1shy
124 823 357 1 17393-174o06 210-223 i lb 1 9
24 358 124 5 1 17407-17420 I 224-237 1 17 A9 1 25 359 150 17421-17434 1 238-251 18 i 9
26 360 2n 1174 I 1 70I II 44s T--14 11 1 1 1- 28 2 p 70 I
1252 17449-1746227 361 28 362 1253 17463-17476 1 - +2 1 - 3 -1 70 P9 363 1 1254 1 17477-17490 1 43 56 1 4 1 0 1
3c) 364 I255 17491-17504 I1 57- 70 1 5 1 70 31 365 1 1256 1 17505-17518 1 71- 84 j 6 1 70 1
------------------------------------------- ---------------------shy
LS-1 B-8
________
_ _ ---------------------------------------------------------------
LANDSAT-1 ________JANt976 _ _ _ _ _
I I GMT I FIIUHT I SPACECRAFT I NEFERENCE I REF I CYrLE I
i Dllil iL I 1S tbI tljlAlLJlt ItitL
1 1 1 - 1 - - 17519-17S32 1 S- 98 -7_- 70 1 2 1 2 I 12bg I 17533-17545 I 99-111 8 I 70 1
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-1 L1 I 316 t__72_J__21911-2192 1_21r2P3 - l I __s7 I-I 12 [ 317 1573 I 21925-21938 I 224-237 I 17 I a7 I 1j1 3_ SL _7m_-l__21239-219gb2 1_ 2_- 5 __L___8 j 1 14 I 319 1575 I 21953-21H66 I 1- 14 1 I1 8
_21 9 6 7 __-L _20- 1_57 _ 2 19R0 1 15 - ns I 1h-I 177 I 3
JL M - _ 28 2 i -- 1 321 15 i 21981-21994 29- 42 i I R8
I 17 I 322 L 8 -L 2199b-22a08 L 43- 56 x8 1 18 I 328 1579 I 22009-22022 I 57- 70 I 5 as 1 19 I 324 I i580 _L22023-2o36 1 71- 4 fL b _L 1 20 1 321 1581 I 22037-2 050 I 8S- 98 I 7 1 28 I 1 21 1 326 -L i52_ 22051-2206jZ j_3_-11 i8_ I p I P I 327 -1 583 1 22064-22077 ( 112-125 I 9 1 I-I 23I 328 I 1584 I 22078-2_209 Lj2A- 39 10_j2I R8 I I 24 1 329 1585 I 2209P-22105 I 140-153 I 11 I a8 I
1 26 1 331 1 i587 I 2212U-22133 I 168-181 I 13 1 a8 1 27 1 332 L 568 I 22134-22147 18_-195j_14 _ I PS 1 333 1 689-1 2214-8-22161 I 196-209 I 15 I 8 1 29 I 339 1 1590 I 22162-22175 I 210-223_--- -16 1 8__I I 30 1 335 I 1591 I 22176-22189 I 224-237 I 17 1 as
LS-1 B-19
_ _ _ _I-___T -_
DEL 1973Z6
I I GMT I FIIUHT I SPACECRAFT I REFERENCE I REF I CYrLE i I DATF I DAY I DAY I SRIlTSj fRBITsIAY _
1 1 33 1 i592 1 22190-e2203 1239-251 118 1 8-j I 2 I 337 I 1593 I 2220-22217 I 1- 14 I 1 r I
15941 3 1 338_1 122216-222 3 1 -IS- 28- L~ A~ 1 I 339 1-595 j 22232-22P45 29- 42 I 3 I I
S 340 1 596 1 2224h-22259 1 3- 56 1 4 1I L_ I h 341 I 597- Fa2260-22273 I b7- 70 1 5 1
1 7 1 342 1__j5 9 8 1 2P274-22287 71- 84 1 6 1 9 i343 1 99 I 228-2231 I 89- 98 7 1 - 9 I
1 9 1 344 1 1600 I 22302-22314i 99-111 8 R9 10 13 I 22315-22328 112-125 9 sZ9t601 1 1 1 11 1 346 1 1602 1 22329-22342 1 126-139 1 10 1 12 347 I 22432235b i q3-153 i11 a160 3 i
I 13 1 348 I 1604 I 22357-22370 154-167 1 12 1 k9 I I14 I 4IIlamp 23123I163-18 1 13 1 P9 1
1 15 1 350 1_60 6 1 22385-22398 1j18P-195 1 14 R9 16 1 351 1 1607-I 22399-2212I 196-209 15 17 1 352 I 1608 I 2P413-22426 1 210-223 1 16 Z9 a18 ~3I~ I1609 2-4-D 2 -4oI 47 p17I 19 354 I 1610 22441-22454 1 238-251 1 18 1 s9
I-1 0 I135b 1611 I 224b b-224 68 I 1- 14 1 1 1 o 1 21 1 356 1612 I 22469-22482 ( 15- 28 1 2 1 00 I22 I b3 I2243-22496 29- 42 3 1 0 I-I 3 358 1 614 I 22497-22510 1 43- 56 1 4 no
2 1615 1 22511-225241 57- 70 1 5 a nO 124 IPS 360 i616 1 22525-22538 71- 841 6_ OI I2h 361 i61T - 1 22534-22552 85- 98 7 0 I
27 I 362 11618 22553-22565 1 99-111 I 8 oO I 1 28$ 6i -1i 61-9 1 256C-22579 1I ju25-- I9--l 0o
29 36 1620 1 2580-22593 I 12 6 -13 9_j 10 1 0 I 30 3 b I b21 22b94-226 If 4j- jS3 Ill I 0 I 31 1 366 1 1622 I 22608-22621 154-167 I 12 I 0
B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
VI I ai PA i 7 400 1 556A- 5581 23iM-251 I is 21 1 i 7 158I---4-t-t-51-q---- 1------ VF-l1 1
IP8I fi 402 1 r56SAA I 1- 28 1 2 1 22 1
LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
I A I h I u5 I h65- bAhn I II R I h I 2e I I I 67 07I 5666- 547q I Agi- 9 I 7a P2 1
0 ba I 4u IA4 8 U I ~~I
I 6 I 66 1 409 I q694- 6707 I 1t-1t26 9 I 22 I II FR I 4to I a 1 68 1 411 1 5721- 5714 1 14nfl15 1 11 1 P2
1 10 1 70 1 413 I q749- B762 I 16-181 1 13 P2 I i i I 7gid R763- 571 I Tx vt 5 I 1w I -e I
I 12 72 4plusmn5 I 5777- 5790 I IqA-Pfq I 1 22 I 1 73 t -trr5St-WRoPAn--T-19--1 22
I 14174 1 17I qS5-Si8 I 2P4-P7 1 17 1 P2 I i i 8 5I1--q -- 1T --- t- P7 -
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MAYs 19T7A
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I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
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------------------------- ------------------------------------
LANDSAT P
JULj 197A
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AU a1976
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LANDSAThP
flCTs 1976
I MT i F IGHT I SaACECRAFT I REFFPFNCE I REF I CYCLE I T I fr---Ishy--1 I pNs I5 DAY 5 ep Lib U
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LS-2B17
LANDSA- P
NOV 1970
I I 6MlT I Fi IbHPT I qRACECRAFT I REFIrKNtE I REF c YcL I
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--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
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LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
SECTION 1
SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally
The Landsat-1 spacecraft was launched from the Western Test Range on 23 July 1972 at 180806 508Z The launch and orbital injection phase of the space flight was nominal and deployment of the spacecraft followed predictions Orbital operations of the spacecraft and payload subsystems were satisfactory through Orbit 147 after which an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2) Operations resumed until Orbit 196 when the Return Beam Vidicon failed to respond when commanded off The RBV was commanded off via alternate commands Landsat-1 continued to perform its imaging mission with the Multispectral Scanner and the remaining Wideband Video Tape Recorder proshyviding image data The remaining Wideband Tape Recorder experienced four suspensions of operation the last being in Orbit 9881 on 2 July 1974 and has not been used operationally since In Orbit 4396 an integrated circuit chip in the TMP failed disabling four TLM functions COMSTOR B has an intershymittent problem with cell 12 which is not being used operationally The B section of the USB with full power output of 1 5 watts was substituted for the A section in Orbit 10068 because of excessive decline of transmitter power The pitch flywheel stopped for 2 minutes in Orbit 8040 and for 8 hours 2 minutes in Orbits 11125 to 11130 It has been kept close to zero speed ever since using pitch-bias control The RMP was switched from B to A in Orbit 11257 as a precautionary measure after RMP B began showing current variations The DCS subsystem was turned off after Orbit 12690 and the function assumed by DCS in Landsat-2 Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015 Operation of NBR 2 resumed in Orbit 14116 until failure in Orbit 15253 when its operation was terminated Battery6 was turned off between Orbits 13346 and 14100 due to electrical characteristics causing high temperatures Between Orbits 14780 and 15467 Battery 6 was turned off again due to high temperature Because high current transient occurred at Battery 6 turn on m Orbit 15467 the battery turn-on command is temporarily suspended from use Battery 8 was turned off in Orbit 15588 due to electrical characteristics causing high temperature and will not be returned to service because of the battery ON command problemThe pitch flywheel stopped again for 45 minutes in Orbit 15309 and 3 minutes in Orbit 15312 Pitch flyshywheel motor driver duty cycle remained high from Orbit 15191 to Orbit 15393 when it returned to normal MSS operation was suspended during the pitch flywheel anomaly between Orbit 15309 and 15393 See Table 1-1 for a summary of payload rn-orbit operation
LS-1 1-1
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
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24 1 291 1 1554 I 21660-21673 I 210-223 16 R6 525 I 29 1 155 I 21674-21687 I 224-237 17 j6 1
6i5S 238-5 27 301 I 557 I 21702-21715 I 1- 1 1 u7 I 28 102 155 8 1 21716-2172 I 15- 28 2 i Rpound1 29 303 1559 1 21730-21743 I 29- 42 3 I 3o 304 I5b9 1 2174-2157 1 43- 56 44 i shy31 305 1 1561 I 21758-21771 I 57- 70 5 a7
I 26 30 I 2I6Sa2i~b 1 R8i
B-is LS-1
----------------------
--------------------------------------------------
-----------------------------------------------------------------
GMT I FI IGHT I SPACECRAFT I NEFFRENCE I REF I CYrLE I I DATF I DAY I DAY I 8_RITS I 8R-BITS I QAyI_- shy
-L _I I I 3Q6LL I__f____t 7 2r217 8 5 1i 71 __4 -__ -__ I7
I P 1 307 I 1563 1 21786-21799 I 85 98 I 7 7 I -vL 3 L23-08 L_1-5 6 4_L 2_1800-2112_L___9-111 J -_
I 4 1 30 I 1b5 I 21813-21626 I 112-125 I 9 I 7I I 5 I 31_L1827-21A40 1 126-139 1 10
I 6 1 311 1 1567 I 21841-21854 I 140-153 I 11 I a7 I I 7 1 12 1 b J 2 -18521968[ -167--- L 12 I ___7 I5415 --I 11 313 15b9 1869-21AR2 I 16R8181 1 13 1 u7 I W t5t 1 70 1 2188 3-2 L_ -14 i7_j596-1-182_1 -2 I 10 I 315 1 1571 1 21897-21910 I 196-209 I 15 I w7 I
-1 L1 I 316 t__72_J__21911-2192 1_21r2P3 - l I __s7 I-I 12 [ 317 1573 I 21925-21938 I 224-237 I 17 I a7 I 1j1 3_ SL _7m_-l__21239-219gb2 1_ 2_- 5 __L___8 j 1 14 I 319 1575 I 21953-21H66 I 1- 14 1 I1 8
_21 9 6 7 __-L _20- 1_57 _ 2 19R0 1 15 - ns I 1h-I 177 I 3
JL M - _ 28 2 i -- 1 321 15 i 21981-21994 29- 42 i I R8
I 17 I 322 L 8 -L 2199b-22a08 L 43- 56 x8 1 18 I 328 1579 I 22009-22022 I 57- 70 I 5 as 1 19 I 324 I i580 _L22023-2o36 1 71- 4 fL b _L 1 20 1 321 1581 I 22037-2 050 I 8S- 98 I 7 1 28 I 1 21 1 326 -L i52_ 22051-2206jZ j_3_-11 i8_ I p I P I 327 -1 583 1 22064-22077 ( 112-125 I 9 1 I-I 23I 328 I 1584 I 22078-2_209 Lj2A- 39 10_j2I R8 I I 24 1 329 1585 I 2209P-22105 I 140-153 I 11 I a8 I
1 26 1 331 1 i587 I 2212U-22133 I 168-181 I 13 1 a8 1 27 1 332 L 568 I 22134-22147 18_-195j_14 _ I PS 1 333 1 689-1 2214-8-22161 I 196-209 I 15 I 8 1 29 I 339 1 1590 I 22162-22175 I 210-223_--- -16 1 8__I I 30 1 335 I 1591 I 22176-22189 I 224-237 I 17 1 as
LS-1 B-19
_ _ _ _I-___T -_
DEL 1973Z6
I I GMT I FIIUHT I SPACECRAFT I REFERENCE I REF I CYrLE i I DATF I DAY I DAY I SRIlTSj fRBITsIAY _
1 1 33 1 i592 1 22190-e2203 1239-251 118 1 8-j I 2 I 337 I 1593 I 2220-22217 I 1- 14 I 1 r I
15941 3 1 338_1 122216-222 3 1 -IS- 28- L~ A~ 1 I 339 1-595 j 22232-22P45 29- 42 I 3 I I
S 340 1 596 1 2224h-22259 1 3- 56 1 4 1I L_ I h 341 I 597- Fa2260-22273 I b7- 70 1 5 1
1 7 1 342 1__j5 9 8 1 2P274-22287 71- 84 1 6 1 9 i343 1 99 I 228-2231 I 89- 98 7 1 - 9 I
1 9 1 344 1 1600 I 22302-22314i 99-111 8 R9 10 13 I 22315-22328 112-125 9 sZ9t601 1 1 1 11 1 346 1 1602 1 22329-22342 1 126-139 1 10 1 12 347 I 22432235b i q3-153 i11 a160 3 i
I 13 1 348 I 1604 I 22357-22370 154-167 1 12 1 k9 I I14 I 4IIlamp 23123I163-18 1 13 1 P9 1
1 15 1 350 1_60 6 1 22385-22398 1j18P-195 1 14 R9 16 1 351 1 1607-I 22399-2212I 196-209 15 17 1 352 I 1608 I 2P413-22426 1 210-223 1 16 Z9 a18 ~3I~ I1609 2-4-D 2 -4oI 47 p17I 19 354 I 1610 22441-22454 1 238-251 1 18 1 s9
I-1 0 I135b 1611 I 224b b-224 68 I 1- 14 1 1 1 o 1 21 1 356 1612 I 22469-22482 ( 15- 28 1 2 1 00 I22 I b3 I2243-22496 29- 42 3 1 0 I-I 3 358 1 614 I 22497-22510 1 43- 56 1 4 no
2 1615 1 22511-225241 57- 70 1 5 a nO 124 IPS 360 i616 1 22525-22538 71- 841 6_ OI I2h 361 i61T - 1 22534-22552 85- 98 7 0 I
27 I 362 11618 22553-22565 1 99-111 I 8 oO I 1 28$ 6i -1i 61-9 1 256C-22579 1I ju25-- I9--l 0o
29 36 1620 1 2580-22593 I 12 6 -13 9_j 10 1 0 I 30 3 b I b21 22b94-226 If 4j- jS3 Ill I 0 I 31 1 366 1 1622 I 22608-22621 154-167 I 12 I 0
B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
VI I ai PA i 7 400 1 556A- 5581 23iM-251 I is 21 1 i 7 158I---4-t-t-51-q---- 1------ VF-l1 1
IP8I fi 402 1 r56SAA I 1- 28 1 2 1 22 1
LS-2 B-9
LANDSAlr
MAR 197amp
I I GMIT I Fl1IGHT I qRACFCRAFT I REFFRNCE I REF CYCLE I I UA[F I UAY I UAT I eRMYT I Y N E r-
I I Al 1 I 0O1-e- 4A I f77--rFr~ S IP1 05 I 963R- SASI 57- 0 I 5 i 1 2 1
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B-10 LS-2
OEP PUAE OF THORMWAL PAGE IS Poop
LAN0hATP
AIfls19WJA
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LS-2 B-11
LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
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B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
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LS- 2 V B-13
------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
I UiTr I UAT I UAY I I N Iq---T-Ar -WT
-iA3-T---73 6-1 - T 2 1 IR 1 527 I 7339 7 P I 1- t I 1I 29 I
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LS-2 B-14
LANOSAT-9
AU a1976
I I G lT I i UIHT SPACECRAFT I REFFRENCr I REF CYCLE I
I UNIF I A I I 777 I7I I Qwtsi is I 1XT I NO0 I
I ~ r~ - tift---r--77-7u--- I I
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114 PP7 570 1 7939- 7qP I qqjp I a g 31 1
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S-2 B-15
--
L AN-S-A1-P
I I GMV I I 161T I qPACzCRAFTr RErF-RENC REF I CYCLE I
I UATF I UAT I UAT I ORSIT I DR TS--- ArT Nshy -- r-------- l - r---
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LshyB-16
- -
-------------------------------------------------------
LANDSAThP
flCTs 1976
I MT i F IGHT I SaACECRAFT I REFFPFNCE I REF I CYCLE I T I fr---Ishy--1 I pNs I5 DAY 5 ep Lib U
3 I2 276 I 619 1 622- SA3 pq 42 I
I 2 621 I 650- RA I 57- 70 1 S 1 34 132781
5 I fIm I bee I I 1- i I ft 1 3 1
6 128O1 623 I R678- f91 I Sq 98 I 7 34 1
7 I ear-S I I1-2 Ie n I A706- p71q 111-126 1 341 a I PA2 I 625
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I 16 1 W30 I 633 I RI7- 88A0 I 2P4P37 1 17 1 34 1
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I 90 1 294 1 637 1 A873- SARA I 9qe42 I S 3 51as1
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AR 9S 1 7 351iP4 1 298 1 641 1 A929-Sq42 1 T- - - - S
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26 12300 1 643 1 A9S7- Rq70 I 11112P6 1 9 1 35 1
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I2 1 304o1 647 1 qoip- 9nPSI 1681A1 I plusmn3 351
LS-2B17
LANDSA- P
NOV 1970
I I 6MlT I Fi IbHPT I qRACECRAFT I REFIrKNtE I REF c YcL I
I UAIF I UAY I UAY I 5NffTW-7 BRffWTTS I UAY I N8I-
I I I ADD lgCm I t I I 307 t 650 I qoS- 9n67 I InP23 I 16I 35 I
j I s I1 fo1b d I 117 I 3 I 4I 39 1 6S2 I q89 9n9 I PfMA I i I 3S I
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i 1P 1 317 I 660 I q19- 907 1 qq1tP I A 36 I SI 3i 1 Sal 20R- 7III- 1R-----3-
I Il 1 319 I 662 1 922P- 9PI I I719 I t0 1 36 I
1 16 1 3PI 1 664 I 9249- 9PA2 I 1941A7 1 3 I 7 1 Jed 1 bt 1 4262 9wh Ihm9l~f1 1 13 1 t
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I 98 I 333 I 676 I 9417- 9430 I 71 h4 1 6 1 27 I
I no I 3a5 I 678 I Q445- 9u - I I I T
RFPRODUWITYM OF THM LS-2ORIGMNAL PAGE FP001h B-18
--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
I I I SAO I 7-69 jn4499 94u I 11T-6-r- 1 i741-T7A I P I 227 I 680 I q4195 1 jP7139 I 10 I 37 I
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---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
Table 1-1 n-Orbit Payload System Performance Launch Thru Orbit 17804 (12176) Landsat-1
RB Total Scenes Imaged 1690 AVG ScenesDay 139 Total Area Imaged 147
(millions of sq mi) ON TIME (hr) 140 ONOFF Cycles 91 Real Time Images 57 Recorded Images 43
MSS Total Scenes Images 206 093 AVG ScenesDay 176 Total Area Imaged 1797
(millions of sq n mi) ON TIME (hr) ONOFF Cycles
2172 16 090
Real Time Images 78 0 Recorded Images 22
DCS Messages at OCC 1 152 045 Non-Perfect MSGS 90691 Max DCPs ACTIVEDAY 114 Users 44 Avg MSGACTIVE Orbit 181 ON TIME (hr) 218202
WPA-1 Real Time Mode 55 Playback Mode 45 ON TIME (hr) 319 ONOFF Cycles 312
WPA-2 Real Time Mode 78 PB Mode 22 ON TIME (hr) 2106 ONOFF Cycles 13802
WBVTR-1 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I Minor Frame Sync
Error Count in PB Failed Orb 9881 Time Head-Tape Contact 7328
(hr) Cycles Head-Tape Contact 11 954 ON TIME (hr) 9276
WBVTR-2 Record Mode 38 Playback Mode 41 Rewind Mode 20 Standby Mode I MFSE Count in PB Failed Orb 148 Time Head-Tape Contact 5 1
(hr) Cycles Head-Tape Contact 44 ON TIME (hr) 65
LS-1 1-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-1
SECTION 2
ORBITAL PARAMETERS
Landsat-1 launch and injection was satisfactory After several 18-day ground trace repeat cycles orbit maintenance burns were made in Orbits 938 2416 6390 7826 11367 11464 13611 and 14365 An unplanned orbit change occurred due to freon gas expended during the pitch flywheel emergency (Orbits 11125 and 11130)
No orbit maintenance burn occurred during this report period
The orbital parameters-are given in Table 2-1 Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns The longitude error has been maintained within + 10 nm in the east-west dishyrection at the equator as planned Figure 2-2 shows the change of sun time at the descending node Appendix B gives ground trace repeat cycle predictions
LS-1 2-1
tTable 2-1 Landsat 1 Brouwer Mean Orbital Parameters
Semi Two Argument Major Body Nodal of Right Mean
Dat Apogee
(km) Perigee
(kin) Inclination
(Deg) Axis (kn) Eccentricity
Period (Min)
Period (Min)
Perigee (Deg)
Ascension (Deg)
Anomaly (Deg)
25 Oct 1972 9173 8981 99103 7285850 000132 103152 103268 93721 1060 86484
25 Jan 1973 9223 8931 99090 7285 865 000200 103153 103268 133693 91 805 52797
25 Apr 1973 911056 888763 99073 7285767 000073 103151 103267 168857 181411 11098
25 Jul 1973 914 341 900810 99068 7285741 000093 103150 103266 95602 268944 84301
25 Oct 1973 922913 893229 99056 7285786 000198 103151 103266 65071 0291 301002
25 Jan 1974 915873 899111 99041 7285657 000115 103 148 103264 160 866 88606 19049
24 Apr 1974 920090 912672 99023 7285691 0000802 103149 103265 117631 176743 62319
23 Jul 1974 922363 892629 99017 7285661 0002041 103148 103264 109225 269779 70540
23 Oct 1974 918657 896316 99004 7285652 000153 103148 103264 150750 354743 29110
24 Jan 1975 91418 90067 98990 7285590 0000928 103 147 103262 278 848 85403 261 138
24 Apr 1975 91474 90005 98972 7285 559 0001008 103 146 103262 37047 173 043 142764
25 Jul 1975 91512 89963 98964 7285541 0001063 103145 103261 138138 262528 41661
23 Oct 1975 914 19 90054 98951 7285 531 0000937 103145 103261 250 370 349 952 289 612
24 Jan 1976 91439 90032 98936 7285523 0000966 103145 103261 2826 80147 177049
L
r
j10- ORBIT ORBIT ORBIT ORBIT 9-ADJUST ADJUSTADUT DJS
NO 4 ADJUST ADJUST ACS 8 +72 NO5 NO 6 NO 7 GAS DUMP
+620 +6 85 +6537+71 O
6 ILIzj in aR HISTORY5 000 PERIOD OF LOW
0oLI ACS2PITCH GATE LbU) Ud
PERIOD I- 0EAST
O~ -l00 -3 -490WESTz 11
ORB ITADJUST0 -4
10NO
( JU L 26- A U NO CUU
-1
-11
10
I 0
-8TO ACHIEVE
-9 -
NOMINAL-PARAMETERSU
I I I I fI
6 18 16 22 2626
172)ORBIT
ToREVOLUTIONS1
-I008
I -I I I I f
363 0 4 634 5 63B 66 42
REPEAT CYCLES
I I I I I
764 6 8 650 9654
REPEAT
I I I I
10 65 8 116 62
I I
12666
CYCLE
I I- I I
136 70 14674
I I
15678
I I
16 68 2
I I I
17686
REVOLUTIONS
TrackGround
on Landsat-1
Orbit AdjustsofEffect2-1
Figure
0944
0942
0940
0938
0936
0934
0932
0930
-0928
0926 0 Z 0924 rI0922
0920 Z 0918
0916
j 0914
0912
J 0910
0908 1-24-76
0906 09 07 16
0904 -CURRENT
0902 REPORT
0900 A S ON DiJ FMA M J J AS O N DiJF MA MJ J AS ON DJ FM A M J J AS O N De 73 74 75 76
TIME--IP
Figure 2-2 Local Mean Time of Descending Node
SECTION 3
POWER SUBSYSTEM (PWR)
LANDSAT-1
SECTION 3
POWER SUBSYSTEM (PWR)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this reshyport period Compensation loads and auxiliary loads dissipated the excess power above the battery and load requirements using Landsat-l power management procedures Solar array degradation was -283 at the end of 42 months in orbit The power subsystem is predicted to have adequate power through 1976 for the present Landsat-1 payload configuration and may extend to 1977 depending on the electrochemical degrashydation of the battery packs and the effect of increasing sun angle on array tracking (see Section 4 also)
A plot of measured and predicted midday solar array current is shown in Figure 3-1 Figure 3-2 shows actual and predicted midday solar array degradation Figure 3-3 shows actual sun angles to the spacecraft and solar panels Figure 3-4 is a prediction of the variation of sun angle through 1977 for Landsat-1 and 2
It is noted in Figure 3-1 that the high noon solar array current is slightly lower than predicted This is due to slightly different solar panel sun angles and operating point high noon solar array degradation than initially predicted
During Orbits 16702 and 16703 (3 November 1975) Landsat-1 passed through the partial solar eclipse over the Southern Hemisphere Real-tine adjustments to the auxiliary loads were made to compensate for the loss in array energy
Battery 8 switched off m Orbit 15588 (15 August 1975) iremained off-line throughout this report period The battery probably discharged to zero volts around 1 December 1975 though telemetry verification is impossible because the sensor threshold is 1933 volts
Beginning in Orbit 15794 (30 August 1975) an adjustment to the power management program has kept the batteries slightly undercharged to keep them within acceptable temperature limits
Temperature spread between batteries has ranged from 7 5 to 1250C during the current report period battery 5 in bay 14 having the highest temperature The wider range and higher peak in temperature was caused by increased sun intensity and sun angle as well as a possible malfunction of the thermal shutter for bay 14 (See Section 11 also) Battery packs averaged a typical 80 to 93Depths of Discharge (DOD) with fairly good charge and discharge characteristics for individual batteries
The power system electronics performed well in this report period with all voltages stable Table 3-1 shows major power subsystem parameters and Table 3-2 shows power subsystem telemetry for selected orbits Some parameters in Table 3-2 may be slightly different from Table 3-1 because Table 3-1 uses a power management time span (mght followed by a day) whereas the time span used in Table 3-2 is the playback period for the NBB The Shunt Linnter has not operated since Orbit 3 because the unregulated voltage has been held below cut-in voltage by power management
LS-1 3-1
LANDSAT- 1
16 - HIGH NOON
SOLAR ARRAY CURRENT
PREDICTED CURRENT14 ADJUSTED FOR SUN FULL INTENSITY SUN ANGLE
_3- SO AND RADIATION DEGRADATION-x I shyw (PEAK LEVEL) PREDICTED
2 ACTUAL Si - JRBV + POW WBDLK (450 FMF)
z1 (AVERAGE LEVEL) m MSS +20W WBDLK (450 FME) AVERAGE LEVEL
D 9 MINIMUM SC WITHOUT PAYLOAD
C--1
lt 0plusmn
7CURRENT REPORT
6 PERIOD 0 U) z 8 z
5
4
1972 1973 1974 1975 1976 1977 1978
0 200 400 600 800 1000 1200 1400 1600 1800 2000
LANDSAT - 1 DAYS SINCE LAUNCH
Figure 3-1 Midday Solar Array Current
-2-
-4
-6
-8
-10
-12
t-14
Z -16
ii 18-22IL
-20
-22
-24
-26
-28
-30
ONSET OF SOLAR FLARE
ACTIVITY 8472 - 8872
- LANDSAT-I
-2 PRELAUNCH PREDICTED OLAR ARRAY DEGRADATION
(MIDDAY) 2 -- = 3258 X 10 DENICM DAY
N
4LANDSAT-1 ACTUAL SOLAR ARRAY 4
DEGRADATION IA(MIDDAY)
(1Au NORMAL SUN) (155 AMP BASE)
42 MONTHS -283
I I
10 100
LANDSAT-1 DAYS FROM LAUNCH
1000 10000
Figure 3-2 IA (Midday) Degradation vs Days
p
47 - 14
46 - 13
45 - 12
44 - I IoId
43 -10 e0 42 - 9 a
I
I41 83
Wd40-7 Q) w 39 6 Z
38 - 5w - z
Iz 374lt
I- - oo R36 lt
Szao - P35 - -2
I - I34 I
32 -1 0 z
~31 -2 Z
U)29 -4 0
28 ~CURRENT -5 I 27REPORT -shy 6
26PERIOD -shy 7
I L -8
100 200 300 400 500 600 700 800 900 1000 1100 1200 o1300
DAYS IN ORBIT
Figure 3-3 Actual g and y (Paddle) Sun Angles Landsat-1
FOLDOUT FRAM-
JANARENPURYMARN PRL MAY I JULY ALIUSYSNTMER OYEE OVM
6 01 1 e N A 1 1 1 1 g R 1 og I g l 5g
311 f
HEH
E
SIOI BOE0 51 15205 015 025 101 202 SIU SNO o a lO~s ONB N 1 1520 0 5 ICIB~+
JANU RYEBR ARY AA2R ARILMAY UNEJO~ AU5 S~ rfl MSE OCE REBNOV MBE
Fiur -PeitdBtnls
Ladat1amp217amp 9 ES-i 3-56
Table 3-1 Lasdsat-1 M
ajor Power Su~byitem Pararoeters
ORBIT NO 26 8098 10178 15254 17002 17292 17853
BATT I bMAX 3248 3291 8325 2316 3257 3205 S214
2 CGE 3248 3291 3316 3316 257 3205 2205
3 VOLTS 8248 8299 3325 8316 3265 3205 3214
4 3248 3299 3325 8316 3268 3205 3214
5 3248 3299 3333 3325 3265 8214 2222
5 3231 3291 3325 2821 3257 8205 3205
7 2222 3291 3325 3316 2265 3206 8214
8 88214 3291 3325 3316 2151 -- --
AVERAGE + 3238 3292 3325 3317 3262 3206 8213
BATT 1 EN- 2881 2880 2898 2918 2872 2864 2898
2 OF- 2881 2830 2898 2915 2881 2872 2898
8 NIGHT 2881 2830 2898 2915 2873 2864 2889
4 VOLTS 2889 2838 2898 2918 2881 2864 2898
5 2889 2838 2906 2923 2881 2872 2906
8 2881 2830 2898 2812 2872 2864 2898
7 2881 2830 2898 2913 2881 2864 2898
8 2881 2820 2898 2915 2181 -- --
AVERAC + 2884 2832 2899 2916 2871 2866 2891
BATT 1 ( ) CHGE 1311 1358 1396 1527 1489 1468 1393
2 SHARE 1293 1358 1396 1527 1489 1468 1393
S() 1138 1188 1195 1359 1222 1369 1291
4 1239 1195 1228 1406 1420 1405 1371
8 1232 1185 1193 13683 1375 1348 1513
6 + 1280 1235 1179 1627 1638 1656
7 1262 1242 121 1259 312 1308 1382
8 1245 1210 1198 1454 i
BATT 1 LOAD 1271 1244 1255 1467 1462 1439 1299
2 ShARE 1290 1362 1370 1888 1479 1807 1435
3 () 1148 1191 1228 1385 1380 1294 1305
4 1277 1901 1312 1491 1468 1474 1464
5 1254 1242 1260 1402 1358 1309 1485
6 1283 1221 1130 1585 1322 1609
7 1280 1241 1250 1377 I61 1350 1408
1222 1198 1197 1288
BATT 1 TEMP 2111 2485 2476 2312 2214 2259 2323
2 IN 1874 2142 2089 1932 1831 1845 1844
3 (0C) 1877 2029 2016 1877 1782 1737 1767
4 2157 2217 2832 2271 2220 2247 2275
5 2182 2386 2409 2369 2518 2676 3066
64 2121 2427 2475 2210 2452 2584 2906
8 2141 2501 2496 2375 2402 2514 2740
3 2182 2514 2524 2469 2313 2391 2549
AVERAGE 2081 2349 2353 2226 2210 2282 2424
S0 EG BUS P211M(V) 1768 15834 1850 1379 128S4 1290 1231
COIP MOAD WlR(22) 490 S48 419 294 174 174 174
(PO SC REG BUS PWR)
PL REGSU8 1W8 (Xh) 162 137 89 89 91 94 91
CD RATLO 106 112 121 115 125 095 107
TOTAL CLABGE (A-34) 2092 29021 2583 22929 21154 15715 16492
TOTAL DISCHARGE (A-K 2909 26628 2142 19413 16971 16581 15349
SOLAR ARRAY (A-M 10440 9080 8320 8760 8250 8350 8300
SA PEAK I (AMPI) 158 1368 1244 1160 1200 1200 1168
MIDDAY ARRAY I (AMP) 1501 1280 NA 1104 1136 1144 1128
SUN ANGLE (DEG) -33 -354 -182 149 642 914 1335
MA R PAD TEMIP (0C) +6200 +6800 6220 620 6440 6560 6320
MII R PAD TEP (0C) -6200 -5900 -4279 -43IB -3854 -3671 -3368
MAX L PAD TEMP (0C) +5790 +6050 5600 5600 6200 6320 6320
MN L PAD TEMIP (C) -6700 -6400 -4700 -4625 -4218 -09 -3611
After the telemetry failure in Orbit 4896 Baftery 2 charge share was taken equal to Battery I charge as
an agproximation in oider to derive a charge share value of each battery
Battery 6 turned off in Orbit 14780 was retuedto service in Orbit 15467
Battery was turned off in Orbit 15588 and remnined off through the end of ths report period
+ Aversge of batteries on-line
Table 0-2 LTaadsat-1Power Subsystem Analog Telemetry (Average Value Tor Data Received m NBT Playbac)
Orbits
Futotion Deacrpthon Unit 508 10102 10251 17004 17894 17854
6001 BATT I DISC A 094 081 081 051 000 00 075
6001 2 U95
6003 3 084 070 080 086 07o 070 070
0004 4 06003 006 092 06 0 83 070
6008 5 09 062 0 B2 007 079 077 081
091 072 08 087 082
6007 7 094 082 080 0 so 0 70 0 17 070
6008 4 001 077 078 080 000 0 00 000
6011 BATT I C O AM 058 0 00 069 052 041 04 005
6012 2
cc006 6- 078 0 00
057 4
B01s 0 050 040 060 040 037 0 12 032
6014 4 004 081 000 040 059 023 014
6015 5 004 000 056 040 038 012 037
6016 0- 057 082 056 000 045 0 8 040
055 05 060 046 036 001 034
0010 0 055 052 058 049 000 000 000
6021 BATT I VOLT VDC 0087 31 24 31 64 1 62 31 0a 30 01 0084
6022 2 1087 0125 5160 3162 3107 0000 2083
6023 S 3087 3125 5166 1162 3107 3079 0082
6024 4 1090 8128 3175 3165 3110 80803 8086
6025 5 3095 31303 175 2171 3116 3090 3092
626 W 8086 8124 3105 2810 3100 0079 2082
6027 7 3089 3127 3168 3164 3110 3083 3006
0020 500 3089 3107 3160 3163 2181 shy
6031 BATT I TEMP D31C 2117 2448 2600 2002 2217 2260 2323
0032 a 1800 3100 2281 1928 1036 1043 1844
6033 0 1076 2017 2125 1876 1725 1738 1756
034 4 2157 2304 230 269 2224 2247 2273
0025 5 21084 2277 2478 2364 2522 2674 300
6036 6+ 2124 2427 2678 2208 456 206 2903
6037 7 2143 248 2609 2367 24 06 2515 2 11
0038 0 2186 25 02 2621 24 51 2013 23 91 255
fl040 RT PAD TEMP DOC 2502 2722 2710 2729 3208 3S45 336
6041 A PAD V 1A VDC 3340 805 843 3418 3309 3256 3171
6042 R PAD V I VDC 3329 3350 3360 8292 0185 3140 3103
6044 UT PAD PERT1 DOC 1414 1661 1911 1984 2557 2730 289
6045 L PAD V F VDC 0369 3416 3467 3463 3082 Ms 50 3
6046 L PAD V G TDC 3608 0419 0472 840 3887 3 54 347
6050 50 U BUS V VDC 2124 3160 3260 5207 315 3122 1125
6051 SC TO0 BUS V VDC 2404 2468 2455 24 54 24 0 2404 2404
6062 AUX 1REGA V VDO 2341 2348 2347 2049 2050 2349 2246
6053 AUX )ING R V VDC 2350 2360 2300 23 50 2350 2350 2350
6054 SOLAR I AMP 1487 1269 1160 1083 1114 11 10 1074
60+ 0A G BUS I AMP 711 020 680 58 504 002 500
6056+ SC RG BUS I AMP 711 627 670 562 503 501 502
6058 PC MOD T 1 DC 2182 2223 2322 206 1972 1070 I 70
6069 PC MOD T 2 DOC 216 2253 2300 2117 2039 20 39 20 54
6070 PL AG BUS V VDC 2466 24 68 2400 2468 2467 24 66 2466
6071 PL UR BUS V DC 3108 2153 3192 3192 3136 21 06 3108
6072 PL ED I 057 030 037 010
6017 7
0US AMP 056 020 007
6072 P AUX A V VDC 2351 23 01 2350 2350 2350 23 50 2350
6074 P AUX B V VDC 2351 201 - 2350 2350 2360 2050 2250
6072 PA MOD T 1 DOC 2150 2310 2362 2144 2092 2092 21 14
6070 PRt 0OD T 2 DOC 2034 2145 2181 1988 1059 1069 1084
6079 FUSE BLOW V VDC 2456 2457 -2460 24 5 2458 2459 0457
6080 S5171 I AMP 000 000 000 000 000 000 000
6081 Mm1T 2 0 AmIp 000 000 000 000 000 000 000
602 SHDNT13 AMP 000 000 000 000 000 000 000
6083 SIN T14 AXRn 000 000 000 005 000 000 000
6064 a1ll=- 15 AMP 000 000 000 00O 000 0 05 000
6085 SHINT 6 I AMP 000 000 000 000 000 000 000
6086 SHUNT 7 1 AMP 000 000 000 000 000 000 000
6087 I17NT 8 AtOP 000 000 000 000 000 000 000
6100 PL O BUS I AMP 0058 056 036 036 027 037 038
Total NO M2AJOR2 RIAME AMI 7640 3890 3840 780 780 785 707
leochon 6002 6012 mssin data reullccd from disabled teleme try rasulnog f o IC chip faiure which
affected charge current dfrectly an discharge current irdectly
+ 0-NC 6055 6056 6072 data it dertvu from Pseudo 0UNC 055 6156 6172 used after charpg to 10de 11
o-Battery 6 turnod off in Orbit 14760 was returned to sorvce m Orbot 15467
Battory 8 Was ed Off l Cabot 1558 sau remained off talgh the ld of tis report pecoa
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
LANDSAT-I
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-ls ACS system accurately maintained the spacecrafts attitude even though the Pitch Flywheel was malfunctiomng during the first days of this report period
With the exception of Orbits 16557 (24 October 1975) through 16613 (28 October 1975) the Pitch Flywheel performed normally and its duty cycle averaged less than 7 During Orbitsl1657 through 16613 the Pitch Flywheels duty cycle rose about 45 and several short term 100 duty cycles resulted in momentary Pitch Flywheel stoppages The condition cleared itself without intervention in Orbit 16614 (28 October 1975) MSS activities were not affected during this interval
Use of pneumatics to stabilize the spacecraft during the Pitch Flywheel anomaly was not required
Due to the Pitch Flywheels malfunction history the ACS system is commanded into the Normal mode only during the six consecutive daily orbits of MSS activity During the remaining daily orbits of non-MSS activity the ACS system is commanded into the Roll Diff Tach High Gain mode to unload Roll momentum and conserve freon
Positive 060 Pitch Position Bias is employed to limit the Pitch Wheels speed between -10 RPM and -100 RPM and to prevent it from siezing with an excess of stored momentum
Since continuous NBTR coverage is no longer available to account for all pneumatic gating Figure 4-1 was prepared to approximate average gating frequency The approximate slope of the curve in Figure 4-1 indicates a gating frequency of approximately 4 -Roll gates per day Figure 4-1 also shows that the freon pressure dropped the fastest between Orbits 17000 (24 November 75) and 17160 (6 December 75) These orbits occurred during Landsat ls seasons of maximum gating activity and the pressure drop this
_period is consistent with Landsat ls seasonal gating history240
230 - A 4 -ROLL OATESDAY
i 210 t0
00
lt 200
8 to 12 14 16 18 2D 22 U4 26 28 3 2 U 6 0 2 4 6
BITNUMBER~OR
CALENDAR Fgure 4- Landsat-I Freon History Orbits 14263 (5-12-75) o 17868 (1-2-76)
4shyLS-0
Figure 4-2 predicts Landsat-ls remaining freon life as a function of gating frequency and Figure 4-3 plots remaining Rol gates as a function of tank pressure
IR= 5
IR 0 -
IR 10
J=15
_I R=19 81 (19 JAN 76)
7 -1
IR REMAINING USABLE IMPULSE LB-SECS
0
2
0 200 400 600 800 1000
REvAINING FREON LIFE DAYS
Figure 4-2 Landsat-1 Remain Ig Freon Life vs Gating Frequency
Ito
200 76
ISO 190
180
170
160
ISO S 150
140
130
120
Ito
10
90 0 100 200 - 300 400 500 600 700 800 900
ROLL GATES REMAINING
Figure 4-3 Landsat-1 Pressure - Roll Gate Prediction
REPRODUCIBILIny OF THE Lshy4R PAEB OLS-1ORICINM PAGE 18 POOR
I
4-2
During early January 1976 (approximately Orbit 17660 11 January 1976) solar array tracking errors began to appear due to the increasing value of Beta angle As Beta increased the sun sensors field of view for optimum response is exceeded particularly with the ACS in the Normal mode where sun sensor shadowing exists When the ACS is commanded into the Roll Diff Tach High Gain mode the spacecraft assumes a minus Roll attitude error winch causes the Right Sun Sensor to rotate toward the sun The Sun Sensor receives more exposure and drives the Right Solar Array into alignment with the sun Left Solar Array tracking error is relativelyconstant at 60 to 8 lagging regardless of ACS mode
Maximum values of Beta angle increase cyclically with time and during tins season should peak at 4780 on 18 February 1976 The effect of solar array misalignment on payload operations during tis season should be minimal however as maximum Beta angle values continue to increase in the future solar arry trackLrg will degrade accordingly
RMP 1 is functioning normally Pressuretemperature ratios have all been satisfactory
The forward scanner pressure decreased from 281 in Orbit 16530 (21 October 1975) to 280 in Orbit 17868 (25 January 1976) and is following the leak pattern described in preous reports
Tables 4-1 4-2 and 4-3 are a summary of Landsat-ls Attitude Control Subsystem Telemetry
Table 4-1 Landsat-1 ACS Temperature and Pressure Telemetry Summary
Orbit
Function Units 31 5099 10182 15254 16530 17408 17826
1084 RMP 1 Gyro Temperature DGc 445 2306 2122 4240 4311 4383 4332
1094 RMP 2 Gyro Temperature DGC 743 7510 4345 2405 2515 26 08 2568
1222 SAD RT MIRHSING Temp DGC 211 2200 2055 2289 2369 2454 2367
1242 SAD LT MTR HSING Temp DoG 270 3038 2818 2953 30 79 3174 31 31
1223 SAD RT MTR WNDNG Temp DGC 25 3 2654 24 63 2706 2745 28 10 2715
1243 SAD LT MTR WNDNG Temp Doc 287 3292 30 22 31 98 3344 3452 3294
1228 SADRTYHSG Pressure PSI 7 6 735 712 688 6 88 6 85 6 80
1248 SAD LT HSG Pressure PSI 7 0 6 86 6 47 6 18 618 6 13 6 10
1007 FWD Scanner MTR Temp DGC 198 1988 I8 46 2036 2062 2114 2067
1016 Rear Stanner MTR Temp DC 20 5 1983 17 86 1924 2002 20 68 2019
1003 FWD Scanner Pressure PSI 46 4 02 350 300 281 2 80 280
1012 Rear Scanner Pressure PSI 78 787 744 6 97 696 696 6 96
1212 Gas Tank Pressure PSI 19820 1702 34 145419 235 44 223 05 20286 18606
1210 Gas Tank Temperature DGC 22 6 24 30 2256 2436 2520 25 88- 2530
1213 Manifold Pressure PSI 567 57 44 5973 6167 6120 6165 6167
1211 Manifold Temperature DGC 21 9 2362 2177 2382 2478 2559 24 97
1059 CLB Power Supply Card Temp DeC 371 4054 3883 4058 4146 42 19 4166
1260 ACS Baseplate 1 DC 254 2793 2536 2654 2784 2887 2857
1261 ACS Baseplate 2 DGC 229 2473 2300 25 05 26 14 2704 2665
1262 ACS Baseplate 3 DGC 234 2369 2197 2495 2585 26 66 2600
1263 TH01 STS DGC -6 8 -097 -341 122 529 6 91 758
1264 THO2 STS DGC -146 -942 -827 -450 -196 -117 1 74
1265 TH03 STS DGC -31 931 758 1292 1591 1784 1967
1266 TH04 STS DC -139 285 -185 240 5 29 761 706
1267 TH05 STS DGC -89 -116 -517 292 9 37 1162 1356
1224 SAD R PSST DeC 39 5 6021 6225 64 74 6672 6683 6416
1244 SAD L FSST DC 271 5111 5321 5469 5740 6899 5965 Pressure OROP due to PCM count step not to loss of freon
LS-t 4-3
Table 4-2 Landsat-1 ACS Voltages and Currents
Orbit
Function - Units 31 5099 10182 15254 16530 17408 17826
1057 CLB Power supply Volts TMV 28 278 278 278 28 278 278
1081 RMP I MTR Volts VDC OFF OFF OFF -3014 -3014 -3014 -8014
1082 RMP 1 MTR Current Amps OFF OFF OFF 11 11 11 11
1080 RMP 1 Supply Volts VDC OFF OFF OFF -2278 -2378 -2376 -2376
1091 RMP 2 MTR Volts VDC -297 -2963 -2963 OFF OFF OFF OFF
1092 RMP 2 MTR Current Amps 0 10 1010 0 11 OFF OFF OFF OFF
1090 RIMP 2 Supply Volts VDC -23 4 -23 41 23 50 OFF OFF OFF OFF
1320 SAD RT MTR WNDNG Volts VDC -4 8 -425 -3 89 -385 -367 -364 -3 65
1240 SAD LT MTR WNDNG Volts VDC 48 -409 -336 -343 -350 -339 -387
1227 SAD RT -15 VDC Con VDC 149 14 88 1489 14 87 1487 1487 1487
1247 SAD LT -15 VDC Con VDC 15 2 1513 1514 1506 1510 1509 15 10
1056 CLB + 6 VDC TMV 24 2 35 235 235 235 235 235
1055 CLB+ 10 VDC TMV TMV 275 275 274 274 2 74 274 274
Table 4-3 Landsat-1 ACS Attitude Errors and Driver Duty Cycles
Orbits
Function Urnts 13198 13569 14001 15254 16530 17408 17826
1141 Pitch Fine-Error DEG - 040 - 0 08 - 0 02 - 2 13 - 82 - 79 - 80
1143 Pitch Flywheel Speed RPM - 1049 - 2686 - 121 1292 - 4334 - 76 11 - 66 00
1038 Pitch MTR DRVR CCW PCT 496 5 81 455 328 519 330 252
1039 Pitch MTR DRVR CW POT 229 217 510 1965 165 152 58
1030 Roll Fine Error DEG - 225 - 020 - 020 - 252 - 253 - 250 - 286
1127 Roll Rear Flywheel Speed RPM 71578 75692 78208 71405 71675 72687 73439
1126 Roll Fwd Flywheel Speed RPM 641 82 67447 693 31 641 32 64277 64651 64376
1022 Roll Rear MTR DRVR COW POT 001 068 090 13 03 01 0
1025 Roll Rear MTR DRVR CW PCT 426 522 552 417 4 15 445 457
1023 Roll Fwd MTR DRVR CW POT 001 066 072 08 03 02 00
1024 Roll Fwd MTR DRVR CW PCT 415 494 535 424 413 401 411
1035 Yaw Tach RPM -20608 -11650 - 9372 -16952 -20290 -21635 -19931
1033 Yaw MTR DRVR CW POT 0 04 153 184 09 04 08 05
1034 Yaw MTR DRVR COW POT 007 160 176 68 68 62 57
1221 SAD Right Tach DEGMIN 337 337 281 337 338 337 341
1241 SAD Left Tach DEGMIN 2 80 281 2 81 279 2 77 218 276
NOTE Tabulation of these functions began after the pitch flywheel anomaly (stopped) in Orbit 11125
4-4 LS-I
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
LANDSAT-1
SECTION 5
COMMAND CLOCK SUBSYSTEM (CMID)
The Command Clock Subsystem operated nominally in this report period On January 1 1976 during Orbit 17516 the spacecraft clock was advanced by approximately 4 seconds This over-compensahon was adjusted on 2 January during Orbit 17542 by moving the clock back by about 4 seconds Figure 5-1 shows the history of the SC clock drift since launch
Figure 5-2 shows the cumulative drift since launch (155 seconds slower in 39 months) The rate of drift is also shown The rate now is increasing having bottomed out at the end of 3 years at -055 milliseconds per orbit Table 15-1 shows typical telemetry values since launch All are nominal
LS-1 5-1
tn
3500 3800 3793
6 m Ishy
3000 U
2000 -
S SPACECRAFT CLOCK RESET NOTE - EACH JAN 1SC CLOCK RESET
Ej m
U)
1500
-500 +390
81000
r 1 285
1650
N
6
600
O Gil
Noi
Pdl
-3000
-1500
-0920 -
Io
I N0
q m -336
J~0
-250 ~--2000
I I I
m
I- 3 oI Io
-299CURET5EPR
I I
rORBITS
0 1 2 39 6
Figure
7
5-1
8 9
Landsat-1
10 11 12 13 14
(X 103 )
Spacecraft Clock Drift History
15 16 17 18 19 20
L
-0 4
I-
i-
ABSOLUTE DRIFT
U
U
U)
14
161
O -12
-
fl
-08
-06
D DI 0
H
o
I
0
I
1
I
2
1ST YEAR_I I
3 4
I1
5
I
6
2ND YEAR 3RD YEAR I I I Iml I I I ~ I
7 8 9 10 11 12 13 14 15
ORBITS (X10 3 )
Figure 5-2 Landsat-1 Spacecraft Drift and Drift Rate
E__
CURRENT REPORT PERIOD
I I I
16 17 18 19
-04
20
0 0 U U-02
U)
Table 5-1 Landsat-1 Command Clock Telemetry Summary
lnctbon Orbit
No Name Mode Units 35 5099 10182 16987 17405 17824
8005 Pri Power SupplyTemp - oC 3731 3937 3950 38 19 38 17 3763
8006 Bed Power Supply Temp - oc 35 73 38 08 38 38 37 05 37 01 36 99
8007 FrI OC Temp - oc 3114 3198 32 11 31 11 31 14 31 11
8008 Red Oso Tenp - OC 30 47 3139 2142 30 48 3048 30 48
8009 Fri Osc Output - TIIV 0 95 0 96 097 0 97 0 97 0 97
8010 Red Oso Output - TN
8011 100 lHz Pr -Red TAM 311 310 3 11 2 96 311 3 12
8012 10 kliz Pri-Red TAV 3 10 3 07 3 08 3 08 3 07 3 0S
8013 2 5 hz Pri -Red TAW 2 95 2 95 2 95 2 96 2 95 2 9
8014 400 Hz Pri -Red TAW 4 40 4 40 4 40 4 40 4 40 4 4D
8015 Pri +4VPower Supply Pri ClkON VDC 4 10 4 10 4 10 4 10 4 10 4 10
8016 Tied +4VPower Supply Red CION VDC 3 95 3 95 3 05 3 95 394 3 9
8017 Prl +6 V Power Supply Pri CIk ON VDC 6 06 6 07 6 07 6 10 8 09 6 10
8018 Red +6 V Power Supply Red CIkON VDC 6 00 5 94 5 94 5 96 s 95 5 9
8019 Fri -5 V Power Supply Pri CH ON VDC -6 02 -6 02 -6 03 -5 04 -6 03 -6 03
8020 Red -6 V Power Supply Red Clk ON VDC -5 99 -6 00 -6 00 -601 -6 00 -6 00
8021 Fri -23 V Power Supply Pd C1k ON VDC -2288 -2289 -22 89 -2293 -2292 -22 92
8022 Red -23 V Power Supply Red CLh ON VDO -22 98 -23 00 -23 01 -23 04 -23 05 -23 04
8023 Fri -29 V Power Supply Pri Clk ON VDC -29 13 -2916 -29 15 -2914 -2D 13 -2913
8024 Red -29 V Power Supply Red Ck ON VDC -29 07 -29 21 -29 21 -2921 -29 21 -29 21
8101 CRI A -12 V CIA A ON VDC -12 33 -12 33 -12 34 -1235 -12 35 -12 35
8102 CM B -12 V Cli B ON VDC -12 26 -12 26 -12 23 -12 26 -12 26 -12 20
0103 CI A -TV CIU A ON VDC -5 32 -5 34 -5 34 -5 34 - 34 -5 34
8104 CIJB-5 V CIU B ON VDC -5 31 -5 31 -5 31 -5 31 -5 31 -5 31
8105 CUi A Temp CIJ A ON 0c 24 47 24 77 2504 24 41 24 61 24 58
8106 CRUB Temp CR0 BON 0C 24 96 25 31 2545 2481 24 99 2492
8201 fecee~er F-A Temp - 0 4 2867 27 28 27 32 2714
8202 Receiver RF-B Temp - 0C 27 98 28 22 4 4 44
8203 D MOD A Temp - C 25 41 2573 27 98 2679 36 99 86 87
4204 D MOD B Temp - 0C 35 03 35 61 2612 25 00 25 00 24 89
8205 Receiver A AGC Receiver A DBM -96 77 -94 72 -8377 -8911 ON
8206 Receiver B AGC Receiver B ON
DBM -94 74 -84 67 44 4 A
44
8207 Amp A Output Receiver A TINAW 2 31 2 54 2 74 2 81 ON
8208 Amp B Output Receiver B TMV 2 81 322 4 44
ON
8209 Freq Shift Key A OUT Receiver A TANW 1 10 1 10 1 10 1 10 ON
8210 Freq Shift Key B OUT Receiver B TAW 1 10 1 11 4 4 ON
8211 Amp A Output RieceiverA TAW 110 1 12 1 10 1 11 ON
8212 Amp B Output Receiver B TAWV 1 13 113 44 4 ON
8215 D MOD A -15 V Receciver A TAN 5 00 500 5 00 5 00 ON
8216 D MOD B -I V Receiver B TMV 5 00 5 00 44 4 ON
8217 Regulator A -10 V Receiver A TAW 6 40 5 39 8 39 5 39
ON
8218 Regulator B -10 V Receiver B TAMT 5 50 560 ON
Units not muse
5-4 LS-I
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The Telemetry Subsystem has performed nominally m this report period Table 6-1 shows typical telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen m Section 11 spacecraft temperatures reached all-time high values during this period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit Functions 1011 6012 7010 and 12238 remain inoperative
Memory Section 11 continues to be used in the telemetry matrix
Table 6-1 TLM Telemetry Summary
Function Orbit No Function Name Unit 35 5099 10592 15233 16987-1 17405 17824
9001 Memory Sequencer A Converter VfDC 6 35 633 6 33 6 33 6 33 6 33 6 33
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp o 1959 21 06 2130 21 94 20 72 20 00 22 97
9004 Formatter A Convertor VDC 5 99 599 599 5 99 5 99 5 99 6 02
9005 Formatter B Converter VDC
9006 Dig MuxA Converter VDC 1001 10 04 1007 10 07 10 07 10 07 10 07
9007 Dig Mux B Converter VDC
9008 FormnatterDig MtunTemp so 2250 24 89 2500 2355 25 79 26 15 32 03
9009 Analog Mux A Converter VDC 2601 2118 2620 26 32 26 34 26 35 26 35
9010 Analog iinx B Converter VDC
9011 AD Converter A Voltage VDC 1000 1007 1007 10 07 10 07 10 07 10 07
9012 AD Converter B Voltage VDC
9013 Analog Max AD Converter Temp degC 2500 2683 27 49 25 63 26 38 27 25 29 10
9014 Proregulator A Voltage VDC 19 93 1995 19 94 19 98 19 99 19 98 19 99
9015 Preregulator B Voltage VDC
9016 Deprogramaer Temp 00 2200 2250 2253 22 50 23 50 23 35 27 41
9017 MemoryA Converter VDC 6 00 599 600 5 97 5 97 597 6 00
9018 Memory A Temp 00 1751 17 50 1750 17 50 1717 15 95 17 59
9019 Memory B Converter VDC
9020 MemoryBTemp 0C 1768 1763 1751 17 50 16 32 16 15 18 30
9100 Reflected Power (Xntr A) dBm 1195 1232 1238 1137 12 53 12 25 13 10
9101 Xmtr A -20 VDC VDC -1975 -19 76 -1975 -19 84 -19 82 -19 83 -19 82
9102 Xmtr B -20 VDC VDC
9103 XmtrATemp 0C 20 95 21 14 2201 21 98 23 82 24 17 31 92
9104 Xmtr B Temp degC 2169 2195 22 76 22 91 25 30 25 37 33 54
9105 Xmtr A Power Output dBm 2512 2535 2524 2500 24 88 24 86 25 00
9106 Latr B Power Output dBm
Units not USed since prelaunch
REPRODUCBLITY OF THE ORIOINAL PAGE 18 POOR
6-12LS-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS) LANDSAT-I
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired eleven times seven times using the -X thruster and four times using the +X thruster Three -X firings were for initial orbit correction and four -X for orbit maintenshyance The four +X firings were for orbit maintenance
No orbit adjustment was made during this report period
The subsystem pressuretemperature parameters continue to be normal During this report there has been a considerable rise in the temperature of the -Y thrust chamber due to increased sun intensity and sun angle (See Section 11 Also) There is 6485 pounds of hydrazine fuel remaining from an initial preshylaunch load of 6700 pounds Figure 2-1 shows spacecraft ground track drift from standard orbit tracks and the effects of orbit adjustment Table 7-1 is a summary of OAS performance to date and Table 7-2 gives average telemetry values for the off quiescent state In Table 7-2 it should be noted that the first four sample orbits occurred in periods of low sun intensity
Table 7-1 Landsat-1 Orbit Adjust Summary
Orbit Burn Engine FuelI Tank Tank Adjust Ignition Duration + ampa Performance Used Pressure Temperature Axis
Orbit No Epoch (Seconds) (Meters) Efficiency (Lbs) (PSIA) (OF) Thruster
38 1 26 Jul 72 48 12 60 540 75 -X 112500
2 U244 2 26 Jul 72 2500 1975 1034 215 U -X
214446
59 3 27 Jul 72 3180 2391 1015 510 739 -X 23 3445
938 4 29 Sep 72 12 8 98 1100 0039 U2 U -x
003000
2316 5 13 Jan 73 204 154 1060 0071 4894 754 -x 002130
6390 6 25 Oct 73 148 110 1000 0048 4868 739 -x 0004108
7826 7 4 Feb 74 147 112 1018 0048 49059 754 -X 23-27104
11067 8 16 Oct 74 30 -05 i060 0026 49059 740 +X 2242108
11464 9 23 Oct 74 84 -66 1020 0027 49058 739 +x
21 40 00 4 13611 10 26 Mar75 28 -226 101 8 0 01 490 09 725 +X
1939008
14365 ii 19 May 1975 16 -13 1024 0 01 48684 716 +X 2119 008
1 Imtial Fuel Capacity - 67 lbs 2 Unavailable
RFPRODUCITM OF THE LS-I OIMGNAL PAGE IS POOR 7-1
Table 7-2 Landsat-1 OAS Telemetry Values
Function No Name Units 35 5099 10182
Orbit 15254 17004 17394 17854
2001 Prop Tank Temp degC 2203 2286 2328 2162 2203 2269 2407
2003 Thrust Chamber No 1 (-x) Temp
0C 2957 2993 3055 3052 2983 2893 2652
2004 Thrust Chamber No 2 (+x) Temp
0C 3876 4028 3891 3625 3799 3753 3593
2005 Thrust Chamber No 3 (-y) Temp
0C 3455 3441 3609 3845 4635 5005 5750
2006 Line Pressure psia 53929 48687 49061 48687 49051 49083 49455
Wide spread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged Typical orbital range is from 19 to 59 DGC
LS-1 7-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
LANDSAT-I
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 73 85 110 220 11181 11185 and11186 as reported in early reports Adjustments were made in the yaw negative dipole in Orbit 11186 and the pitch positive dipole in Orbit 220 A short roll dipole test was performed in Orbit 11185 with roll dipole returned to near zero No adjustments were made in this report period
The current dipole values are
Pitch +2950 Pole-Cm
Roll -500 Pole-Cm
Yaw -3600 Pole-Cm
Telemetry measurement shown in Table 8-1 shows that the dipoles are holding steady without drift
Table 8-1 MMCA Telemetry Summary (Landsat-1)
Orbits
Number Name Units 35 5099 10182 15254 17004 17394 17854
4001 Al Board Temp degC 1977 1903 1911 1759 1720 1720 1759
4002 A2 Board Temp 0C 2358 2305 2313 2183 2146 2147 2179
4003 Hall Current TMV 348 348 348 347 348 348 347
4004 Yaw Flux Density TMV 311 311 315 402 403 403 403
4005 Pitch Flux Density TMV 313 251 252 252 252 252 252
4006 Roll Flux Density TMV 319 319 320 328 328 327 328
LS-1 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
LANDSAT-1
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch Telemetry values are nominal despite the drift upwards of temperatures As seen in Section 11 spacecraft temperatures reached all-time high values during this
period These temperatures are expected to subside to prior levels as the earths distance from the sun increases in its yearly orbit
Figure 9-1 shows the USB power output history since launch In Orbit 10068 the B Section of the transmitter was substituted restoring full power output to the System Figure 9-2 shows AGC readings at Goldstone for
a constant reference orbit in each cycle since launch The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-1 USBPMP Telemetry Values
Functions Orbit
No Name Units 35 5099 10592 16233 16987 17405 17824
11001 USB EcrAGC DBM -122 78 -13199 -12981 -105 41 -97 18 -9806 -11478
11002 USB Xmtr Pwvr WTS 160 029 154 153 152 1 47 155
11003 USB Rcvr Error KHZ 2179 -2132 -2325 -1801 -1398 -969 -1752
11004 USB Xpond Temp DGC 2292 2264 25 64 2511 26 58 2945 3219
11005 USB Xpond Press PSI 1591 1591 1592 1594 1604 1614 1634
11007 USB Xmtr A -15V VTC -1520 -1520 00 00 00
11008 USB Xmtr B -15V VDC -1520 -1496 -1520 -1520 -1520
11009 USB Range--iSV VDC -1476 -1476 -1458 -1458 -1458 -1458 -1458
11101 PMP Pwr A Volt VDC -1512 -1518 00 00 00
11102 PMP Pwr B Volt VDC -1512 -1482 -1478 -14 75 -1481
11103 PMP Temp A DGC 3044 3023 2660 2609 2850 3186 3690
11104 1PMP Temp B DGC 3164 3167 3342 3710 4229
Units Not in Use
REPRODUCEII1Y OF THE ORIGINAL PAGE 1B POOR
LS-1 9-1
TRANSMITTER-B
I 6 TRANSMITTER-A I
15 808
14
10 3 98 3- 11
0 10 2083
m9
IL 8
770REPORT
6 2 PERIOD
4 3170 4 3 600 1
001
0 I I I I I I I I I I I I 1 I J I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
ORBITS (X 103)
Figure 9-1 USB Power Output History (Landsat-1)
REF ORB 178 RANGE 1060 KM 0AZ 2820 0 EL 590 00
-94
m -90Z 0 0
-802 940 00 C PRIO
C O
-106 CURRENT REPORT
-10 RF 177 SWITCH FROM USBA 0 14 WATTS
RANGE2136TO USBB 1 49 WATTS AZ 970
-118
I I I II I I I I I I I I 0 4 12 I6 20 24 28 32 36 40 44 52 5 60 64 P4R 72 76 8068
CYCLES (OF 2R7ORBITS EACH)
FigrLe 9-2 USE (ink 4) AGO ]Beadings at Goldstone with 30 Antenna Lsndsat-1
9-2 LS-I
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-1
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)
Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Backup Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1 The APU is in Normal mode
Table 10-1 Landsat-1 APU Telemetry Functions
Orbit
Functions Description Unit 7 5098 10182 15254 17004 17394 17854
13200 APU -245 VDC -2490 -2490 -2491 -2490 -2490 -2490 -2490 VDC
13201 APU -12 VDC -1208 -1208 -1207 -1206 -1206 -1206 -1206 Volts
13202 APU Temp DGC 2549 2695 2715 2682 2820 2914 3149
The Power Switching Module (PSM) containing the switching relays for power to Orbit Adjust MSS WBVTR No 1 and No 2 RBV and PRM functioned normally The MSS power circuits have been operatshying on a regular basis throughout this report period The power relay for the BV remained in a failed closed condition since Orbit 196
The Interface Switching Module (ISM) performed all switching normally during this report period
LS-1 10-12
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-1
SECTION 1
THERMAL SUBSYSTEM (THI)
The Thermal Subsystem on Landsat-1 has maintained adequate control of spacecraft temperatures since
launch However temperatures along bay 11 through 17 reached all-time peaks during this report period
The following factors have contributed to the unusual rise m temperature
1 The sun intensity increased from 1 012 of the mean value at the beginning of this report period to a peak of 1 034 during the first week of January Though the intensity declined slightly since then it still has a high value of 1 032 at the end of this report period
2 By 23 January 1976 the sun angle increased to 4620 compared to 4160 for the same time a year ago This increased the intercept of solar flux on bays 11 through 17 which are normally warmer than others
3 The length of satellite day increased more than 2 minutes above the span a year ago This inshycreased the time for heat absorption and reduced the time for heat rejection
4 A possible malfunction of the thermal shutter for bay 14 Telemetry for shutter position for bay 14 has shown a constant value of 5850 since 5 January 1976 although the bellows temperature has risen to about 3160 (orbital average) by the end of the current report period It has not been possible to determine whether this is caused by a telemetry failure or a shutter malfunction
The temperatures are expected to decrease with decreasing sun intensity and sun angle
Table 11-1 shows average analog telemetry values from data recorded on the NBTR Figure 11-1 shows a
typical thermal profile for average bay temperatures of the sensory ring in this report period
No switching of the compensation loads was made during this report period A history of all switchings of the compensation loads is given in Table 11-2
LS-1 11-12
Table 11-1 Landsat-1 Therxnal Subsystem Analog Telemetry (average Value of Frames for Data Received in NBTR Playback)
Function Orbits
NO Description Uit 26 5298 10182 15254 17004 17194 17854
7001 THU THO ST1 DOGC 1952 2085 2165 1948 1945 1979 2052
7002 TH3 TEF2 RED DGC 1860 1995 2060 1662 1827 1841 1862
7003 TIM TH03 STI DOGC 1848 2016 2067 1811 1775 1785 1630 7004 TH43 FI0 TOB DOC 1847 2025 2035 1976 2052 2106 2235 7006 THI TH04 STI DOGC 1839 1971 2038 1786 1751 1761 1791
7006 THM TH05 SI0 DC 1757 1829 1881 1720 1662 1561 1378 7007 OA-X TIHRUSTER DGC 2195 2225 2290 2225 2211 2206 2198 7008 TH TH0 SO DOGC 195 1661 1590 1534 1477 1478 1492
7009 TIM0T16 SBI DOGC 1938 2035 2092 1898 1814 1821 1852
7010 TI-U TH07 ST DOGC 1861 8 8
7011 THM TIOS STO DGC 2178 2277 22 88 2202 2181 2179 2165
7012 THM TH09 SI DGC 2181 2287 2308 2220 2231 2252 2297
7013 TIIM THI0 BEG DOC 1873 1953 1964 1900 1922 1950 2007
7014 THI] THll SFI DOGC 2237 2335 2857 2280 2373 2443 2610 7015 THI8 TH12 SQ DOG 2287 2317 2305 2286 2460 2586 2829 7016 THM THIS STI DaC 2095 2202 2247 2200 2274 2515 2877 7017 1XV BEAM OTR LN DOC 2153 2262 2284 2188 2241 2284 2387
7018 TIM TH14 STO DOC 2038 2140 2198 218 2396 2539 3096 7019 NBR HAD OUTBD B4 DOC 609 586 500 437 376 389 437 7020 THM TIlS SRI DOC 2114 2324 2899 2218 2393 2548 2963 7021 THiM THIS STI DOGC 2073 2290 2368 2164 2286 2378 2682 7022 TH THI SBI DOGC 2022 2276 2356 2147 2176 2269 2488 7023 FHiUTHIS SEC DOC 2190 2429 2519 2247 2357 2420 2544 7030 THU TIMS BUR1 DOGC 1605 1707 1742 1535 1505 1500 1509 7031 TOIM TH6 BUlR DGE 1359 1417 1428 1287 1261 1262 1240 7032 TlUS TH09 BUll DOC 1992 2075 2074 2017 2028 2038 2056 7032 TH1 TH12 BUt DOG 2151 2216 2276 2265 2436 2602 2942 7034 TIM1 THIS U B DGO 1970 2167 2238 2183 2385 2486 2886 7035 THi THIS BUR DOG 2011 2136 22 D2 2054 2191 2143 2217 7040 THAI TH01 TCB DGC 1227 2046 2126 1919 1921 1949 1994 7041 TESM TH02 TCB DGG 1799 1923 1989 1780 1751 1755 1770 7042 THU TH3 TCB DGC 1884 1994 2092 1779 1748 1750 1764 7043 TIMIv T104 TCB DOGC 1895 1994 2020 1860 1823 1823 1844 7044 T181T1E0 TCB DOC 1627 1698 1732 1590 1536 1538 1557 7045 TH1 TH07 TB DOC 18 41 1921 1946 1825 1788 1787 1801 7048 T2211 TM09 TCB DOC 1938 2037 2064 1985 1973 1989 2013 7043 TR THll TCB DGC 2198 2294 2318 2280 2405 2488 2635 7049 TVU TH12 TOE DGC 2192 2240 2235 8230 2421 3573 2954 7050 THU8 T13 TOB DOC 2121 2199 2229 2226 2438 2628 2121 7051 T3 TH14 TCB DOC 2138 2288 2362 2274 2454 2650 3157 7052 THU T1118 TCB DOC 2130 2895 2513 2268 2399 2511 2817 705S TH8T2117 FE DOS- 278 2408 2502- -283 228T 2359 3517 7054 THU TH18 TOB DGC 2002 2220 2808 2104 2056 2125 2179 7060 TI S1UTTER BY 1 DEG 2585 3312 3862 2441 240 2728 3145 7081 TH48 SHUTTER BY 2 DEG 662 865 1328 173 00 058 117 7062 I2M1SHUTTER BY S DEG 1096 2058 3024 1720 1332 1335 1362 7062 TIHU SHUTTER BY 4 DEG 3060 3571 8792 2950 2697 2700 2775 7064 TlIS SHUTTER BY 5 DEG 1503 1625 1500 808 346 519 519 7085 TIUI SHUTTER BY 7 DEG 1714 2464 3196 1450 850 900 900 7067 THAT SHUTTER BY 9 DEC 8826 3844 3950 3824 3826 3844 3B 83 7068 T83[ SHUTTER BY 10 DEG 2468 2868 2721 2608 27385 8250 4069 7069 TIM SHUTTER BY 11 DEG 8986 4688 4896 4697 5310 5894 6245 7070 TIM SHIUTTERBDY 12 DEG 4281 4663 4568 4595 5792 3489 7031 7071 T11 SHUTTER BY 13 DEG 4039 4638 4479 4284 5183 5021 6263 7072 T1I SUTTER BY 14 DEG 8420 8970 4191 8428 4651 5641 550 7073 TIM SI-SUTTER DY 15 DEG 4848 5 74 6479 5515 6916 7395 8215 7074 TIMSHUTTERBY16 DEG 2450 4846 5354 3875 4680 5420 6440 7075 TIM SHTUTTER BY 17 DEG 3906 5496 5188 5106 4699 5221 6868 7076 THU SILUTTER BY 18 DEC 2970 4315 5120 3512 3309 3630 4095
7080 THM QI T ZENER V VDO 819 819 819 819 619 819 819 7081 THI Q2 T ZENER V VDC 840 640 840 24D 840 340 840 7082 THef Q3 T ZENER V VDC 821 8 31 832 881 881 831 8 31 7083 TI182 Q1 S ZENER V VDC 881 832 885 831 832 832 885 7084 TEXV2Q2 S ZENER V VDC 819 819 820 819 819 819 820 7085 THU Q80 ZENER V VDC 815 818 815 815 815 815 815 7090 T2214 Pal MOUNT DOGC 2160 2254 2298 2143 2191 2248 2402 7091 TM IND ATTITUDE DOC 1940 2042 2088 2913 1866 1875 1916 7092 TIM 25V RADIATOR DCC 1665 1722 1747 1655 1723 1767 1868 7092 THU 3 VC CT15M DOC 20 30 2161 2187 2073 2149 2197 2324 7094 T2251WBVTR BOOT DOC 1296 1571 1607 1377 1282 1327 1442 7095 TH WBVTE HAD CT DG 4 81 817 868 698 583 712 756
C) 7096 THMIWDVTR STRAP DCC 1662 1932 1960 1729 1556 1600 1707 7097 Ti WB XT BAY 1 DOC 2056 1952 2137 1697 1732 1755 1823 7098 1H3 WE MAT BAY 1 DOGC 2022 1890 2039 1712 1766 1800 1889 7099 T3I WBVTRPSETS DGC 1860 2055 2106 1845 1769 1790 1849 7100 THi WBVTR SEP 17 DOGC 2131 2366 2423 2202 2139 2268 2461 7101 T131 WBVTR 1 CENT DOGC 2149 2372 2401 2183 1903 1950 2067 7102 MT WBVTR 2 BAY DOC 1746 1892 1932 1723 1677 1697 1755
7103 TIHU WBVTR 2 BY 15 DOC 2100 2816 2882 2173 2228 2338 2634 S 7104 THU WBVTR 2 OTR DOC 1935 2151 2181 1954 1839 1897 2059
7102 FTIT 1H 1TRB SEP 6 DGC 1805 1230 1979 1782 1730 1750 1882
3 S
7106 7107 7108
THIG 31TR SEP 1 TIlM NBTR B1M8CTR THM 8S8 MOUNT 14
DGC DOC DOGC
2082 1937 1918
2295 2L 04 2115
2289 2134 2170
2161 1981 2006
2292 1970 2134
2425 2029 2288
2772 2198 2645
7109 T58 CA -Y THIUSTER DOGC 2221 2380 2469 2440 2733 2926 3420 7110 TIM MSS WBVTRB DOC 1814 2006 2053 1818 1B09 1842 1956 7111 THIU CA +X THRIUSTER DOGC 2030 1992 2122 1807 1860 1886 1948 7120 TI AUHPIT DOGC 1569 849 -1890 968 1951 2564 2176 7131 TEM AX P2 T DOG 106 1589 41 564 1970 14 42 2325
Fulction 7010 became mvrid efter an Itegrated circuit chip failure n the TMP on Orbit 4396
0
Table 11-2 Landsat-1 Compensation Load History
Compensation Load Status
Orbits 1 2 3 4 5 6 7 8
Launch 0 0 0 0 0 0 0
2 0 0 x x x 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 0 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x 0 0 x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x 0 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 0 0
Note x=ON 0 = OFF
11-5LS-1
(+)x AXIS
-)Y W+ Y
AXiSAI
11-6 LS-1
ii-
RING AVERAGE SAY TEMPERATURES SOURCE LANDSAT-If
SCEST PROGRAM ORBIT 17854
AXIS
Figure 11-1 Landsat-I Sensory Ring Thermal Profile
11-6 LS-I
SE CTION 12
NARROWBAND TAPE RECORDERS
LANDSAT-I
SECTION 12
NARROW BAND TAPE RECORDERS (NBR)
Narrowband Recorder NBR-B which was turned off in Orbit 15256 has remained inactive during the entire reporting period
Narrowband Recorder NBR-A operated satisfactorily during tins period and has provided coverage for MSS real-time operations as well as approximately 3-12 hours daily of normal orbital telemetry recording and playback functions
Table 12-1 gives cumulative operating hours for both recorders by modes and Table 12-2 gives typical teleshymetry values
Table 12-1 NBR Operating Hours by Modes Landsat-1
NBR ON OFF Playback Record
A 14122 16570 566 13556
B 11909 12666 476 11433
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-1
Function Typical Telemetry Values - Orbits
3750-No Name 6 3751 10862 15256 15888 17684
10001 A - Motor Cur (ma) Record 19010 18920 18631 19263 19263 1958 PB 18000 17869 18000 NA
10101 B - Motor Cur (ma) Record 19326 19304 19895 19895 PB 18818 18544 18789 2021
10002 A - Pwr Sup Cur (ma) Record 32056 33820 33981 34324 33981 33981 PB 53578 56838 56775 NA
10102 B - Pwr Sup Cur (ma) Record 31762 33605 35000 34675 PB 57078 55363 56750 58051
10003 A - Rec Temp (DGC) 2547 3440 2360 2200 2300 2120
10103 B - Rec Temp (DGC) 2458 2341 2341 2318 1818 1954
10004 A - Supply (VDC) -2447 -2444 -2462 -2462 -2462 -2462
10104 B - Supply (VDC) -2444 -2451 -2429 -2457 -2471 -2471
NA - Data not available
- No data NBR-B out of service
LS-1 12-12
SECTION 13 WTDEBAND TELEMETRY SUBSYSTEM
LANDSAT-1
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS)
The Wideband Telemetry Subsystem has operated nominally in tins report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGC history at Goldstone The scatter of data points reflect variations in the ground
station calibration and readout
RANGE = 1060 KM AZ = 2820
-70 EL = 590
0 00 07E 00 0 00a 0000 00 0 0 0
- 74 0
0 0-7800000
0 0 0 000 00 0 00 0 0 00 0
-82 0 0 0
RANGE = 2156 KM 0 0 -86 AZ = 970EL = 170
-90-CURRENT REPORT PERIOD-94a
0 98
-102
-106
-110
-114
-118
I I I I I I f I I f I I I I f I I
0 4 8 12 16 20 Z4 28 32 36 40 44 48 52 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30 Antenna - Landsat-1
LS-1 13-1
Table 13-1 Wideband Modulator Telemetry Values Landsat-1
WBPA-I
Number
12001 12002 12003 12004 12005 12227 12229 12232 12234 12235 12238 12240 12242
Function
Name
Tmpt TWT Coll Helix Current TWT Cath Curr Forward Pwr Reflected Pwr Loop Str AFC Con Volt (1) Mod Temp VCO +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 VDC Unreg Volt A Inv Temp
(DgC) (Pa) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
26
357 608
4589 4318 3495 -039 2193 269 598 394 528 556
2060
Orbits
1894 1944
3920 3990 649 658
4354 4348 4288 4261 3499 3480 -129 -086 2031 2088 269 265 596 573 394 394 526 518 551 542
2343 2471
2095
3990 6 78
4501 4215 3521 -067 2039
2 62 578 395 512 549
2404
WBPA-2
Number
12101 12102 12103 12104 12105 12228 12229 12232 12234 12236 12239 12240 12242
Function
Name
Temp TWT Coll (Max) Helix Current TWT Cath Cur Forward Pwr Reflected Pwr Loop Sir AFC Con Volt (1)Mod Temp VDC +15 VDC Pwr Sup A (2) -15 VDC Pwr Sup A +5 VDC Pwr Sup A -5 VDC Pwr Sup A -24 5 VDC Unreg Volt A Inv Temp
(flgC) (Ma) (Ma) (DBM) (DBM) (MHz) (DgC) (TMV) (TMV) (TMV) (TMV) (TMV) (DgC)
33
35 38 732
4430 4357 3159 1 11
2170 268 590 397 524 543
2303
Orbits 4096 10602 15233
34 24 3596 29 77 770 767 790
4885 4272 4370 4357 43 47 4352 3279 32 62 3307 -078 -112 -1 05 2088 2150 2178 269 269 265 598 592 581 4 01 401 397
telemetry point defective 552 546 5 44
2290 2380 2366
16987
2349 756
4130 4334 3242 -1 63 2264 268 597 390
556 2126
17405
2626 778
4261 43 52 32 71 -1 47 1895 269 597 4 02
556 1926
17824
23 88 794
42 65 43 49 33 11 -117 2045 267 580 3 97
547 23 44
02
(1) Satisfactory if not zero or -75 (2) B Power Supply not yet used in orbit
SECTION 14
ATTITUDE MEASUREMENT SENSOR
LANDSAT-1
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
Telemetry output of the AMS continues to be normal and in good agreement with the ACS subsystem
Table 14-1 gives typical AMS telemetry values
Table 14-1 Landsat-1 AMS Temperature Telemetry
Orbits
Function Description Units 35 5099 10182 15254 16530 17408 17826
3004 Case-Temp 1 DGC 1892 194211971 1854 1837 1893 1940
3005 Assembly-Temp 2 DGC 1915 1976 1996 1873 1870 1919 1974
IS-i 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-1
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not been operated since its failure in Orbit 148
WBVTR-I was removed from operational service after Orbit 9881 because of high minor frame sync error counts The recorder has remained inactive since suspension of engineering tests after Orbit 10861
Pressure and temperature telemetry values for WBVTE-1 transport and electronics units are shown in Table 15-1
Table 15-1 WBVTR-1 Telemetry Values
Number
13022
13023
13024
WB Functions
Name
Press Trans (PS4
Temp Trans (DgC)
Temp Elec (DgC)
VTII-1
15260
1573
1855
1500
Telemetry Values in Orbits
15700 16530
1559 1566
1636 1736
1384 1475
17810
1573
1950
1538
LS-1 15-12
SECTION 16
RETURN BEAM VIDICON
LANDSAT-1
SECTION 16
RETURN BEAM VIDICON (RBV)
The IBV has not been reactivated since Orbit 196 but it is capable of operation through individual component power switching An assessment of the RBV performance was given in ERTS-1 Flight Evaluation Report 23 July to 23 October 1972
LS-1 16-12
SECTION 17
MULTJPECTRAL SCANNER SUBSYSTEM
LANDSAT-1
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The Multispectral Scanner Subsystem operated nominally in this period without incident Figure 17-1 shows the number of scenes imaged at each geographical location in this quarter Figure 17-2 shows the number of scenes imaged in the first 3 years of operation Figure 17-3 shows the number of scenes imaged after the 3 year period and before the start of this quarter The sum of these three maps shows the number of scenes imaged since launch In these maps only those scenes received by US ground stations are shown Scenes transmitted to Canada Brazil and Italy (34 of total) are not shown
Table 17-1 shows typical telemetry values since launch The higher temperatures shown in Orbit 17824 reflect general spacecraft temperature increases due to the earth-sun distance approaching its lowest value but a new operating procedure adds greatly to the reported value even though there is no real change in equipment temperature The temperatures reported are computer-derived average temperatures for the NBR on-time Until recently the NBR was ON throughout the orbit so that with MSS ON only 8 of this time averages were relatively low Recently to prolong its life the NBR is ON only to span MSS operations Now with MSS ON about 70 of the NBIR ON-time averages are much higher With tins adshyjustment all telemetry values are nominal
Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Sensor 4 has declined most (22 ) since launch This is twice the average sensor decline Sensor 13 remains apparently stable at its elevated level - 13 - since launch
Line length history is also shown in Table 17-2 and remains satisfactory
Sun Calibrations performed every two weeks continue to show nominal performance
LS-l 17-12
----- ---
1AII --4 ~
11~
IJ2Iil~~-4~~~~~~~~~~i T VH HF r
7 ~
loc Al 111Tl Hi i 0
RF
----- ---- -- -----shy
x I
I
0
IN - UI-~-
I M J
1shy-- -- ---
P EIa gI I -----nI- - -
CC---shy
~ ~~ri~~ijfrnjVL--------I
-~- I11shy---
Ti vols
~F IN 4
J
--- ----- ----shy
-Kj HI It [-----r----L---- I F F h----~ 0 M r - I-
-~ - i-----
Figure 17-2 Computer Map of MSS Scenes
for First 3 Years Operation - Landsat-1
QIUNM4 PAGE ISPOORroi~olf EU~
RERODUCEIBUM OF MORIG4NAL PAGE IS F00
I I I
Figure 17-3 Scenes from End of Three-Year Period to Start of this Quarter - Landsat-1
LS-I 17-78
Table 17-1 MSS Telemetry Values
Function Telemetry Values in Orbits No Name 20 5060 10587 15233 16987 17405 17824
15044 FOPT 2 T (DGC) 1746 1984 1975 1815 1862 1840 2014
15046 ELEC CVR T (DGC) 1937 2183 2196 2020 1976 1866 2149
15048 SCAN BUR REG T (DGC) 1635 1977 2048 2094 2099 2029 2363
15050 SCAN MRDRCOIL T (DGC) 1594 1930 1978 1921 1985 1959 2264
15052 ROT SHUT HSG T (DGC) 1691 2007 2023 1874 1889 1884 2052
15043 FOPT 1 T (DGC) 1767 2001 1990 1835 1884 1862 2033
15045 MUX PWR CASE T (DGC) 2119 2203 2387 2692 2423 2250 3084
15047 PWR SUP T (DGC) 1741 2000 2021 1983 2000 1934 2188
15049 SCAN 1MR DR ELC T (DGC) 1612 1941 2023 2116 2110 2040 2383
15051 SCAN MR HSG T (DGC) 1560 1905 1949 1840 1932 1878 2200
15040 MUX -6 VDC (TMV) 403 403 398 402 403 403 407
15042 AVE DENS DATA (TMV) 167 213 205 228 210 178 208
15054 CAL LAMP CUR A (TMV) 1 12 1 12 112 112 112 1 12 112
15056 BAND 2 + 15 VDC (TMV) 510 510 504 510 510 510 510
15058 BAND 4 + 15 VDC (TMV) 510 510 504 510 510 510 510
15060 + 12 -6 VDC REG (TMV) 482 502 497 502- 502 502 502
15062 + 19 VDC REC OUT (TMV) 480 490 497 503 503 503 503
15064 BAND 1 HV A (TMV) 510 516 512 512 512 512 513
15066 BAND 2 HV A (TMV) 450 452 452 450 450 457 452
15068 BAND 3 IVA (TMV) 460 462 462 462 463 462 462
15070 SHUT MOT CON OUT (TIVIV) 243 244 247 251 250 250 250
15041 SD CONV REF V (TMV) 593 593 587 593 593 593 593
15053 SCAN MIR REG V (TMV) 442 451 451 461 461 460 460
15055 BAND 1+ 15 V (TMV) 497 497 492 497 497 497 497
15057 BAND 3 + 15 V (TMV) 500 500 494 500 500 500 500
15059 -15 VDC TEL (TMV) 502 502 502 502 502 502 502
15061 + 5 VDC LOGIC REG (TIMV) 482 481 477 476 482 481 477
15063 -19 VDC REG OUT (TMV) 343 339 350 358 358 357 357
15071 SCAN MR DR CLK (TMV) 193 197 198 200 200 196 197
LS-1 17-9
Table 17-2 MSS Response History Landsat-1
Quantum Level for Selected Work (0=Black 63=Whlte)
Quantum Level
1st Year----- shy 2nd Yr-- -shy 3rd Yr-- i---4th Yr Change Tins Since
Band Sensor Launch 2-4 Quar 5-8 Quar 9-12 Quar 13 Quatr Quar Launch
1 43 39 39 38 37 37 -14
2 44 39 40 40 39 39 -12
3 43 38 40 40 39 40 -6 4 43 38 39 39 38 38 -12
5 41 36 35 34 32 32 -22
6 43 39 41 41 40 40 -7
7 47 43 43 42 41 41 -13
8 46 415 41 41 40 40 -13
9 47 44 425 42 41 40 -15 2 10 46 42 415 41 41 41 -11
11 47 425 42 42 41 41 -13
12 45 42 425 42 42 42 -6
13 46 46 49 51 52 52 +13
14 44 42 42 42 42 42 -5
15 45 425 42 41 41 41 -9
16 40 375 375 37 37 37 -8
17 42 39 40 40 40 40 -5
18 44 40 405 41 41 41 -7
19 28 28 27 25 23 23 -18
20 25 26 25 23 21 21 -16
21 26 27 265 25 23 23 -12 22 23 23 22 21 19 19 -18
23 22 225 23 21 21 21 -5
24 24 235 24 23 22 22 -8
Line
Length 3221 3219 3217 3216 3216 1314 -02
LS-1 17-10
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-1
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
The Data Collection Subsystem was turned OFF after Orbit 12690 on 19 January 1975 and has not been used since
The DCS operated without anomaly throughout its operational period Only Receiver 1 was used
LS-I 18-12
APPENDIX A
LANDSAT-1 ANOMALY LIST
APPENDIX B
LANDSAT-1 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT-i
SPACECRAFT ORBIT REFERENCE TABLES
PROM JULY 1975 THRU DECEMBER 1976
ORBIT 14953 THRU 22621
FlIGHT DAY 1073 THRU 1622
LS-1 B-12
LANI)SAT-I
JULJ I97-
I I GMT I FI 1W-T FPACECRAFT I REFRCF I REF I CYCLr I I DAT I DAO I C-AY I BRBTTS I ARRITS I DAY I Mil I
I w ------------------ --------------------------------------- I
1 I 1x21 i10 73 1I14954-141AI 29 4 1 1 i 601 I P I 13 I io74 I 4967-14-180 41- 56 1 41 60 1 I - I i14 I 75 1 149R1Lq94 1 57- 70 1 = 60 1
4 1 185 I inY6 I L99-15noR 1 71- 84 1 6 I 60 1 - i -1-1X6-1ji077-- -i~ n ~ r) )PI - 98 1 7 1 60 1
I 6 1117 1 o7078 1023-15rl5I qq11i I Ai 60 1 I 7 1A8 ji79 1i036-1F049 11-1p5 I qI o I I i i19 iono I 19o5o-1506q I 126119 1 10 1 60 1 -9 i o I i I irO64-il~n77 I4n-155 I 1-081 I iI 1
i ) I 191 1 i02 I 107A-15ncl 1 154-167 lp1 6 1 1 1 192 I 08rJ3 V-1SC09P-4Ir 1o I I 1AR ft1amp1 I I1 I1 60 I 1 I 193 1 1064 1 19105-15119 I 1AP-195 1 14 1 60 1 il I I94 1 o 5 1 1r120- 15 1 1 IA-PO9 I T i 60 1
I 14 I 195 1 i0 6 i 91j34-15147 I 21n-P3 I I1 60 1 1 1cI 196 1 1087 1 1914Xs-1F916 I 2P4-PS7 1 17 1 60 I 1 16 1 197 1 088 1 916P-15175 I 23A-1 I 18 60 1 r- 7 1 198 1 i099 I 1rl 7-151A9 i 1- 14 1 1 1 61 1 I 18 1 199 1 jO9O I lR190-15l20 I 1q- p8 1 P 1 61 1
1 19 I P00 1 1091 I19204-15217 I P- 41 1 q 1 61 1
Pt I 201I i092 1 19219-1551 1 41 56 1 4 1 61 1 I I po2 I io93 I 1923P-15I 45 1 97- 70 1 9 1 61 1 PP I P03 I 1094 I1r241-lrpr8 1 71- i4 1 I 61 1
I PSI -1 P04 I- 1095-1 -19P60-1 $P71 I g9- 9AI 7 1 61 I 1 14 1 05 I i096 1 9274-15PA6 I 9j-11i I h 1 A1I I I P06 1 1097 I 1li287-1513n I I1 1P15i 9 1 61 1
1 I )7 I 1098 1 1c301-114 1 1A-119 I 1) 1 61 1 t P7 I 2O I i099 -1 1531515P I 1n-153 I 11 i 61 1 I P6 I Po9 I O I 19329-15I P 1 194-167 I 12 1 61 I
FPf-2 Dt 101 -- 1ti l94 -q-11 A r 168-IRI I 13 1 61 10-f I I 2I I I O 19357-15120 15P-199 1 14 1 61 14102 I I -I I R12 1 i103 I 19371- 54R 19-09 I 1 1 61
RFPRODUC]Lxr OF THEQIMNWAL PAGE IS POOR
s-i B-3
----------------------------------------------------------------------
LANDSAT-1
-AUG s1 979i
--U -- W
I I GMT I Fl ItHT I SPACECRAFT I REFFRFCF I REF I CYCLF I
R-R3ITS -1 DAY i Nfl 1I -DATFVIDAYI_DAY -1 -- RBTT F
I 13 1 I 1938-419 I 21n-PP3 I 16 I 61 I -i0o
I P14 I i10 5 1 i99-141P I 2P4-P17 I 17 i hi I
ilt I5 i16 -1 I94-154P)61- 249)51 1 19 1 61 I 62 I
4 216 I j107 I 19427-1544n I 1- 14 1 i - -T - jg- 2- - 62 1C108-T--f-4 41IF
- 12 1- 1- 109 1 9 -15 46 - p42 1 a 62 1 R--i P V7 1- F
-b I 7 1 Pi I 1 l0 I I 1I9i 4 - 96 1 6P I
-A I PPO I ill R 1 5 1 62 1II48315496 1 7-70 6 F1- 9 -I P11 -1 1 --- 497-159 -71- -1 6 1-2-I g4
I 2 x 17 62 1I o I P2 1i 13 1 T511-15 PL 62 1-I T--VFP~3 1-1 r4r--55 59r47 qqJ-1A I 1 9
IP I 24 I iii5 1 1c0538-15991I jj-5 P 9 2 1 13 25 ilb -r 52-965 I 1276-11R9 1 10 b I
1 I4 I 1 1 175-1679 I 14n-152 I 11 62
i is 1 P7 I Tin3 I 780-15R93 1 154-167 1I1 I 62
1 16 I P28 I i119 I 191794-1907 I iA--1At 13 62
r--i7 --f-P9Tl I 2om 60-tRA21 -1- -1A-135 1 14 1 62 1
IS I P3 i 121 I 1962P2-6l93I 19AP9 I is15 62 1 1 1 62 1 -19
-1 - f P-I -1 19636-I5649- I--2n-P23 16 1 62 11Po 1 P-32 Ii123 I19l650- SAs3 Ipp4-Pq7 1 17
1-1l--I 143 11241 -19664-156A77 I 21R-PrI IP IF 62
1- 14 1 1 63 1IP I~ 1 115F6781j5A91IiPq4 12 5 6
-r- q --rP4 b-ii2 --Tr 1969P-97S5r T1 P8- 1 2 j 63 1
1 4 IP~6 1i127 I I c706-tS71 91 Pq- 42 1 14I 631
1S I P4 7 1 i128 I1972o-15733 1 41 56 1 41 63 1
1 PA6 1 238 1 i129 11734-19747 1 57- 70 1 C 1 63 1
1 P7 I P39 1 1130 1 i74N-lS7A1 1 71- 84 1 6 11 63 I
1 P^ 1 P40 1 i1~l 1 1976P-1r779 I 69- 98 I 7 1 63
1P9 -1 P41 I i132 -19776-157R1 g9-111 I R 63 1
1 ROl 1 242 1 i13 19789-ISAp I 112125 1 9 1 63
I I P43 1 jiS4 1 19Sol-15R16 I 126119 I In I b3 I
LS-1B-4
----------------------- --------------------------------------
----
- - LANDSAT_-
DIrI GM I FiIGHT I SPACECRAFT I REFERENCE I REF I CYrLE I _I DATF I DAY L D A YmA k_A_ITSYI DAYI_ t__-__LRI]t5___pound
J__L_44 -_l_ 135_ I _1517-15830 -1 14o-153 I 11 1 L3 I 1 9 145 I ujjb i 1b831-15644 I 134-167 I 12 I k3 I 2_ Ii 1_ -- 13 - 3 Lshy3_5825-5 5 _[t-L 6 -1 j1 -1 1
I 4 I 247 1 1138 1 15859-15872 I 182-195 14 I 3 I 1 5 248 I 113 9 L-15873-15jA__LLP9- _ L3
b 1 249 I 1140 15887-15900 I 21o-23 I 16 1 r3 I I 7 1 POI iLJ_59O1 b9A-__IL 2A_L1 _ t 8 1 P51 I 1142 1 15915-15928 I 23R-251 I 9 1 3
L2-_2-I- 1143 I 159_2H-I_ 42_1L_ _1_1_---_J AL s-I 10 I 3 1 I 11 4 15943-15956 I 15- 28 I 2 I k4 I i 1i 2541_L I-5 -45w_01 -29 _7970-2_ J_ 3 a _ ____
I 12 1 265 I 1146 1 15971l-1b984 I 43- 56 I 4 I 4 I I 13 2SQ_ _7_j_ 59 85 1 598 Ii7 7 5 amp4_L_ I 14 I 257 I i148 1 15999-16012 I 71- 84 I 6 I 4 I
1 3 1 6 02 6 - amp4 16 1 PS9 I i110 I 16027-1b039 I 99-il I 8 1 A4 I IbL_ 25_ I __ 1 L1L__60 6 - 1_8H 98 ] - - 1
1 6 0531 17 I60 1 11 L604-0- 1 11-125 [ 9 ia-L
I sI 261 I152 16054-16067 I 126-139 i 10 I e4 I 19 I _1153_j5606S-16081 110-153I_ 1 1 416 20 I P63 I i154 1 16082-16095 I 154-167 I 12 1 A4 I
fi 2L _C L 55 il i_6 r-619_If _6jii 8 L __1IL _
22 j 265 I 1156 1 16110-16123 I 192-195 1 14 4 Ishy1 53 P66 1 1157 1 1j12-16137 i 96-209 I plusmn
P4 P67 I I5S8 11613s-16151 I 210-223 I 16 I 44 1 17I5t__plusmn__ 1 1159 16152-16165_j 224-237 I L Al
I 2h 1 269 1 1160 1616b-16179 1 238-251 1 18 4 I I 27 t-ZQL 11 01 16190-16193_- I -_-_-14 L__ L ___- 5 -L -
I 28 I 271 I 1162 I 16194-16207 I 15- 2 I 2 I 45 I 51 29 [ 272 I 163 _ j1620Q-16221 I 29-4 J L
30 273 1 1164 1 16222-16235 I 43- 56 I 4 I s I
LS-I B-5
------------------------------
LANDSATt
eCTso 975
I I GMT I Fi IHT I SPACECRAFT I 4EFERENCE I REF-i CYrLE I I DATF I DAY I DAY I 801TS I 6RBITS I DAY I N _ I ------------------------------- w----------------------------shy
5I I I 2LjJ U i_1623ob1624 9 I_ - 5 7 Q_ I-___L 45 __ I 2 275 I i1b6 I 16250-16P63 I 71- 84 1 6 1 45 I
3 _ IL7__L_ 16264-16277 ___ 7s 98 -L-- ZL__25 -I 4 1 277 I 1168 I 162 76-16290 1 99-111i I isI 5 I
I S i9__i7 1plusmnW 62 9 1-tbAD 4 I It)-2S 1 9 1I I 1770 t1633b-16318 I 126-139 I 10 I amp5 I
I 7 I P8__j il71 I 16319-16332 I 14olQ153 j -L- I J 8 1 I 71 1 12 1 cS17333-15346 14-167 9 1 P82 1 i7s I 16347-1360 I 16A-161 I 1 55
1 10 288 I 117 16361-1637 18i-195 14 I 5 1 I Ii I 284 1 1175 11 37 5 -16 388 I 1 9 62 09_J I_
285 1176 1 16389-lb02 1 210-223 1 16 5 I 13 1P6 1177 1 16403-16416 1 224-237 _17 1 5 __I
1 14 1 287 1 1178 1 16417-16430 238-251 -18 51 45-5 1i 288 1179 1 16431-16444 1 1- 1 j 1 amp6 1
1 16 1 2b9 I 1180 1 16445-16458 IS 28 2 46
1 17 1 P90 I ild 16459-1b472 1 29- 42 1 3 46 1 18 1 291 I 12 16473-16486 1 43- 56 1 -4 6 1 1 19 P92 1 1183 1 16487-16500 1 57- 70 5 6
20 293 T 1184 1 16501-16514 I 71- 84 1 6 A6
1 21 1 294 11185 I1b5b-16528 1 85- 98 1 7 i 6 12 1 295 1186 I1659-16541 I 9q9jj 1 8 A6 ishy
1P3 1 296 1 1187 1 16542-16555 I11P-125 9 6 1 24 297 i 1188 16556-1656 I 126-139 1 10 1 A6 1
25 198 I 1169 1 16570-16583 I 140-153 1 i1 1 A6 I 126 1 P99~7~1150 ij-~7 s4P 2i I7 300 I 1191 j 16596-16611 1 168-181 13 1 A6
1 PF 301 I 192- 16b12-lb25 I-I 295 I4 67 F 29 1 02 1 1193 1 1662b-16639 1 196-209 15 1 6 1 3 1 3 1 IT
7 6 0 6653 -g1 21F-823-1 -167- -4 I 21 1 3o4 I 1195 1 16654-16667_i 224-237 17 1_ 6 Ishy
B-6 LS- I
ANUSATl -
I GMT I SPIGHT I REFERENCE I REF 1 CYrLE IsPACECRAFT I DATF I DAY DAY -- S1 I I _II QBI _5-1_8aBITS DAY Ns --------------------------w-----------------------------shyLt-_L 305-L I96__Lh 668-1b681 J-238-251 L 18 1 46 I
P I lob I j197 I 16682-1669E I 1- 14 I 1 1 7 I u_-- 1_i_19__I_ 1b9616709 1 -15 28 j_ 2 1 7 -
S 4 308 i 11i 1671j-16723 I 29- 42 I 3 1 7 I 1 5 1 p09 I 1200 16 7 2-1737 L__3_56w L 7L_ I b 310 i 1201 1 16738-16751 I 57- 70 1 5 1 I I 7 311I 1202 1 16752-6b76S___ 7- 84 1 6 7 I 1 312 IPi2O I 1676t-16779 I 8 - 98 F 7 i 7 I I 9 1131 i204 1 16790-16792 jq -ji 8 L e7 L I 10 1 314 I 1205 1 16793-16806 I 11-125 1 9 A7 I 11 1 315 I l2Ob 1 16807-1620 1 126-139 1 10 1 A 7
I 1 i 316 I i207 i 16821-16s34 I 140-53 F I I 1 I 7 shy- 3- 112 -_208LA6835-1Mgt 4ALi154-167 1 12 1 7
j+ I 31b 1 1209 1 1684 9 -16662 1 lbS1li1 1 13 j 7 L151_ 1 _I-12Q__ j16863-1687b I 18S-195 1 14 1 7
1 16 320 I 1211 16877-16s90 I 196-209 1 15 1 7 1 17 1 321 2112 ____2_-223 16 L1 4116891-1b- 7 I 1amp 322 I 1213 116905-16918 I 224-237 I 17 1 7
2 3 8amp2 5 1_I 19 1_32231 __1_2-14 121J - __ I 7 -
Po 1 324 1 1215 j 16933-16946 I i- 14 I 1 I k8 j2j 3 i 1i216 171 2--rA_- 8
1 22 326 1 1217 16961-16974 1 29- 42 I 3 I amp8 1 23 t32aULj__2tj8tS96Z7- 16988L_ 443w S Lji8
24 1 328 I 1219 t19 89-1 7 002 I 57- 70 I 5I 8 1j2j 12 9 J12iQ-_ I70031lbI -L~ A4 -- 6 48_L 1 96 1 330 I i221 I 17017-17030 I 85- 98 7 I 8 I
27L1 31 1i222 jj7031-7043 1 99-111 pound-B A pw I33R I 1223 I 17041 -17057 I 112-125 I 9 I 8 I
I P9 333 1 1224 1705-17071 I 126-139 10j--8 I 30 I 334 I 1225 I 1707-17085 I 10o-153 I I i 8 I
B-OF THEEPRODUOIBm1ITY OIINAL PAGE IS PQQI4 S-1
------------------------------------- ---------------------------
____ ____ _-___LANSATtL
DECv1975
I I GMTI Fi luUT I SPALECRAFT I REFERENCE I REF I CYrCLE I
I DATF I DAY I DAY I BRBITs I 8RBITS I DAY I NA I -I
I 1 335 I 1226 1 17086-17o99 1 15167 1 12 1 8
2 336 I1227 I 17100-17113 1 lb8-181 I 13 1 8 1
1 3 1 337 I 1228 I 17114-17127 I 182-l95 4 1 -1shy1 4 1 338 I 1229 I 17126-17t41 196-209 I 15 S I
I 5 1 339 i 1230 1 17142-17155 1 210-223 1 16 1 8 I
6 1 340 1 1231 I 1715t-17169 1 224-237 1 71 8
1 7 1 341112 17170-17t83 1 23A8251 8 I A8 1 I 342 I j233 714-17137 i - j 9T j4 1 I
1 9 I 343 I 1234 I 17198-17211 I 5- 28 2 1 49 1
0 34k I 1235 I 17212-17225 1 29- 42 1 3 9 I
I 11 345 I 123 6 I 17226-17239 43- 56 1 41
T 1-2 1 346 1237 177-52iS)7T - - A 1 13 347 I 123 8 17254-17267 71- 84 1 6 i9 1
1 348 1i 239 11726-17281 I 8r- 98 7 1 A9 1
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6i5S 238-5 27 301 I 557 I 21702-21715 I 1- 1 1 u7 I 28 102 155 8 1 21716-2172 I 15- 28 2 i Rpound1 29 303 1559 1 21730-21743 I 29- 42 3 I 3o 304 I5b9 1 2174-2157 1 43- 56 44 i shy31 305 1 1561 I 21758-21771 I 57- 70 5 a7
I 26 30 I 2I6Sa2i~b 1 R8i
B-is LS-1
----------------------
--------------------------------------------------
-----------------------------------------------------------------
GMT I FI IGHT I SPACECRAFT I NEFFRENCE I REF I CYrLE I I DATF I DAY I DAY I 8_RITS I 8R-BITS I QAyI_- shy
-L _I I I 3Q6LL I__f____t 7 2r217 8 5 1i 71 __4 -__ -__ I7
I P 1 307 I 1563 1 21786-21799 I 85 98 I 7 7 I -vL 3 L23-08 L_1-5 6 4_L 2_1800-2112_L___9-111 J -_
I 4 1 30 I 1b5 I 21813-21626 I 112-125 I 9 I 7I I 5 I 31_L1827-21A40 1 126-139 1 10
I 6 1 311 1 1567 I 21841-21854 I 140-153 I 11 I a7 I I 7 1 12 1 b J 2 -18521968[ -167--- L 12 I ___7 I5415 --I 11 313 15b9 1869-21AR2 I 16R8181 1 13 1 u7 I W t5t 1 70 1 2188 3-2 L_ -14 i7_j596-1-182_1 -2 I 10 I 315 1 1571 1 21897-21910 I 196-209 I 15 I w7 I
-1 L1 I 316 t__72_J__21911-2192 1_21r2P3 - l I __s7 I-I 12 [ 317 1573 I 21925-21938 I 224-237 I 17 I a7 I 1j1 3_ SL _7m_-l__21239-219gb2 1_ 2_- 5 __L___8 j 1 14 I 319 1575 I 21953-21H66 I 1- 14 1 I1 8
_21 9 6 7 __-L _20- 1_57 _ 2 19R0 1 15 - ns I 1h-I 177 I 3
JL M - _ 28 2 i -- 1 321 15 i 21981-21994 29- 42 i I R8
I 17 I 322 L 8 -L 2199b-22a08 L 43- 56 x8 1 18 I 328 1579 I 22009-22022 I 57- 70 I 5 as 1 19 I 324 I i580 _L22023-2o36 1 71- 4 fL b _L 1 20 1 321 1581 I 22037-2 050 I 8S- 98 I 7 1 28 I 1 21 1 326 -L i52_ 22051-2206jZ j_3_-11 i8_ I p I P I 327 -1 583 1 22064-22077 ( 112-125 I 9 1 I-I 23I 328 I 1584 I 22078-2_209 Lj2A- 39 10_j2I R8 I I 24 1 329 1585 I 2209P-22105 I 140-153 I 11 I a8 I
1 26 1 331 1 i587 I 2212U-22133 I 168-181 I 13 1 a8 1 27 1 332 L 568 I 22134-22147 18_-195j_14 _ I PS 1 333 1 689-1 2214-8-22161 I 196-209 I 15 I 8 1 29 I 339 1 1590 I 22162-22175 I 210-223_--- -16 1 8__I I 30 1 335 I 1591 I 22176-22189 I 224-237 I 17 1 as
LS-1 B-19
_ _ _ _I-___T -_
DEL 1973Z6
I I GMT I FIIUHT I SPACECRAFT I REFERENCE I REF I CYrLE i I DATF I DAY I DAY I SRIlTSj fRBITsIAY _
1 1 33 1 i592 1 22190-e2203 1239-251 118 1 8-j I 2 I 337 I 1593 I 2220-22217 I 1- 14 I 1 r I
15941 3 1 338_1 122216-222 3 1 -IS- 28- L~ A~ 1 I 339 1-595 j 22232-22P45 29- 42 I 3 I I
S 340 1 596 1 2224h-22259 1 3- 56 1 4 1I L_ I h 341 I 597- Fa2260-22273 I b7- 70 1 5 1
1 7 1 342 1__j5 9 8 1 2P274-22287 71- 84 1 6 1 9 i343 1 99 I 228-2231 I 89- 98 7 1 - 9 I
1 9 1 344 1 1600 I 22302-22314i 99-111 8 R9 10 13 I 22315-22328 112-125 9 sZ9t601 1 1 1 11 1 346 1 1602 1 22329-22342 1 126-139 1 10 1 12 347 I 22432235b i q3-153 i11 a160 3 i
I 13 1 348 I 1604 I 22357-22370 154-167 1 12 1 k9 I I14 I 4IIlamp 23123I163-18 1 13 1 P9 1
1 15 1 350 1_60 6 1 22385-22398 1j18P-195 1 14 R9 16 1 351 1 1607-I 22399-2212I 196-209 15 17 1 352 I 1608 I 2P413-22426 1 210-223 1 16 Z9 a18 ~3I~ I1609 2-4-D 2 -4oI 47 p17I 19 354 I 1610 22441-22454 1 238-251 1 18 1 s9
I-1 0 I135b 1611 I 224b b-224 68 I 1- 14 1 1 1 o 1 21 1 356 1612 I 22469-22482 ( 15- 28 1 2 1 00 I22 I b3 I2243-22496 29- 42 3 1 0 I-I 3 358 1 614 I 22497-22510 1 43- 56 1 4 no
2 1615 1 22511-225241 57- 70 1 5 a nO 124 IPS 360 i616 1 22525-22538 71- 841 6_ OI I2h 361 i61T - 1 22534-22552 85- 98 7 0 I
27 I 362 11618 22553-22565 1 99-111 I 8 oO I 1 28$ 6i -1i 61-9 1 256C-22579 1I ju25-- I9--l 0o
29 36 1620 1 2580-22593 I 12 6 -13 9_j 10 1 0 I 30 3 b I b21 22b94-226 If 4j- jS3 Ill I 0 I 31 1 366 1 1622 I 22608-22621 154-167 I 12 I 0
B3-20 Ishy
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
None issued
LS-1 C-12
LANDSAT-2
TABLE OF CONTENTS
Section Page
INTRODUCTION vil
1 SUMMARY - LANDSAT-2 OPERATIONS I 1-i
2 ORBITAL PARAMETERS 2-1
3 POWER SUBSYSTEM 3-1
4 ATTITUDE CONTROL SUBSYSTEM 4-1
5 COMMANDCLOCK SUBSYSTEM 5-1
6 TELEMETRY SUBSYSTEM 6-1
7 ORBIT ADJUST SUBSYSTEM 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY 8-1
9 UNIFIED S-BANDPREMODULATION PROCESSOR 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM 10-1
11 THERMAL SUBSYSTEM i-i
12 NARROWBAND TAPE RECORDERS 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-i
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 WIDEBAND VIDEO TAPE RECORDERS 15-1
16 RETURN BEAM VDICON 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-1
18 DATA COLLECTION SUBSYSTEM 18-1
APPENDIX A - LANDSAT-2 ANOMALY LIST A-I
APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES B-I
APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD C-1
LS-2 ln
LIST OF ILLUSTRATIONS
Figure Page
2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track 2-2 2-2 Local Mean Time of Descending Node 2-2 2-3 Predicted Limit of Descending Node 2-3
3-1 Landsat-2 IA (Midday) Degradation vs Days 3-2 3-2 Landsat-2 Midday Solar Array Current 3-3 3-3 Landsat-2 Actual fl and 7 (Paddle) Sun Angles 3-6 3-4 Predicted Beta Angle Predictions for Landsat-1 and Landsat-2 - 1976 and 1977 3-7
4-1 Landsat-2 Gating Frequency vs Time 4-2 4-2 Landsat-2 Gating History 4-3
5-1 Landsat-2 Drift History 5-2 5-2 Cumulative Drift Since Launch 5-2
9-1 USB (Link 4) AGC Readings at Goldstone with 30 Antenna - Landsat-2 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile 11-3
13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 301 Antenna - Landsat-2 13-2
15-1 WBR-2 Tape Usage Thru Orbit 6096 15-4
17-1 Computer Map of MSS Scenes This Quarter - Landsat-2 17-5 17-2 Computer Map of MSS Scenes Since Launch - Landsat-2 17-7
18-1 DCS Message History 18-2
iv LS-2
LIST OF TABLES
Table Page
1-1 In-Orbit Payload Systems Performance Launch Thru Orbit 5070 (12176) Landsat-2 1-2
2-1 Landsat-2 Brouwer Mean Orbital Parameters 2-1
3-1 Landsat-2 Major Power Subsystem Parameters 3-4 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received
in NBTR Playback) 3-5
4-1 Landsat-2 +20 Pitch Position Bias Summary 4-1 4-2 Landsat-2 Subsystem Temperature and Pressure Averages 4-5 4-3 Landsat-2 ACS Voltages and Currents 4-6 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles 4-6
5-1 CommandClock Telemetry Summary Landsat-2 5-1
6-1 Landsat-2 TMP Telemetry Values 6-1
7-1 Landsat-2 Orbit Adjust Summary 7-1 7-2 Landsat-2 OAS Telemetry Values 7-3
8-1 Landsat-2 MMCA Telemetry Values 8-1
9-1 Landsat-2 USBPMP Telemetry Values 9-1
10-1 Landsat-2 APU Telemetry Functions 10-1
11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback) 11-2
11-2 Landsat-2 Compensation Load History 11-4
12-1 NBR Operating Hours by Modes 12-1 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2 12-1
13-1 Wideband Telemetry Subsystem 13-1
14-1 Landsat-AMS Temperature Telemetry 14-1
15-1 WBVTR Telemetry Values 15-1 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry 15-2 15-3 Function Values by Mode Landsat-2 VBVTR-2 Telemetry 15-3
16-1 RBV Telemetry Values 16-2 16-2 Camera 1 (Blue) Telemetry (Values in TMV) 16-3 16-3 Camera 2 (Yellow) Telemetry (Values in TMV) 16-3 16-4 Camera 3 (Red) Telemetry (Values in TMV) 16-4
17-1 ISS Telemetry - Landsat-2 17-2 17-2 MSS Response History - Landsat-2 17-3
18-1 DCS Telemetry Values 18-1
LS-2 vw
INTRODUCTION
This is the fifth report in a continuing series of documents issued at launch and thereafter quarterly to present flight performance analysis of the Landsat-2 spacecraft Previously issued documents are
Document No Title Date
75SDS4214 Landsat-2 Launch and Flight Activation 21 March 1975 Evaluation Report 22 to 26 January 1975 Launch through Orbit 50 and Orbit Adjust Operation
75SDS4228 Landsat-1 and Landsat-2 Flight Evaluation 15 August 1975 Report 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and Landsat-2 Flight Evaluation 10 October 1975 Report 23 April 1975 to 23 July 1975
75SDS4266 Landsat-1 and Landsat-2 Flight Evaluation 1 December 1975 Report 23 July 1975 to 23 October 1975
Tins report contains analysis of performance for Orbits 3815 to 5100 for Landsat-2
LS-2 vilvili
SECTION 1
SU MIARY
LANDSAT- 2 OPERATIONS
SECTION I
SUMMARY LANDSAT-2 OPERATIONS
The Landsat-2 spacecraft was launched from the Western Test Range on January 22 1975 at 0221755 51 604 The launch and orbital injection phase of the space flight were nominal and deployment of the spacecraft followed predictions All systems continue normal except Forward Scanner Pressure Forward Scanner Pressure Telemetry and Wideband Video Tape Recorder No 1 (WBVTR-1) The Forward Scanner Pressure had begun leaking before launch but will not affect scanner performance The Forward Scanner Pressure (Function 1003) telemetry became erratic in Orbit 2244
WBVTR-1 failed to rewind in Orbit 1021 and had intermittent operation to Orbit 1659 when normal operation was resumed WBVTR-1 had a new anomaly in Orbit 2863 on August 3 1975 when ground stations were unable to obtain video sync lockup because of failure of one head to produce video and WBVTR-1 operations were then discontinued Tests were made thru Orbit 4893 on 8 January 1976 after which all use of the recorder stopped Spacecraft performance has not been degraded by these anomalies Table 1-1 shows cumulative in-orbit payload system performance
LS-2 i-1
Table 1-1 In-Orbit Payload Systems Performance (12176) Landsat-2
Launch Thru Orbit 5070
RBV Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles Real Time Images 6Recorded Images
ii)
729 66
64 78
5 98 2
MSS Total Scenes Imaged Avg ScenesDay Total Area Imaged (millions of sq ON TIME (hr) ONOFF Cycles 6Real Time Images oRecorded Images
n mi)
63706 179
5555 7026
5351 60 40
DCS Messages at OCC Non-Perfect MSGS Max DCPs ACTIVEDAY Users Avg MSGACTIVE Orbit ON TIME (hr)
398082 29073
110 46
158 8632
WPA-1 6Real Time Mode 6Playback Mode ON TIME (hr) ONOFF Cycles
1 99
862 554
WPA-2 6Real Time Mode 6PB Mode ON TIME (hr) ONOFF Cycles
60 40
5521 3441
WBVTR-i Record Mode o Playback Mode 6Rewind Mode Standby Mode Mirror Frame Sync Error Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 1056 1693 1336
VWBVTR-2 6Record Mode Playback Mode 6Rewind Mode 6Standby Mode MFSE Count in PB Time Head-Tape Contact (hr) Cycles Head-Tape Contact ON TIME (hr)
38 41 20 1
lt 10 3467 4641 4390
1-2 LS-2
SECTION 2
ORBITAL PARAMETERS
LANDSAT-2
SECTION 2
ORBITAL PARAMETERS
Landsat-2 together with Landsat-1 has continued to provide the ground track repeat pattern reqmred for the nine-day image coverage of the earth During this report period the ground track of Landsat-2 has been maintained as required within 10 NM longitude error at the equator This has been done by controlling the ACS pitch gates through the use of pitch position bias mode (See Section 4 also ) Thereshyfore no orbit maintenance burn of the OAS was required during the current report period
The error in longitude since launch as a function of time and orbit maintenance burns is shown in Figure 2-1 Figure 2-2 shows the change in sun time at the descending equatorial crossings
As of 23 January 1976 Landsat-2 has descending equatorial crossings at approximately 928 AM local time as opposed to 907 AM for Landsat-1 A projection of the variation of local mean time at the deshyscending nodes for both spacecrafts is given in Figure 2-3
The Brouwer Mean Orbital Parameters for Landsat-2 are given m Table 2-1 Appendix B gives ground trace repeat cycle predictions
Table 2-1 Landsat-2 Brouwer Mean Orbital Parameters
Element sampni-Mair Two Body Nodal Argiment Right Alae Apogee Perigee Inclination Axs Period Period of Perigee Ascension Anomaly
Date (1) (101) (Dog (11) Eccentricrty (Atin) (pin) (D)g) (Deg) (Dog)
25 Jan 19751 915 03 901 56 99 095 7286 462 0 000925 103 165 272 852 56 637 139 578
26 Feb 1975 916 84 898 47 99 096 7285 820 0 001260 103 151 256 040 99 347 134 523
24 Apr 1975 917 85 897 40 99 079 7285 788 0001403 103 161 103 266 62 55 174 339 117 183
25 July 1975 917 45 897 68 99 071 7285 733 0 001356 103 150 103 265 166 118 264 891 13 726
23 Ott 1975 916 70 898 49 99 059 7285 762 0 001250 103 150 103 266 282 749 353 365 257 271
24 Jan 1976 917 36 897 81 99 046 7285 754 0 001342 13 150 103 266 31 621 84 584 148 179
1 Post launch
2 After the sequence of phasing maneuvers completed In Orbit 212
LS-2 2-1
12
I1 ORBIT ADJUST NO 1010 +8 99
9 ORBIT ADJUST START ACS+2 0
TCH 8 NO 9 BIAS MODE OPERATION
7 - ORBIT ADJUST A 5 No8
4
2d 2 (Elt
z A z - - D - to (9owcsI-blt
-EAST z0 WESI
STOP ACS PITCH BIAS
0 -3 OPERATION
Z -2
E -4 -3 24
-5_ -6 CURRENT -7 REPORT PERIOD
-8 RBIT ADJUSTS I THRU 7 (25 JAN-12 FEB 75) TO ACHIEVE NOMINAL PARAMETERS AND PROPER PHASING WITH LANDSAT-1
-10C
-II
-12 o i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
I 0
I 311
I
813 I
1315
1
I
1817
REPEAT CYCLES
I IIII 2319 2821 3
323 3825 4327 4
I 829
5
I 331
REVOLUTIONS
Figure 2-1 Effect of Orbit Adjusts on Landsat-2 Ground Track
0932
0931
0930
0929 01-22-76 09 28 31
0928
0 0927
0926
Z 0925
094 J
CURRENT
lt REPORT PERIODO 0923
0922
0921
0920
0919 I FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB 75 76
TIME
Figure 2-2 Local Mean Tame of Descending Node
2-2 LS-2
S MUAMW -------------77- _- _ - -UT _MEamp A
- - ------
=
7- -7shy
_ r_ - x x _ i
I-I
_J---- --4_ - +
-a __
- - I - [ I a Di d F R M d B N DJ d5 dU R Np I F IMH M J it S a ND
Figure 2-3 Predicted Limit of Descending Node
LS2L OF Tii 2-34 pJaIMAL PACE IS 1Pnnii
SECTION S
POWER SUBSYSTEM (PWR)
LANDSAT-2
SECTION 3
POWER SUBSYSTEM (PWR)
The Power Subsystem on Landsat-2 has performed well throughout this report period The solar arrays have continued to provide excess energy above spacecraft and payload requirements and are expected to fully support the Landsat-2 mission beyond 1976 The batteries and the subsystem electronics have also shown very good performance during this report period
The percentage degradation of the arrays is plotted as a function of days in orbit in Figure 3-1 along with the pre-launch predicted array degradation The array degradation during this report period has been slightly higher than predicted The projected values of midday array current are plotted in Figure 3-2 Here the array current is adjusted for sun intensity and array degradation as well as sun angle Along with the same curve is plotted the actual telemetry values observed until the end of the current report period
During Orbit 3971 (3 November 1975) Landsat-2 passed through the partial solar eclipse over the Southern Hemisphere Real tume adjustments to the auxiliary loads were made to compensate for the loss in array energy
The battery packs averaged a typical 90-i00depth of discharge (DOD) during this report period but has peaked as high as about 16 during nghts with long WBR playbacks Compensation loads have been reduced to mininmze the peaks in DOD leaving only loads 3 4 and 8 on at the end of the current report period (See Table 11-2 for a history of compensation load switchings since launch) Battery temperature spread ranged from 50 to 8 5oC and is expected to be in the lower range during the on-coming period of lower sun inshytensity Charge and load sharing of individual batteries have been satisfactory Battery voltages have been maintained within suitable limits with Landsat-2 power management procedures excess array energy being dissipated through auxiliary loads
The power subsystem electronics have performed extremely well during tls report period with all regulated voltages stable Table 3-1 shows major subsystem parameters and Table 3-2 shows power subsystem teleshymetry for selected orbits Some parameters in Table 3-1 may be slightly different from those in Table 3-2 because Table 3-1 uses a power management time span (night followed by day) whereas the time span used in Table 3-2 is the playback period from the NBR
The shunt limiter on Landsat-2 has operated several times since launch and has held the solar array bus voltage at specified levels
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2 Figure 3-4 is a prediction of the variations of the sun angle through 1977 for Landsat-1 and 2
LS-2 3-1
--- -
LANDSAT-2 ACTUAL SOLAR ARRAY
-6 DEGRADATION 1A (MIDDAY)
-8 (1 AU NORMAL SUN) (150 AMP BASE)
_ -10
(9 -14 a
-16
-18
-20
-22
-24
f 10
LANDSAT-2
PRE-LAUNCH PREDICTED SOLAR ARRAY DEGRADATION- (MIDDAY)
-- 328 X 10 DENICM 2 AY
-105 12 MONTHS
100 1000 10000
LANDSAT-2 DAYS FROM LAUNCH
Figure 3-1 Landsat-2 IA (Midday) Degradation vs Days
LANDSAT-2
HIGH NOON SOLAR ARRAY CURRENT
PREDICTED CURRENT ADJUSTED FOR SUN INTENSITY
SUN ANGLE AND RADIATION 15 ACTUAL DEGRADATION
14
Z Ld
13 FULL MISSION PREDICTED
zCD 12 - (PEAK LEVEL)
MSS + IWBR + 20W WBDLK (250 FME) __ RBV + Z0W WBDLK (450 FME)
-E L(PEAK LEVEL) (AVERAGE LEVEL)
MSS + 20W WBDLK (450 FME)
0(I)
(AVERAGE LEVELF
Z8 9
z a CURRENT
REPORT
0i PERIOD
oIII I I II
100 200 300 400 500 600 700 800
DAYS IN ORBIT
Figure 3-2 Landsat-2 Midday Solar Array Current
Table 3-1 Landsat-2 Major Power Subsystem Parameters
Pvr Mgmt Orbit No 50 1251 2540 3820 4250 4669 5100
Batt I Max 3343 3308 3325 3360 3291 3291 3266 2 Clge 3340 3305 3314 3348 3289 3289 3263 3 Volt 3335 3300 3309 3343 3283 3292 3257 4 3345 3302 3320 3354 3285 3294 3268 5 3342 3308 3325 3359 3291 3291 3265 6 3341 3307 3324 3350 3290 3290 3264 7 2345 3311 3328 3354 3293 3293 3268 8 33 45 3310 3327 3353 3293 3293 3268
Average 33 42 3307 3321 3353 3289 3292 3265 Batt 1 End-of-Night 2932 2898 2906 2889 2906 2880 2906
2 2938 2895 2912 2887 2904 2878 2904 3 2932 2898 2907 2889 2907 2881 2907 4 2934 2900 2909 2891 2909 2883 2909 5 2940 2897 2906 2889 2906 2889 2906 6 2931 2896 2896 2879 2896 2879 2896 7 2934 2900 2908 2891 2908 2882 2908 8 2934 2900 2900 2882 2900 2882 2900
Average 2934 2898 2905 2887 2904 2882 2904 Batt 1 Chge 1276 1236 1213 1257 1276 1321 1243
2 Share 1168 1224 1245 1212 1177 1167 1142 3 () 1224 1321 1367 1362 1296 1308 1248 4 1199 1262 1250 1234 1191 12 10 1176 5 1284 1201 1152 1183 1250 1249 1324 6 1335 1271 1320 1302 1402 1312 1432 7 1290 1286 1281 1283 1290 1301 1297 8 1224 1199 1172 1165 1118 1132 1138
Bait iLoad 1260 1197 1135 1140 1120 1150 1180 2 Share 1270 1412 1399 1351 1375 1344 1334 3() 1267 1314 1438 1381 1443 1364 1374 4 1244 1257 1299 1287 1284 1267 1248 5 1234 1159 1158 1187 1192 1234 1236 6 1270 1210 1130 1191 1133 1184 1156 7 1247 1242 1235 1256 1253 1263 1270 8 1204 1208 1206 1208 1200 1194 1202
Batt ITemp 2146 2020 2134 2202 2178 2182 2194 2 mi 2025 1998 2144 2102 2013 1967 1994 3 (degC) 1860 1822 1918 1872 1779 1762 1786 4 2083 2073 2091 2098 2015 2018 2036 5 2498 2211 2231 2314 2366 2416 2727 6 2426 2178 2301 2370 2428 2420 2728 7 2471 2259 2362 2434 2466 2462 2632 8 2363 2204 2271 2329 2330 2340 2441
Average 2234 2095 2181 2215 2197 2196 2317 SC Beg Ens 1wr (W) 16138 1850 1902 1476 1547 1493 Comp Load Pwr (R) 3406 412 412 194 248 248 PL Reg Bus Pwr (V) 959 96 96 98 126 98 CD Ratio 115 108 110 128 120 124 111 Total Charge (A-M) 2719 25098 26755 29855 24835 25799 22346 Total Discharge (A-M) 2372 22967 24433 23314 20673 20749 20145 Solar Array (A-M) 1106 1032 981 999 1006 1009 1003 SA Peak I (Amp) 1605 1537 1467 1482 1474 1482 1443 Midday Array I (Amp) 1451 1388 1404 1412 1396 1372 Sun Angle (Deg) 008 -122 155 210 484 835 Max R Pad Temp (00) 6080 5960 6440 6440 6560 6320 Mn R Pad Temp (ft) -3867 -3800 -3740 -3680 -3620 -3500 Max L Pad Temp (oc) 5769 5692 600 6215 6431 6215 Mm L Pad Temp (oc) -4571 -4500 -4429 -4357 -4357 -4214
Data not processed and unavailable
EPRODUCIBIL1TY OF THE LS-2 OGWNAL PAGE IS POOR
3-4
Table 3-2 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data Received in NBTR Playback)
Orbits Function Description Umt 50 1253 2532 3810 4251 4670 5102
6001 Batt 1 Disc I Amp 101 089 085 068 087 075 074 6002 2 101 097 097 082 1 04 090 084 6003 3 100 097 099 085 1 06 092 0 87 6004 4 100 093 093 079 097 085 073 6005 5 099 086 085 073 091 084 0 78 6006 6 1 02 090 086 072 087 080 0 73 6007 7 100 091 091 077 094 087 080 6008 8 0 97 089 087 074 091 082 075 6011 Batt 1 CbgI Amp 047 043 057 051 0 51 045 042 6012 2 043 046 057 049 048 040 038 6013 3 045 045 061 054 052 044 042 6014 4 0 44 043 057 0 50 048 041 039 6015 5 047 041 054 048 050 042 044 6016 6 049 044 060 053 055 045 047 6017 7 047 044 060 052 052 044 043 6018 8 045 041 055 048 046 038 038 6021 Batt 1 Volt VDC 3150 3118 3092 3117 3106 3102 3111 6022 2 3148 3115 3090 3116 3104 3100 3109 6023 3 3149 3116 3091 3116 3105 3101 3110 6024 4 3149 3116 3091 3117 3105 3101 3110 6025 5 3150 3118 3092 3118 3105 3102 3111 6026 6 31 49 3116 3090 3115 3103 3101 3108 6027 7 3152 3120 3094 3120 3108 31 05 31 14 6028 8 3149 3117 3092 3117 3106 3103 3111 6031 Batt 1 Temp DCC 2159 2023 2093 2202 2174 2188 2191 6032 2 2053 2005 2075 2093 2014 1974 19 90 6033 3 1880 1830 1866 1884 1780 1765 1777 6034 4 2090 2075 2088 2105 2017 2020 2033 6035 5 2516 2215 22 22 2326 2359 2422 2718 6036 6 2437 21 79 22 55 23 86 2424 2426 2719 6037 7 2483 2262 2326 2436 2467 2467 2619 6038 8 2375 2205 2252 2337 2331 2347 2436 6040 Rt Pad Temp DGC 2896 2672 2616 2931 2943 3050 3090 6041 Pt PadVM VDC 3372 3374 3356 3351 3348 3323 3286 6042 Rt PadVN VDC 3346 3300 3318 3325 3298 3262 3244 6044 Lt Pad Temp DGC 2556 2186 2116 2471 2488 2638 2822 6045 Lt PadVF VDC 34 40 3399 3380 3395 3394 3387 3382 6046 Lt PadVG VDC 3448 3409 3391 3404 3403 3394 3391 6050 6051
SC UR Bus V SC RG Bus V
VDC VDC
3173 2457
3141 2458
3114 2457
3135 2457
3130 2457
3126 2458
3133 2458
6052 Aux Reg AV VDC 2336 2339 2340 2342 2344 2344 23 44 6053 Amx Reg EV VDC 2337 2340 2339 2339 2341 2344 23 44 6054 Solar I Amp 1481 1424 1376 1385 1386 1374 1340 6056 SC RGBus I Amp 723 662 717 737 625 624 628 6068 PC ModT1 DGC 2167 2142 2198 2216 2028 2018 2077 6059 PC ModT2 DGC 2044 2006 2053 2068 1951 1943 19 56 6070 PL PG Bus V VDC 2461 2460 2460 2460 2460 2460 2460 6071 PL UR Bus V VDC 3185 3149 3121 3144 3137 3132 3140 6073 P Aux AV VDC 2347 2350 2351 2349 2351 2351 23 51 6074 PAuxBV VDC 2346 2350 2351 2350 2351 2351 2351 6075 PR Mod T1 DGC 2084 2069 2139 2144 2057 2014 2032 6076 PP Mod T2 DGC 2213 2201 2238 2254 2191 2164 2179 6079 Fuse Blow V VBC 2448 24 47 2448 2450 2449 2447 2449 6080 Shunt 1 I Amp 0 0 00 00 00 000 000 000 6081 2 00 00 00 00 0009 000 000 6082 3 00 00 00 00 000 000 000 6083 4 00 00 00 00 000 000 000 6084 5 00 00 00 00 000 000 000 6085 6 00 00 00 00 000 000 000 6086 7 00 00 00 00 000 000 000 6087 8 00 00 00 00 000 000 000 6100 Total NO
PI PG Bus I Major Frames
A Frh
038 396
042 785
080 387
0 0 384
066 784
048 785
054 785
LS-2 3-5
9 42 -0o
w
8
7
41
40
I
1 t
6
5 (o
L939
38 -II 0
I
tI 0 4
Id3 z n- 2
1
m 0 37 a
36
lt35
_34
-
-C
I 2 0
f
1-0ltC 0 330I0 1
I
z J1
S-2 31 1
3
--- 4
-5
-29
-28
30
o -REPORT
CURRENT
lPERIOD
-6 - 27
-7 2 I
100 200 300 400 Soo 600
DAYS IN ORBIT 700 800 900 1000
Figure 3-3 Landsat-2 Actual p and y (Paddle) Sun Angles
VOLDOIYL FRAMAIE 2
JANUARY rERUArY MAR00 APRIL NAY JUNE JULY AUGUST SEPTEMBER OCTOBER NVEEMBER
s RSI 92 5 9119f0 51012 R 1192025 10 1 0 2s 501920221 210022 1 910152025101202 U 2122
EE-E 4 1
6a
1414l
JANUARY FEBRUyAY 0A-0 APRIL VAT JUNE JUI- AUGUST 5CI0B22 OCTOSER NOVEMBER
Figte 3-4 Predicted Beta Angles for Landsat-1 and Landsat-2 - 1976 and 1977
LS-2 3-78
SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)
LANDSAT-2
SECTION 4
ATTITUDE CONTROL SYSTEM (ACS)
Landsat-2s Attitude Control System has been operating properly since launch and has consistently maintained correct spacecraft attitude
The pressure leak in the Forward Scanner has had no effect on the ACS Systems performance
In mid September (Orbit 3288 15 September 1975) a program was implemented to control spacecraft ground track drift by limiting the number of pitch gates occurring in each orbit and by assigning them polarity The ACS system is commanded into the +20 Pitch Position Bias mode during satellite mght for specific durations centered about satellite midnight In addition the program is implemented in either alternate or successive orbits depending upon the number of properly polarized pitch gates required to affect the spacecrafts ground track drift andor drift rate
Table 4-1 summarizes the sequences maintained to date and Figure 2-1 in Section 2 shows the effects of these sequences on the spacecrafts orbit
Table 4-1 Landsat- 2 +20 Pitch Position Bias Summary
Duration Centered Resulting Average About Satellite Number of
Midnght Pitch Gates Time Span Implementation (Minutes) Per Day
15 Sept to 18 Sept Alternate Orbits 25 5 + pitch
18 Sept to 12 Oct Consecutive Orbits 50 2 - pitch
12 Oct to 18 Oct Alternate Orbits 25 2 to 4 + pitch
18 Oct to 14 Nov Consecutive Orbits 50 2 to 5 - pitch
14 Nov to 18 Nov Alternate Orbits 25 2 to 3 + pitch
18 Nov to 18 Dec Consecutive Orbits 50 2 to 3 - pitch
18 Dec to 5 Jan Alternate Orbits 25 1 to 2 + pitch
5 Jan to 11 Feb Discontinued -- 10 to 11 + pitch
Secondary benefits have also been derived from this effort The requirements for routine orbit adjusts have been eliminated and freon is being conserved due to the metering effects of controlled pneumatic gating
Freon Useable Impulse declined predictably during this report period as shown in Figures 4-1 and 4-2
RMP 2 commanded into operation shortly after ACS acquisition as the primary control of the yaw subsystem has functioned normally
Both Solar Array Drives (SAD) performed normally and maintained proper solar panel alignment with the sun line during satellite day Motor voltages and temperatures are within specifications
Typically flywheel duty cycles have averaged seven percent or less Pitch and Yaw flywheel speeds have averaged less than -150 RPM while the Roll flywheels have averaged +760 RPM Sun transient response due to dual scanner mode operation has been similar to Landsat-1 and is normal
Tables 4-2 4-3 and 4-4 show typical telemetry for temperatures and pressures voltages and currents and attitude errors and driver duty cycles as obtained from SCEST program averages
LS-2 4-1
16
t F
O
101
01
0
-
-)P
ITC
H
(+) P
ITC
H
--H
RO
LL
(+F) R
OLL
RBV O
N
14
J2
102
H
II ltI
L
I
LJ
L1LJ
-
-JLJshy
-
r
r J i
rt
L I
FIr
-
Lada-
ai]Feunc
sTm
S1975 F1G
7c 17
30 30 ORBIT NO 3288 (15 SEPT 75)
+8o PFBIMPLEMENTED
25
560
x Lii
20
U
~520
540
500 U)
I-o0 440
-W
5z 420
~400 Iz
4 j+ R O L L GATES
LS-2
n5z 5
2ZG
10
4 15
57
-PITCH
20 24
611 716
WEEKS FROM LAUNCH
GATES
30
Vzo 35
924 40
1029 45 50
123 11717 Figure 4-2 Landsat-2 Gating History
4-34
TEppucmnmOTH
r-0
Table 4-2 Landsat-2 Subsystem Temperature and Pressure Averages
Orbits
Function Uits 29 1253 2532 3810 4241 4670 5102
1084 RMP 1 Gyro Temperature 1094 RMp 2 Gyro Temperature 1222 SAD RT MTR HSNG Temp
DGC DGC DGC
19 33(1) 7400 1950
2115 7400 22 24
21 02 7400 2223
2270 74 02 2381
2426 7431 25 16
2383 7434 24 66
2269 7426 2298
1242 SAD LT MTR HSNG Temp DGC 2687 27 94 2754 2936 30 61 30 60 2979 1223 SAD RT MTR WNDNG Temp DGC 2176 2431 2423 2575 2683 26 23 2436 1243 SAD LT MTR WWDNG Temp 1228 SAD RT HSG Pressure
DGC PSI
3023 726
30 85 725
3032 725
32 28 725
3372 720
3374 722
3283 718
1248 SAD LT HSG Pressure PSI 728 728 727 727 7 24 7 24 721 1007 FWD Scanner MTR Temp DGC 2207 2272 2225 2382 2558 25 33 2380 1016 Rear Scanner MTR Temp DGC 2419 2418 2362 2496 2631 2626 2504 1003 FWD Scanner Pressure PSI 959(2) 259 D D D D D 1012 Rear Scanner Pressure PSI 621 619 600 591 582 583 562 1212 Gas Tank Pressure PSI 19480 180029 167212 159960 159078 1559 49 151704 1210 Gas Tank Temperature 1213 Manifold Pressure
DGC PSI
2066 5398
2266 5455
2233 5488
2413 5470
2538 5676
25 33 54 68
2425 5456
1211 Manifold Temperature 1059 CLG Power Supply Card Temp
DGC DGC
1918 3900
20 78 40 00
2050 3952
2245 4111
2388 4246
2373 42 41
2259 4147
1260 TH01 EBP DGC 2429 25 31 2501 2678 2801 2806 2721 1261 TH02 EBP DGC 2029 21 63 2136 2304 2444 2435 2325 1262 TH03 EBP DGC 1829 20 31 2005 2157 2312 22 84 2146
1263 THOl STS DGC 654 -3 03 -622 -261 160 1 76 052 1264 TH02 STS DGC D D D D D D D 1265 TH03 STS DGC 846 079 - 48 496 747 831 867 1266 TH04 STS DGC -278 -913 -9 65 -495 -214 -204 -326 1267 THO8 STS DGC 9 62 1 28 -264 219 641 6 59 557 1224 SAD R FSST DGC 35 00 34 56 36 57 3878 3998 3900 3581 1244 SAD L FSST DGC 5000 4617 4629 4855 4899 4918 4913
(1) RMP-I Left off after initial test in Orbit 1 (2) Prelaunch leak - refer to text D = Defective telenetry point
Table 4-3 Landsat-2 ACS Voltages and Currents
Orbit
Function Units 29 1253 2532 3810 4241 4670 5102
1081 RMP 1 MTR Volts VDC OFF OFF OFF OFF OFF OFF OFF
1082 liMP 1 MTR Current Amps OFF OFF OFF OFF OFF OFF OFF
1080 RMP 1 Supply Volts VDC OFF OFF OFF OFF OFF OFF OFF
1091 RMP 2 MTR Volts VDC 2999 29 97 29 94 29 94 29 94 29 93 29 92
1092 RMP 2 MTR Current Amps 0 10 0 I0 0 1 010 010 0 10 0 10
1090 RMP 2 Supply Volts VDC -23 63 -23 62 -2361 -23 59 -2358 -23 58 -23 59
1220 SAD RT MTR WNDNG Volts VDC -5 47 -471 -451 -4 85 -4 48 -4 49 -4 47
1240 SAD LTMTR VNDNGVolts VDC -5 08 -491 -470 -470 -4 75 -472 -4 72
1227 SAD FIT -15 VDC Cony VDC 15 14 1514 15 15 15 14 15 12 15 12 15 16
1247 SAD LT -15 VDC Cony VDC 1523 15 21 15 22 15 23 16 21 15 20 1521
1056 CLB+6 VDC TMV 235 235 235 2 38 2 37 2 37 2 38
1055 CLB+ 10 VDC TIMV 2 88 290 2 90 292 292 2 92 2 92
1057 CL1l Power Supply Volts TDIV 297 294 294 2 96 2 97 297 2 96
Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles
Orbits Function Units 26 1202 2532 3810 4241 4670 5102
1041 Pitch Fine Error DEG -0 15 -0 14 -0 14 -1 23 -1 24 - 77 - 13
1043 Pitch Flywheel Speed RPM -156 12 -22122 -198 41 66 38 125 87 -101 Si -162 97
1038 PitchMtr Drvr CCW PCT 6 64 8 61 7 35 4 33 4 76 6 58 6 05
1039 Pitch Mtr Drvr CW PCT 2 03 3 64 2 60 6 82 7 39 4 24 1 80 1030 Roll Fne Error DEG -0 13 -0 11 -0 09 - 13 - 15 - 13 - 14
1027 Roll Rear Flywheel SPD 11PM 729 30 731 98 739 75 754 14 781 91 763 10 748 56
1026 Roll Fwd Flywheel SPI) RPM 703 02 710 22 725 23 735 32 732 53 747 87 735 81
1022 Roll Rear Mtr Drvr CCW POT 0 67 0 86 39 31 55 99 63
1025 Roll Rear Mtr Drvr CW PCT 7 54 7 11 5 47 6 21 6 97 7 19 6 34
1023 Roll FwdMtr Drvr CCW PCr 070 0 79 37 52 62 1 32 87
1024 Roll Fwd Mtr Drvr CW PCT 546 4 47 4 74 4 06 6 07 5 14 4 01
1035 Yaw Tach RPM -95 73 -77 38 -41 57 -98 81 -62 65 -75 84 -38 16
1033YawMtr DrvrCW PCT 1 98 2 10 1 77 1 59 1 94 2 35 2 01
1034 Yaw Mtr Drvr CCW PCT 2 10 215 1 72 1 8 2 00 274 1 90
1221 SAD Right Tach DM 000 3 39 3 38 3 37 3 39 3 38 3 38
1241 SAD Left Tach DM 368 3 64 3 63 3 60 3 57 3 56 3 56
4-6 LS-2
SECTION 5
COMMANDC LOCK SUBSYSTEM
LANDSAT-2
SECTION 5
COMMANDCLOCK SUBSYSTEM (CIlD)
The C(vMD Subsystem operated nominally in this report period On January 1 1976 during Orbit 4787 the
spacecraft clock was moved back by approximately 3 seconds
Figure 5-1 shows the history of the SC clock drift since launch Figure 5-2 shows the cumulative drift since
launch (31 seconds in 12 months) As can be seen the clock of Landsat-2 drifts in opposite direction from
the clock of Landsat-1 Figure 5-2 also shows the clock drift rate which is nearly constant at +06 nnllishy
seconds per orbit
Table 5-1 shows typical telemetry values since launch All are nominal
Table 5-1 CommandClock Telemetry Summary Landsat-2
Function Orbit
No Name Mode Units 35 1253 2462 2964 4241 4670 5091
8005 8006 8007
Prl Red Pri
Power Supply Temp Power Supply Temp Osc Temp
-
--
DOC DGC DGC
38 82 36 93 28 70
39 38 28
86 03 70
40 43 38 70 29 35
39 91 38 20 28 70
39 45 38 02 28 34
38950 39 29 28 63
39 43 38 00 28 70
8008 8009 8010
Red Occ Temp Pri Osc Output Rled Ose Output
--
-
DGC TMV Tu
27 82 1 06 1 17
27 93 1 05 L 19
28 68 i 06 1 20
27 85 1 06 1 19
27 i 1
i0 05 is
27 82 1 0 1 20
27 26 i 05 1 18
8011 100 K Pro -Red TMV 3 17 3 16 316 16 3 15 315 3 15
8012 10 KHz PrO - Red TMV 3 08 3 05 3 05 3 05 3 05 3 05 3 05
8013 2 5KHz Pri -Red TMV 3 01 2 95 2 95 2 95 2 95 2 95 2 95
8014 400 Hz Pr - Red TMV 4 17 4 45 4 45 4 45 4 45 4 45 4 45
8015 8016
Pri +4V Power Supply Red 4V Power Supply
Pri Clk ON Red Clk ON
VDC VWC
NA NA
2 2
05 01
2 2
05 01
2 05 201
2 2
05 00
2 2
05 03
2 05 2 00
8017 8018
PrL Reamp
+6V 4-V
Power Supply Power Supply
Pri Clk ON Red Clk ON
VIC VMC
NA NA
2 2
30 31
2 2
30 31
2 31 231
2 2
30 30
2 30 2 33
2 30 2 30
8019 8020
Pri - 6V Power Supply Red - 6V Power Supply
Pri Red
Clk ON Clk ON
VDC VDC
NA NA
5 5
22 23
5 23 5 23
5 23 5 23
5 23 5 23
5 22 5 26
5 23 5 23
8021 8022
Pr - 23V Power Supply Red - 23V Power Supply
Pri Clk ON Red Clk ON
VDC VDC
NA NA
5 70 5 65
5 70 5 65
5 5
70 65
5 5
70 65
5 70 5 65
5 70 0 65
8023 8024 8101
Pr 29V Power Supply Rcd 29V Power SupplyF CIUA- 12V
Pri Clk ON Red lC ON CIU A ON
VDC VDC VDC
NA NA 3 79
5 5 3
29 29 97
5 30 5 29 3 97
5 5 3
29 28 97
5 29 5 29 3 97
5 29 5 30 3 97
8 29 5 29 3 97
8102 CIU B- 12V CH B ON VDC 3 76 3 95 3 95 3 95 3 95 3 97 3 95
8103 8104
CIUA-SV CiU B shy 5V
CIUAON CIUB ON
VDC VDC
3 93 3 90
4 4
15 10
4 15 4 10
414 4 10
4 15 4 i0
4 4
14 12
4 15 4 10
8105 8106 8201 8202 8203 8204 8205
CIU A Temp CiU B Temp Receiver RF-A Temp Receiver RF-B Temp D MOD A Temp D MOD B Temp Receiver A ACC
CIU A ON CIU B ON
-
-
-
-Receiver A ON
DGG DGC DGC DGC DGC DGC DGC
26 01 23 35
NA 29 09 28 95 37 73
F
22 09 10 96 29 58
F 38 80 27 10
-91 00
22 50 20 08 30 02
F 39 20 27 56
-92 18
21 4 19 90 29 50
F 38 72 2703
-91 74
21 34 19 45 28 89
F 38 37 26 49
-91 32
21 60 20 33 29 03
F 38 44 26 4
-90 83
21 67 19 70 29 14
F 3655 26 72
-91 43
8206 Receiver B AGO Receiver B ON DBM1 -87 83 F F F F F F
8207 Amp A Output Receiver A ON TMV F 2 70 2 51 2 52 2 49 2 77 2 54
8208 8209 8210 8211 8212 8215
Amp B Output Fre Shift Key A Out Freq Suit Key B Out Amp A Output Amp B Output D MOD A - 15V
Receiver B ON Receiver A ON Receiver B ON Receiver A ON leceiver B ON Receiver A ON
THW TMV TMV THV TMV THV
2 10 F
1 11 F
1 13 F
F 1 09 F
1 13 F
4 87
1 08 F
1 12 F
4 87
F 1 08
F 1 12
F 4 87
F 1 08
F 1 13
F 4 87
F 1 09
F 1 14 F
4 87
F 1 08 F
1 13 F
4 87
8216 D MOD B shy 15V Receiver B ON TMV 4 77 F F F r F F
8217 8218 8311
Regulator A - 10V Regulator B - 10V ECAM Mere Imp
Receiver A ON Receiver B ON
ECAM ON
THV TMV DGC
F 5 32 NA
5 40 F
17 95
5 40 F
18 03
5 40 F
17 89
5 40 F
18 66
5 40 F
18 66
5 40 F
18 44
8312 ECAM Pwr Spply Temp ECAM ON DGC NA 22 43 23 13 22 34 23 32 23 31 23 13
NA - Not available due to processing problem - MT 710 F - OFF
LS-2 5-1
+ 3000 +2844
+2500 I
Z + 2000
Id +1500 -
(n0+1000 -z o U)+ 500 -shy
SGM+144
wd p-- 500
-153
j -1000 u U V) -1500
-782
CURRENT REPORT PERIOD
-2000
-2500
0
I I
1
I 2
I I I 3 4 5
ORBITS (X 103)
I 6
I 7
I 8
Figure 5-1 Landsat-2 Drift History
12
(n a Z 0o
10
8 I-
Zr aw
-
2o
6
4
2 -+06
gt ABSOLUTE
FT
+10
+08 Ishy
0
wC
U 0 1
(n1S UUCURRENT
YA
I1ST YEARI I I
D RIFT RATE
REPORT PERIOD
I I l 1I I_
+04
+0O
0
n
Y 0
-1
U)
0 1 2 3 4 5 6 7 8 9 10
Figure 5-2
ORBITS (XIO3 )
Cumulative Drift Since Launch
LS-2 5-2
SECTION 6
TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 6
TELEMETRY SUBSYSTEM (TLM)
The TLM has operated nominally m this report period
Table 6-1 shows typical telemetry values since launch All are nominal except for functions 1264 (Thermal Shield 5 Temperature) 4002 (MMCA Board 2 Temperature) and 13200 (APU 24 Volt Input) which were deshyfective before launch Verification of these functions is acceptable by adjacent temperature and downstream voltage measurements respectively
The Memory section of the telemetry matrix remains in the 0 0 mode
Table 6-1 Landsat-2 TI4P Telemetry Values
Func Orbit No Function Name Umt 35 1253 2467 3810 4261 4670 5091
9001 Memory Sequencer A Converter VDC 445 445 445 445 445 445 445
9002 Memory Sequencer B Converter VDC
9003 Memory Sequencer Temp degC 2000 1919 2077 2065 20 96 2113 2137
9004 Formatter A Converter VDC 452 451 451 452 4 52 4 52 4 52
9005 Formater B Converter VDC
9006 Dig Mux A Converter VDC 422 422 422 422 422 422 422
9007 Dig Mux B Converter VDC
9008 FormatterDig Mux Temp 0C 2500 2323 2398 2475 2493 2680 2780
9009 Analog Mux A Converter VDC 402 405 405 405 405 405 405
9010 Analog Mux B Converter VDC
9011 AD Converter A Voltage VDC 402 402 402 403 403 405 403
9012 AD Converter B Voltage VDC
9013 Analog Mux AD Cony Temp OC 2500 2500 2491 2541 2610 2742 2738
9014 Preregulator A Voltage VDC 400 400 400 400 400 400 400
9015 Preregulator B Voltage VDC
9016 Reprogramner Temp OC 2250 2224 2227 2234 2249 2250 2474
9017 Memory A Converter VDC 445 445 445 445 445 445 445
9018 Memory A Temp degC 1750 1646 1733 1726 1710 1686 1717
9019 Memory B Converter VDC
9020 Memory B Temp 0C 1750 1678 1728 1727 1741 1750 1741
9100 Reflected Power (Xmtr A) dBm 1829 1384 1368 1385 1391 1399 1418
9101 Xmtr A-20 VDC VDC 380 397 398 397 397 397 397
9103 Xmtr A Temp 0C 2773 2102 2097 2179 2192 2321 2640
9104 Xmtr B Temp 00 2327 2207 2287 2302 2443 2774
9105 Xmtr A Power Output dBm 2773 2614 2619 2619 2619 2619 2629
9106 Xmtr B Power Output dBm
Not available due software Not turned on since Prelaunch
LS-2 6-12
SECTION 7
ORBIT ADJUST SUBSYSTEM
LANDSAT-2
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem on Landsat-2 has been fired ten times since launch 6 times using the -X thruster and 4 times using the +X thruster One firing of the -X and +X thruster each was for alignment tests Three +X firings and two -X firings were made to phase the satellite with Landsat-1 to obtain a combined nine day ground track repeat pattern Three -X firings were for orbit maintenance
No firing of the OAS was made during this report period (See Section 2 also)
The Subsystem activity since launch is summarized in Table 7-i A total of 687 lbs of hydrazine has been expended so far from the pre-launch load of 67 lbs
The OAS telemetry has consistently shown normal pressure temperature parameters A sampling of the same is given in Table 7-2 The variations in the thrust chamber temperatures in Table 7-2 are consistent with the variations in sun intensity and sun angle
LS-2 7-1
Table 7-1 Landsat-2 Orbit Adjust Summary
Orbit
Orbit Adjust
No ]kntion Epoch
Baurn Duration -
(Seconds) +Aa
(Meters)
Engine Performance Efficiency
Fuel 1
Used (Lbs)
Tank Pressure
(PSIA)
Tank Temperature
CF) Thruster
Axis
32 1 25 Jan 75
0034008 48 39 1043 002 53996 720 -X
71 2 27 Jan 75 1957008
48 -36 901 002 54746 735 +X
79 3 28 Jan 75 0949008
4200 3455 1070 162 54746 735 -X
86 4 28 Jan 75
21 13 008
4200 3233 1070 151 50246 735 -X
163 5 3 Feb 75 1036008
4200 -2974 970 142 46875 750 +X
191 6 5 Feb 75 10 51 008
3600 -2421 975 115 43871 750 +X
212 7 6 Feb 75 22 31008
3088 -2009 986 095 41621 750 +X
880 8 26 Mar 75 2144008
128 82 1076 004 3974 705 -X
1632 9 19 May 75 1854008
240 +154 1076 007 40121 735 -X
2958 10 22 Aug 75 22 11 588
220 146 1103 007 40496 735 -X
1 Initial Fuel Capacity - 67 lbs
Table 7-2 Landsat-2 OAS Telemetry Values
Function No Name Units 50 1253 2532
Orbit
3910 4241 4670 5102
2001 Prop Tank Temp 0C 2303 2197 2305 2347 2305 2347 2389
2003 Thrust Chamber No 1 (-X) Temp
0 C 2484 3028 3014 2924 2913 2812 2512
2004 Thrust Chamber No 2 (+X) Temp
0C 3734 3763 3841 3983 4020 3969 3855
2005 Thrust Chamber No 3 (-Y) Temp
degC 4722 3623 3420 3792 3883 4236 4635
2006 Line Pressure psia 54560 39969 40497 41026 41110 41244 41325
Widespread of temperature is due to nozzle locations and satellite daynight transitions relative to data averaged
Typical orbital range is from 19 to 59 DGC
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY
LANDSAT-2
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments in Orbits 293 and 321 as reported earlier These adjustments were made on the pitch magnetic rod of the MMCA
No adjustment to the MMCA dipoles was made during this report period
Orbital averages of MMCA telemetry functions for selected orbits are given in Table 8-1
Table 8-1 Landsat-2 MMCA Telemetry Values
Orbit
Function Name Units 50 1253 2532 3810 4241 4670 5102
4001 Al Board Temp degC 2056 1984 1982 1997 1944 1944 19 47
4002 A2 Board Temp o0
4003 Hall Current TMV 340 340 340 340 340 340 3 40
4004 Yaw Flux Density TMV 305 306 307 307 307 306 307
4005 Pitch Flux Density TMV 315 292 290 290 290 290 290
4006 Roll Flux Density TMV 299 298 298 298 297 297 297
fDefective Telemetry Function (Pre-launch) Post launch telemetry drift
LS-2 8-12
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR
LANDSAT-2
SECTION 9
UNIFIED S-BANDPREMODULATION PROCESSOR (USBPMP)
The USB Subsystem has operated nominally in this report period
Table 9-1 shows telemetry values since launch All are nominal The transmitter has maintained a steady power output of about 14 watts since launch Figure 9-1 shows AGC readings of Goldstone for a constant position in space The scatter of data points reflect variations in the ground station calibration and readout
Table 9-1 Landsat-2 USBPMP Telemetry Values
ORBITS
Function NO Noreo Units TV (20degC) 15 50 1253 2462 2964 3810 4241 4670 5091
11001 USE Revr AGC DMI NA -112 72 -12024 -121 7 -1288 -125 3 -1315 -130 5 -131 5 -124 29 11002 USBXmtr Pwr WTS 1 40 136 1 36 1 38 1 43 1 40 142 1 39 1 37 1 38 11003 USE Revr Error K-z NA -2 15 -487 -4 14 -464 -6 88 -423 -4 15 -4 13 -2 97
11004 USB Xpond Temp DGC 22 93 25 88 29 12 24 38 24 37 25 20 2496 24 85 25 32 27 49
11005 USB Xpond Press PSI 1699 1708 1709 16 04 16 74 16 71 16 61 16 47 16 47 16 49
11007 USBXtr A-15V VDC 2 35 2 36 F F F F F F F F
11005 USBXtr B-15V VIC 2 39 F 2 40 2 40 2 40 2 40 2 42 2 40 2 43 2 42
11009 USB Range -15V VDC 2 07 2 07 2 05 2 05 207 206 2 06 2 05 2 05 2 06
11101 PIPPswrA Volt VDC -15 22 -15 10 F F F P F F F F
11102 PMP Pwr B Volt VDC -15 07 F -14 96 -1498 -1502 -1500 -1501 -15 02 -15 04 -14 99
11103 PMP Temp A DGC NA 37 30 32 37 2864 29 12 2946 29 74 30 11 30 84 34 67
11104 M1PTemp B DGC NA 28 34 3516 30 03 30 57 3131 31 26 31 53 31 99 36 08
F Unit OFF in tis period
RANGE =03068 KM -82 AZ = 307
EL = 570
-86 - 0
U 01
-90 U
-94 0 a o
0 0n
-98m 0 000 0 0 0 o
-102 (9 RANGE = 2152 KM
AZ = 9Q0 -106 EL = 17
-110 M- -
CURRENT REPORT
-114 PERIOD
I I I I I I 1
0 4 8 12 16 20 24 28
CYCLES (OF 251 ORBITS EACH)
Figure 9-1 USB (Luk) AGC Readings at Goldstone with 30 Antenna - Landsat-2
LS-2 9-12
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM
LANDSAT-2
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (FIS) LANDSAT-2
The Auxiliary Processing Unit (APU) consisting of Search Track Data Time Code Data and Back-up Timers operated satisfactorily throughout this report period Telemetry for the APU is shown in Table 10-1
Table 10-1 Landsat-2 APU Telemetry Functions
Function Description
Orbit
Umt 21 1253 2532 3810 4241 4670 5102
13200 APU -245 VDC TMV
13201 APU -12 Volts TMV 242 244 245 245 245 245 245
13202 APU Tamp DGC 2744 26 65 26 60 27 01 26 51 2703 2770
Defective Telemetry (Prelaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS MSS WBVTR No 1 and No 2 RBV and PRM functioned normally During this report period the MSS as well as WBVTR No 2 power circuits have been operated on a regular basis RBV power circuits have been operated during the periodic tests on 10 November 1975 and later for image coverage on 11 and 12 November 1975
The Interface Switching Module performed all switchings normally during this report period
10-12LS-2
SECTION 11
THERMAL SUBSYSTEM
LANDSAT-2
SECTION 11
THERMAL SUBSYSTEM (THM)
The Thermal Control Subsystem on Landsat-2 has provided excellent temperature control of all spacecraft equipments since launch
Table 11-1 gives average subsystem telemetry values for several representative orbits during the first twelve months of operation of Landsat-2 Average temperatures of the sensory ring bays are plotted m Figure 11-1
During this report period the sun intensity increased from 1 012 of the mean value to a peak of 1 034 and then slightly declined to a value of 1 032 This caused a general increase in spacecraft temperatures noticeably along bays 11 through 18 The temperatures axe expected to decrease during the on-coming period of lower sun intensity
During Orbit 4204 compensation loads 1 2 5 and 8 were turned off to assist in power management Howshyever in Orbit 4372 compensation load 8 was turned on again because of decreasing MSS temperatures A history of all switchings of compensation loads is given in Table 11-2
18-2 1i-i
Table 11-1 Landsat-2 Thermal Subsystem Analog Telemetry (Average Value for Frames of Data Received in NBTR Playback)
Funfon Function Orbits
No Description Celt 21 1253 2632 3810 4241 4670 5102
7001 7002 7003 7004 7005 7008 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7030 7033
THM THO1 STE THM TH02 0 THAMTHO3 STI THMTUI0 TCB THATTH4STI T HiTh05 SHO OA-X Thuter THA TH06-STO
IA THOd Sf1 THI THO7 STI THMETH08STO THMTH09 SBI THi TIS SBO THITH STI T15 TH12 SBO TMIT13 STI RBV Be Ctrln THI TH14 STO
BR RIad OutbdB THl TiS SEE THAI TH16 Ti THI TH17 SBI THL THIS 00 TI THO3 Bur THATTHl2Bur
DGC DGC DWC DCC DOC DGC DCC DGC DGC DC DCC DCC DGC DGC DC CDC DGC DGC DCC DCC DOC DC DGC DCC DCC
19 40 17 18 18 73 19 38 17 19 1742 19 66 14 78 19 18 18 08 9 34
21 44 18 58 21 65 23 93 22 21 20 38 24 12 2 72
23 07 23 26 21 77 21 67 15 50 23 05
18 71 17 48 18 38 19 08 17 06 17 13 20 52 14 50 18 82 10 00 20 07 21 75 18 58 21 11 22 28 20 49 20 32 21 34
3 05 20 96 21 92 20 72 21 06 15 48 21 71
19 59 18 05 19 49 19 01 17 92 17 46 20 58 14 77 19 18 18 26 20 22 21 80 18 56 21 13 22 13 20 51 20 33 21 29 3 26
21 13 22 29 21 22 21 49 16 28 21 70
19 90 18 22 19 54 19 34 18 03 17 55 20 61 14 85 19 52 18 42 20 27 21 99 18 80 21 58 22 87 21 20 20 65 22 32
3 37 22 15 23 11 22 11 22 42 16 29 22 41
19 33 17 65 18 38 18 07 16 76 16 79 19 81 13 94 18 34 17 30 1 34 20 55 17 99 20 70 22 47 20 93 19 07 22 41
2 72 21 93 22 79 21 86 22 25 15 48 22 27
19 54 17 48 18 19 18 96 16 45 16 63 19 88 13 93 18 29 17 41 19 49 20 82 18 26 21 27 23 47 21 82 19 50 23 S4 2 73
22 95 23 60 22 47 22 67 15 10 23 11
19 97 17 47 18 50 19 34 16 76 16 68 19 65 13 94 18 41 17 44 19 23 20 93 18 39 21 93 24 68 23 62 19 92 26 43
2 93 25 56 25 46 23 74 23 36 15 14 24 59
7035 7040 7041 7042 7043 7044 7045 7040 7048 709 7050 7051 7052 7053 7054 7060 7061 7002 7063 7004 7065 7007 7068 7069 7070 7071 7072 7073 7074 7075 700 7080 7081 7082 7083 7084
rHM THI Bur THMETHO1 TCB TM TH02 TCB THATTH03 TCB
IM TH4 TCB THELTH05 TCB THM TH07 TCB
OM09 TCB MEHTHUI TCB
THAI T812 TCB IMTHIS TCI
THI TH14 SUB MI T1I TB
THM TH17 WCB TMTHIS8TCB
I Mutter By 1 THI Shuttor By 2 TMAMutter By 3 THM utter By 4 TEampuS uttr By 5 THAI Mutter By 7 THM[shutter By 9 TOS Mutter By 10 THIA Mutter By 11 TOE Shutter By 12 THE Mtte By 13 TH Shutter By 14 THI Metter By 15 T [ Shtter By 16 TMI SlSutter By 17 T stutter By 18 TIMQ1 T Zener V IE2 TZener V MI Q3 T ZenerV ME Q1 S Zener V
THA 2 S Zeer V
DC DGC DGC DCC DC DOC DCC DCC DGC DCC DGC DGC DC DGC DGC DEC DEG DEG DEG DEG DEG DEG DEG DEG DEG DEG DEC DEG DEG DEG DEG VDC VDC VDC VDC VIC
19 53 19 42 17 55 16 85 19 90 16 42 17 76 1 30 23 27 23 04 22 89 25 07 22 22 23 52 20 01 22 54 19 34 22 75 33 89
7 50 17 06 33 75 37 46 52 25 61 38 03 60 59 44 67 79 45 20 57 88 40 49
4 85 4 90 5 05 4 97 4 98
18 73 19 08 17 33 16 83 19 69 16 08 17 90 19 24 22 50 20 62 20 43 22 09 20 83 22 32 19 46 18 26 190 0 19 48 35 12 6 35
19 77 35 25 35 65 17 10 46 16 47 54 40 54 52 64 37 85 49 22 36 30 4 85 4 90 5 03 4 96 4 98
19 32 19 78 18 02 18 23 20 05 16 21 18 22 19 31 22 45 20 62 20 34 22 11 21 59 22 79 20 05 24 43 24 75 31 07 36 32
8 67 22 52 38 22 34 96 10 16 46 20 45 70 40 40 53 78 43 68 52 10 39 32 4 85 4 90 5 04 4 96 4 98
19 77 20 11 18 14 18 29 20 20 16 45 18 23 19 51 22 98 2124 21 17 23 19 22 56 23 71 20 89 27 61 26 64 31 71 36 34 6 40
21 87 37 09 36 62 27 12 50 05 53 45 47 92 62 33 51 34 58 35 44 47 4 86 4 90 5 05 4 97 4 99
19 60 19 43 17 52 16 62 19 53 15 81 17 30 18 53 22 39 21 10 21 09 23 28 22 23 23 48 20 59 21 62 20 45 14 51 32 37
3 40 3066
34 48 32 85 16 42 49 56 52 95 4871 63 0 48 38 57 24 42 97
4 85 4 90 5 03 4 95 4 98
19 95 19 40 17 32 15 93 19 24 15 61 17 38 18 73 23 02 22 08 22 25 24 26 22 00 23 91 20 80 22 12 21 26 7 78
32 88 2 90
14 32 34 13 38 15 16 77 55 70 61 02 54 93 69 04 51 04 60 80 44 57 4 85 4 90 5 04 4 95 4 98
20 39 19 72 17 39 16 32 19 33 15 75 17 33 18 81 23 74 23 94 24 67 27 69 24 29 24 86 20 99 26 65 21 13 11 99 33 00
2 90 14 11 34 12 37 09 17 39 67 46 74 14 72 14 82 12 61 13 67 62 45 4
4 85 4 90 5 05 4 96 4 99
7085 7090
THM Q3 S Zeeer V lM PM11out
VDC DCC
5 15 21 02
515 20 76
5 15 21 05
5 15 21 36
5 15 20 16
5 15 20 80
5 15 21 71
7091 7092
THAI Id Attitude MMRBV IRdiator
DC DC
17 79 18 01
17 73 18 07
17 86 180
18 21 18 54
16 91 14 80
17 16 15 65
17 24 16 24
7093 THE IRVC Ctr Bm DCC 20 74 20 82 20 82 21 82 18 12 18 76 19 31
7094 7095
THU WBVTR Root THMWIBVTRBeICt
DCC DCC
13 77 3 64
14 24 4 52
14 71 4 99
15 00 5 19
13 99 4 30
14 96 5 27
15 72 5 55
7096 7097 7098 7099 7160 7101
THE[WVTR Strap HE WB Mt BAy
TilE WDbat By 1 THIVVTR Sep 3 TEM WBVT Sep 17
OIMWBVTRI Cent
DCC DCC DG DC DWC DC
15 90 22 91 22 07 18 03 21 83 22 45
16 24 16 90 10 61 17 81 20 87 22 20
16 95 22 60 19 25 18 76 22 55 25 13
17 12 21 19 18 34 18 82 22 14 23 23
16 20 21 01 18 15 17 82 21 78 22 59
16 94 21 87 19 23 17 73 22 35 23 03
17 63 22 49 20 14 18 12 23 51 23 78
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7130 7131
TH WBVTR 2 B T IIWVTR2 By 15 I8 IMWDVTR2 Ctr
HAI NBTR B Sep 6 HMBTR B Sep 1 MHEINBTRBmCtr
THA 5 f5o t 14 THM OA - Y Thrster THAI MSS WBVTI Bm THA OA +X hruster Til A Pl T
MA P2 T
DOC DC DCC DCC DGC DCC DCC DCC DCC DCC DGC DGC
17 34 21 77 20 74 17 82 22 11 20 32 20 59 25 64 16 75 20 33 34 18
2 90
17 27 20 72 20 65 17 73 20 64 20 30 19 33 22 25 17 15 17 55 31 02
0 84
17 69 20 99 21 08 17 96 20 70 2044 19 40 21 99 17 54 19 72 6 21 2 22
17 09 21 57 21 17 18 36 21 33 20 74 20 28 23 39 17 84 19 39 9 49
23 00
16 92 21 13 20 25 17 17 20 82 19 49 19 57 23 44 16 52 19 22 34 58 444
17 04 22 04 21 16 17 67 21 82 20 18 20 75 24 79 17 51 19 86 30 07
6 46
17 29 23 87 22 34 17 86 23 85 21 21 22 86 27 51 18 21 20 43 29 67 6 97
11-2 REPRODUCIBILITY OF THE LS-2
ORIONAL PAGE IS POOR
AXIS
SU VECTOR
((+) y
BA
1AY
16
SAY 17
18 BAY 1 0
I BAY 2
A
SAY I3
BA 1
BAYBA13B0
50 A
BAYS12SEAY27
RING~BAA
SU LANDSAT-SR
SCEST PROGRAM ORBIT 5102
8VRG
Figure ii-i
()X AXIS
Landsat-2 Sensory Ring Thermal P~rofile
LS-2 11-3
Table 11-2 Landsat-2 Compensation Load History
Compensation Load Status
Orbits 1 2 S 4 5 6 7 8
Launch 0 0 0 0 0 0 0 0
2 X X X X X 0 X X
237 X X X X X 0 0 0
272 X X X X X 0 X X
306 x X 0 X x 0 0 0
572 X X 0 X X 0 0 X
1367 x x X x X 0 0 X
1645 x X 0 X X 0 0 X
1657 X X x X x 0 0 x
4202 0 0 X X 0 0 0 0
4372 0 0 X IX 0 0 0 X
Note
X= ON 0 = OFF
11-4 LS-2
SECTION 12
NARROWBAND TAPE RECORDERS LANDSAT-2
SECTION 12
NARROWBAND TAPE RECORDERS (NBR)
The Narrowband Recorder Subsystem operated satisfactorily throughout the entire period both Recorders alternating in Record and Playback modes with a nominal one minute overlap
Since launch each Recorder has operated for a period of 4591 hours
Table 12-1 identifies cumulative operating hours for both Recorders by mode and Table 12-2 gives typical telemetry values
Table 12-1 NBR Operating Hours by Modes
NBR On Off Playback Record
A 4591 4169 183 4408
B 4591 4169 183 4408
Table 12-2 Narrowband Tape Recorder Telemetry Values Landsat-2
Function
No Name
10001 A - Motor Cur (ma) Record
PB
10101 B - Motor Cur (ma) Record PB
10002 A - Pwr Sup Cur (ma) Record PB
10102 B - Pwr Sup Cur (ma) Record
PB
10003 A - Bec Temp (DGC)
10103 B - Rec Temp (DGC)
10004 A - Supply (VDC)
10104 B - Supply(VDC)
Typical Telemetry Values - Orbits
3637 437719 21112112 38013802 49804981
1320 1405 1333 1302 1802 1080 1078 952 952 937
1485 14633 1417 1402 135 7 1436 14171 1387 1357 1357
1705 1724 1675 1658 1625 4100 4092 3993 4059 3993
2600 2598 2613 2614 2645 4810 4797 4797 4797 4892
261 250 261 248 242
270 254 270 266 262
-2487 -2510 -251 -251 -25 1
-2455 -2468 -246 -246 -246
U8-2 12-12
SECTION 13
WDEBAND TELEMETRY SUBSYSTEM
LANDSAT-2
SECTION 13
WIDEBAND TELEMETRY SUBSYSTEM (WBTS) LANDSAT-2
The WBTS has operated nominally in this report period
Table 13-1 shows typical telemetry values All are nominal
Figure 13-1 is the AGO history recorded at Goldstone with the spacecraft successively at the same points in space The scatter of data points reflect variations in the ground station calibration and readout WBPA-2 has been used more consistently and is presented in this Figure Values from WBPA-1 are nearly identical when this power amplifier is used
Table 13-1 Wideband Telemetry Subsystem
(1) Name TV (2)
1W 20W 424 1479 2462 Orbits
3810 4241 4672 5091
12001 12101
Temp TWT CoU (DGC) 30 1 27 0
33 6 31 2
OFF 31 42
35 63 35 71
35 00 37 14
20 74 30 00
19 30 16 92
19 31 18 14
19 45 18 17
12002 Cur Helix (MA) 330 3 85 OFF 4 30 4 51 OFF F F F 12102 4 03 4 56 453 4 43 4 48 4 52 4 61 4 57 4 59 12003 Cur TWT Cath (MA) 33 20 46 10 OFF 43 60 45 12 OFF F F F 12103 34 09 46 78 45 37 45 26 45 24 44 39 46 00 46 00 46 00 12004 Fvd Power (DBM) (3) 40 61 42 68 OFF 42 60 42 77 OFF F F F 12104 40 93 43 71 43 65 43 66 43 69 43 56 43 60 43 63 43 61 12005 Refil Power (DBM) (3) 22 34 27 0 OFF 25 61 26 10 OFF F F F 12105 34 55 36 45 36 36 37 15 37 14 3691 37 27 37 12 37 08 12227 Con Volt Loop Stress (M2Hz) (4) 1 54 OFF 1 42 1 12 1 32 1 86 1 64 -i4 00 12228 2 53 0 32 0 24 -0 01 -0 05 0 05 -0 39 -0 22 12229 Temp Wld (DGC) 19 5 17 16 19 93 20 88 19 22 16 21 16 94 17 97 12232 +15VDCiPwr 2 65 2 65 2 65 2 65 2 65 2 65 2 65 2 65 12234 +15 VDC Pwr Sup (TMV) (5) 4 07 4 08 4 01 3 94 4 10 4 19 4 10 4 04 12236 +5 VDC Pvir Sup (TMV) (5) 3 55 3 50 3 53 3 54 3 47 3 55 3 52 3 51 12238 -5 VDC Pwr Sup (TMV) (5) 4 08 4 07 4 03 4 01 4 09 4 11 4 08 4 07 12240 -24 VDC Unreg Pwr (TTIV) (5) 5 86 5 90 5 80 5 66 5 91 6 05 5 92 5 90 12242 Temp hnv (DCC) 23 7 21 68 23 21 23 79 22 93 22 01 22 21 22 53
NOTES
(1) Function mnnbers for WPA-1=120XX for WPA-2=21X (2) mhermo-Vacumn Test data for comparison (3) Thvr outputs of 10 or 20 watts can be selected (4) Any reading other than zero or -7 5 is acceptable (5) Only power supply A operated during these orbits
LS-2 13-1
-70
-74
RANGE= 1023 KM AZ = 1230 EL = 610
-78
-82 x
X X
X
x
XX 4
-86
9m-9
RANGE = 2180 KM
AZ = 2830 EL = 160
U -94-
-98
CURRENT REPORT PERIOD
-102
-106
-110
I I I I I I I I I I I I I I I III I
0 4 8 12 16 20 24 28 32 36 40 44 48 5z 56 60 64 68 72 76 80
CYCLES (OF 251 ORBITS EACH)
Figure 13-1 WPA-2 (Link 3) AGO Readings at Goldstone with 30 Antenna Landsat 2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
LANDSAT-2
SECTION 14
ATTITUDE MEASUREMENT SENSOR (AMS)
The AMS is a passive radiometric balance sensor which operates m the 14-16 micron IR band AMS Telemetry Values are shown in Table 14-1
The AMS was launched in the OFF mode (CMD 774) turned ON during Orbit 6 and has been performing normally since then
Table 14-1 Landsat-2 AMS Temperature Telemetry
Function Units 50 1253 2532 3810 4241 4670 5102
3004 Case - Temp 1 DGC 1900 1905 1902 19 39 1818 1867 18 68
3005 Assembly - EGC 1870 1869 1871 1893 1787 1830 1830 Temp - 2
LS-2 14-12
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS
LANDSAT-2
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
On January 6 7 and 8 1976 tests were performed on WBVTR-1 in an attempt to restore it to normal service These tests performed in Orbits 4865 4878 4879 4892 and 4893 failed to effect any change to the Recorder Thus WBVTR-1 still remains inactive
WBVTR-2 has functioned normally throughout this period except for a dropout from Rewind mode in Orbit 3854 (26 October) similar to a prior anomalous dropout in Orbit 1919 (9 June)
Table 15-1 gives typical telemetry values for WBVTR-1 and WBVTR-2 Tables 15-2 and 15-3 show the telemetry values for Record Playback Rewind and Standby operational modes
Figure 15-1 shows tape usage for WBVTR-2
Table 15-1 WBVTR Telemetry Values
WBVTR-1 Functiojis Telemetry Values In Orbits Number Name 4546 996 2642 3812 4261 4680 4879(ET)
13022 Pressure Trans 16 52 16 51 16 51 16 39 1639 16 39 16 39 13023 Temp Trans 2074 20 05 20 62 19 00 18 77 19 00 20 12 13024 Temp Elec 25 00 18 59 24 57 19 67 2007 20 00 21 68 13032 Limiter Volt 1 48 1 49 1 51 1 41 13034 +5 6 VDC Conv 5 70 548 554 5 67 13201 +2 VDC APU 2 44 245 245 245 2 45 2 45 2 45 13202 Temp APU 29 06 2676 2676 27 03 26 58 27 04 27 29
WVVTR-2 Functions Telemetry Values In Orbits Number Name 4546 966 2642 3812 4261 4680 5071
13122 Pressure Trans 1612 16 12 15 81 15 49 15 46 15 34 15 33 13123 Temp Trans 21 50 18 48 20 00 2099 21 21 22 32 23 08 13124 Temp Elec 23 50 1449 1831 19 48 21 85 22 10 22 72 13132 Linmter Volt 1 30 NA 1 32 1 33 134 1 30 1 28 13134 +56 VDC Conv 5 71 6 32 569 5 74 5 67 5 71 5 85 13201 -12 VDC APU 2 44 2 45 2 45 245 2 45 2 45 245 13202 Temp APU 29 06 2676 2676 27 03 2658 27 04 27 63
(ET) - Engineering Test of WBVTR-l NA - Data not available bull - No data WBVTR-l out of service
SflODUBI=ITY OF TH O PAGE IS POOR
LS-2 15-1
Table 15-2 Function Values by Mode Landsat-2 WBVTR-1 Telemetry
WBVTR-1 Orbit FmctionDescription TV 718 1734 2642 4878(ET)
13029 - Input PB Voltage Record 00 00 0 0 0 0 0 0 Playback 0 33 0 30 032 032 0 30
Rewind 0 0 00 0 0 00 0 0
Standby 00 0 0 0 0 00 00
13028 - Capstan Motor Current Record 032 027 0 36 033 031 Playback 029 030 030 0 31 0 30 Rewind 0 23 0 21 0 27 0 23 028 Standby 00 00 0 0 00 0 0
13030 - Headwheel Motor Current Record 050 051 050 0 50 0 53 Playback 0 495 049 0 49 0 49 053
Revind 041 044 0 44 0 44 047 Standby 041 044 0 43 045 046
13031 - Recorder Input Current Record 358 3 61 3 62 3 69 3 62 Playback 3 92 3 86 3 93 386 3 86 Rewind 2 18 2 16 2 30 2 19 2 23 Standby 1 79 1 90 1 80 1 95 1 95
13033 - Servo Voltage Record 00 00 0 0 0 0 0 0 Playback 49 99 5004 5037 50 08 5037
Rewind 00 0 0 0 0 0 0 0 0
Standby 0 0 00 0 0 0 0 0 0
13026 - Capstan Motor Speed Record 89 77 88 03 88 03 8803 85 13 Playback 89 37 8745 86 29 86 87 8513
Rewmd 100 12 99 06 97 32 98 48 9673
Standby 0 0 0 0 00 00 0 0
13027 - Headwheel Motor Speed Record 975 96 18 95 07 9507 93 96 Playback 9686 9507 9452 9452 9286
Rewind 98 96 97 28 9562 96 73 96 73 Standby 9912 97 28 93 96 95 62 95 07
(ET) - Engineering Test of WBVTR-1
LS-2 15-2
Table 15-3 Function Values by Mode Landsat-2 VTBVTR-2 Telemetry
WBVTR-2 Orbit
FunctionDescription TV 437 1734 2642 4878
13129 - Input PB Voltage Record 00 00 00 00 0 0
Playback Rewind
0 37 0 0
0 36 0 0
034 0 0
033 00
034 0 0
Standby 0 0 00 00 00 0 0
13128 - Capstan Motor Current Record 033 033 032 0 37 038
Playback Rewind
0 34 0 16
035 020
0 35 0 19
034 018
035 015
Standby 00 00 00 00 00
13130 - Headwheel Motor Current Record 0 47 047 0 47 047 048
Playback Rewind Standby
0 46 043 045
046 0 42 042
0 47 0 43 043
047 0 42 0 43
0 48 0 41 041
13131 - Recorder Input Current Record 2 88 2 90 2 90 2 90 290
Playback Rewind
3 11 1 79
302 1 79
3 08 1 80
308 180
311 1 80
Standby 1 18 158 1 60 1 48 1 62
13133 - Servo Voltage
Record 0 0 0 0 00 00 0 0
Playback Rewind
4892 0 0
49 04 00
49 33 0 0
49 52 0 0
49 43 0 0
Standby 0 0 00 00 00 0 0
13126 - Capstan Motor Speed Record 10866 10670 106 02 105 33 105 33
Playback Rewind
108 38 13009
106 70 11768
10602 117 0
10533 116 31
10396 117 68
Stancby 00 00 0 0 00 00
13127 - Headwheel Motor Speed Record 9841 96 52 9600 96 52 95 48
Playback Rewind
9811 99 95
9600 97 04
95 48 96 00
9444 9548
94 44 96 52
Standby 101 72 97 04 96 52 9496 96 00
LS-2 15-3
z0
1000
900
800
U lt 700
U Lii 600IL
6 500 Ishy
lt 400
o 300 Ix 02o
S200
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TAPE FOOTAGE (X 10O)
Figure 15-1 Tape Usage Thru Orbit 5096 WBVTR-2
SECTION 16
RETURN BEAM VIDICON
LANDSAT-2
SECTION 16
RETURN BEAM VIDICON (RBV)
The second periodic test of the RBV Subsystem was performed on 10 November 1975 In Orbit 4068 the downhink filters were configured and all EBV modes were set up RBV operational tests were started in Orbit 4070 and continued through Orbit 4072 MSS imagery was transmitted simultaneously for comparison and evaluation All operations were normal with no discermble effect on other spacecraft subsystems
During Orbits 4082 and 4083 (11 November) and Orbits 4096 and 4097 (12 November) the RV was operated over Brazil for use by that station Again all operations were normal
Table 16-1 gives typical telemetry values for the RBV Subsystem during the test operations Tables 16-2 16-3 and 16-4 give telemetry values for Prepare Hold and Read modes of the three RBV cameras
LS-2 16-1
Table 16-1 RBV Telemetry Values
Function Orbits TV
No Name Value 41 54 151 209 2371 3052 4072
14001 CCC Board Temp (DgC) NA 19939 1965 1972 20 58 20 27 1941 2012 14002 CCC Pwr Sup Temp (DgC) NA 21047 2052 2065 2190 21 46 20 61 2112 14003 15 VDC Sup (TMV) NA 3950 392 375 389 3 92 3 92 395 14004 +6V -525VDC Sup (TMV) NA 3075 292 292 300 3 07 305 305 14100 0198 NA NA NA NA 070 070 070 14200 VID Output V (TMV) 093 NA 105 1 16 130 1 23 F 111 14300) 106 NA 103 110 1 24 1 27 F 125 14102 375-402 3950 385 385 386 3 81 383 374 14202 Comb Align Cur (TMV) 387-4 10 3875 391 391 3 92 3 92 F 378 14302) 380-405 3850 390 372 385 380 F 372 14103) NA 24363 2424 2410 2608 24 49 22 87 2402 14203 14303
Elec Temp (DgC) NANA
20387 25363
1984 2505
1997 2535
2216 2820
22 24
40 15
20 01 2222
2091 2355
14104 NA 23363 2344 2355 25 68 24 13 22 16 2369 14204 LV Pwr Sup T (DgC) NA 18834 18 14 1829 20 61 20 87 18 20 1934 14304) NA 26023 2536 2566 28 28 24 12 22 30 2362 141) 392-407 3950 400 382 395 3 94 398 369
14205 Defi Pwr Sup +10 VDC (TMV) 395-410 3 950 397 380 393 3 92 F 385 14305 395-407 4000 400 400 400 3 95 F 400 14106 14206 L V PS +6V -63 VDC (TMV)
365-380 367-380
3700 3650
367 365
352 349
364 361
3 59 3 61
367 F
340 342
14306) 365-377 3725 370 370 371 3 66 F 370 14107 253 2650 261 249 254 2 54 2 59 239 14207 Ther Elec Cur (TMV) 243 2500 249 237 2 42 2 44 F 231 14307 v C f 252 2575 2 57 246 249 2 52 F 254 1410 180-3 0 2950 243 244 2 49 2 48 2 55 236 1421 Vid Fl Cur (TMV) 25-27 240 240 230 2 37 2 34 F 225 143081 250-280 2575 25 246 2 54 2 54 F 24 14110 295-320 3025 298 298 298 2 95 2 95 290 14210 Vid Tg Volt (TMV) 3 15-3 45 3050 286 286 2 93 2 93 F 281 14310 255-280 3225 263 261 2 23 06 F 251 14113 286 40G50 292 287 2 84 279 2 98 70 14213 Vert DelfV4(T2V) 309 4275 315 312 308 2 99 F 3 18 1431314114 391
21 99 4275
21997 359
1987 3 45
20 18 351
21 18 3 48
20 67 F
19 92 356
2053 14214 Vid FPT (DgC) 2100 21 059 2028 2064 21 56 21 14 20 60 2103 14314 2266 22398 20 65 2085 21 89 21 12 20 37 2096 14115 2417 20940 2104 2147 23 23 22 41 20 98 2195 14215 FOe CoilIT (DgC) 23 82 20387 2067 21 00 22 83 22 22 20 63 2155 14315 2447 21940 2225 2266 2453 23 08 2172 2267
bull14XX refers to Camera 1 14=X refers to Camera 2 143XX refers to Camera 3
NA - Data not Available
CD F - Cameras 2 and 3 off Camera 1 only was operated
Table 16-2 Camera 1 (Blue) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 3052 4072
Hold 066 065 065 067 070 063 068 14101 Focus I Prep 1 71 168 168 174 175 167 173
Read 283 280 285 285 290 285
Prep 079 080 075 075 080 077 079 14109 Grid V Read 243 242 243 242 244 242 241
Hold 400 395 395 395 400 396 399
Hold 038 038 038 038 040 035 037 14111 Cath I Read 084 083 083 083 085 082 083
Prep 303 305 300 304 310 301 302
Hold 001 000 000 000 000 000 000 14112 Hor Def Prep 1 79 175 175 175 180 176 177
Read 3 23 325 325 3 25 330 320 325
14120 +500 V Prep 092 085 085 0 88 090 090 090 Read 405 405 405 405 410 403 405
No Data due to slow TIM sample rate
Table 16-3 Camera 2 (Yellow) Telemetry (Values in TMV)
Orbit
Function Function TV No Name Mode Value 054 151 209 2371 4072
Hold 058 054 049 054 060 056 14201 Focus I Prep 160 156 157 154 160 156
Read 271 265 265 265 270 267
Prep 083 075 082 081 085 079 14209 Grid V Read 225 225 225 225 230 220
Hold 413 405 405 409 410 412
Hold 037 037 033 034 035 035 14211 CathI Read 095 095 095 095 100 095
Prep 305 305 305 305 310 305
Hold 001 000 000 000 000 000 14212 Hor Def Prep 187 185 188 185 190 187
Read 332 325 325 325 330 331
14220 +500 V Prep 114 115 115 115 120 114 Read 429 425 425 425 430 427
LS-2 16-3
Table 16-4 Camera 3 (Red) Telemetry (Values in TMV)
Orbit Function Function
No Name Mode 054 151 209 2371 4072
Hold 065 065 071 070 070 14301 Focus I Prep 1 79 185 1 84 1 83 1 83
Read 285 285 292 290 291
Prep 075 075 075 080 076 14309 Grid V Read 265 265 265 270 267
Hold 408 410 413 418 413
Hold 039 039 039 040 040 14311 Cath I Read 0 54 0 54 0 54 0 55 0 55
Prep 325 325 325 330 322
Hold 000 000 000 000 000 14312 Hor Def Prep 2 05 205 2 05 2 10 2 06
Read 335 335 341 345 341
14320 +500 V Prep 115 115 115 120 115 Read 425 425 425 430 427
LS-2 16-4
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM
LANDSAT-2
SECTION 17
MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
The MSS Subsystem has operated nominally in this period without incident Figure 17-1 shows-the number of scenes imaged at each geographic location this quarter and Figure 17-2 shows images since launch
In these maps only those scenes received by US ground stations are shown Scenes transnntted to Canada Brazil and Italy (32 of total) are not shown
Table 17-1 shows typical telemetxy values since launch All are nominal Table 17-2 shows the history of sensor response to a constant input radiance level Each sensor is sampled at 5 radiance levels and all show essentially the same trends Only one of these levels (the second highest) is listed in Table 17-2 Line length history is also shown in Table 17-2 and is nominal
Recent processing of MSS film from earlier recordings show occasional unscheduled insertions of a single or double group of 4 black and 4 white words in all sensor data Sometimes these anomalous inserts are mistaken for a Line Start Code and result in displacement of the video in an entire mirror sweep (6 Ines on the processed image) A study of a sample of the known anomalies concludes that the data loss is ranshydom is a very sniall percentage of the received data (e g 17 pixels out of every million) and is limited to the region of the South Atlantic magnetic anomaly Similar effects are seen in retrospective examinations of early Landsat-1 MSS processed film This effect is therefore not considered to be a problem at this time
Sun calibrations performed every two weeks show nominal performance
LS-2 17-1
Table 17-1 MSS Telemetry - Landsat-2
T V Orbit Function Name Norm 27 1254 2500 3400 4241 4670 5091
15040 15041
42
MDX -6 VDC (TMV) AD SUPPLY (TMV) AVERAGE DENSITY (TMV)
392 574 172
405 595 171
407 595 230
404 595
239
407 595 2 17
405 595 186
407 595 204
407 595 195
43 44
FIBER OPTICS PLATE 1 TEMP (DGC) FIBER OPTICS PLATE 2 TEMP (DGC)
2230 2230
1813 1787
184 181
2041 1886
2123 1975
1860 1673
2067 1911
2175 2020
45 46
MX TEMP (DGC) ELEC COVER TEMP (DGC)
2559 2309
2338 2025
256 212
2057 2140
2276 2244
2103 1819
2168 2171
2363 2296
47 PWR SUP TEMP (DGC) 2385 1945 210 1983 2119 1816 2011 2162 48 SCAN MIR REG TEMP (DG) 2344 1830 180 1829 2018 1733 1926 2113 49 SCAN MIR DRIVE ELEC TEMP (DGC) 2434 1896 196 1849 2053 1743 1936 2142
15050 51
SCAN MIR DRIVE COVER TEMP (DGC) SCAN MIR TEMP (DGC)
2250 2187
1726 1726
194 179
1828 1809
2020 1971
1737 1726
1941 1908
2121 2089
52 53
ROT SHUT ROUSING TEMP (DGC) SCAN NIR REG VOLT (TMV)
2258 456
2826 47
184 457
1891 457
1980 459
1672 462
1914 457
2028 457
54 55
CAL LAMP CURRENT (TMV) BAND 1 15VDC (TMV)
118 497
117 498
117 497
120 497
117 497
117 497
117 497
120 497
56 BAND2 15 VDC (TMV) 500 50 500 500 500 500 500 500 57 58
BAND 3 15 VDC (TMV) BAND 4 15 VDC (TMV)
488 483
495 500
495 500
495 500
495 500
495 500
497 500
495 500
59 TLM 15 VDC (TMV) 504 506 507 507 507 507 507 507 15060 +12 VDC +6 VDC (TMI) 492 503 502 502 502 502 502 502
61 LOGIC +5 VDC (TMV) 486 481 480 480 482 481 490 483 62 RECT +19 VDC (TMV) 497 503 505 505 505 505 505 505 63 64 65
BECT -19 VI)C (TMV) BAND 1 EVA (TMV) BAND I HVB (TMV)
354 495 503
360 495 OFF
360 495 OFF
360 495 OFF
360 495 OFF
360 495
F
360 495
F
360 495
F 66 BAND2HVA (TMV) 472 470 472 472 472 472 472 475 67 BAND 2 HVB (TMV) 470 OFF OFF OFF OFF F F F 68 69
BAND 3 HV A (TMV) BAND 3 EVB (TMV)
475 465
472 OFF
475 OFF
476 OFF
475 OFF
475 F
475 F
473 F
15070 SHUT MOT CONTR INTEG (TMV) 249 260 257 260 260 260 260 260 15071 SCAN MIRROR DRIVE CLOCK (TMV) 193 20 200 200 200 201 200 200
Thermal Vacuum Test Data at 200C
Table 17-2 MSS Response History - Landsat-2
Quantum Level for Selected Word (0 Black 63 = White)
Change Band Sensor Launch 1 2 amp 3 Quarter This Quarter Since Launch
1 43 41 40 -8 2 41 40 39 -7 3 46 43 42 -7 4 46 45 44 -4 5 44 41 40 -9
6 46 43 43 -7
7 47 46 45 -4 8 44 41 41 -7
2 48 47 46 -4 10 50 48 48 -4 11 48 48 47 -2 12 47 44 44 -6 13 42 41 40 -5
14 44 43 42 -5 15 47 46 47 0 16 47 45 46 -2 17 48 46 46 -4 18 46 44 45 -2
19 25 25 25 0 20 26 27 27 +4 21 32 32 32 0 22 29 30 30 +3 23 32 33 33 +3 24 28 28 28 0
LineLne 3250 3249 3248 006 Length
LS-2 17-34
---
--------------------
-- -- fl--shy
1 -- ---- --- 0------- ~- shy
- - 2 2 2 ---------D M- -- ----shy
[--- deg deg 7_-+_ +
+ --
- --shyt
+ bull
U --- 1l---- i - shy
- F- -- - --- VIT11AWol 14- deg
L [
Figure 17-2 Computer Map of MSS Scenes
LS-2 V Rs REODRt dMOfl p THE 17-78ORItNAL PAGE IB POOR
2
SECTION 18
DATA COLLECTION SUBSYSTEM
LANDSAT-2
SECTION 18
DATA COLLECTION SYSTEM (DCS)
The DCS Subsystem performed nominally during this report period continmng message collection at substantially the same rate
The Alaska ground station commenced receiving DCS messages during this quarter joining Greenbelt and Goldstone During Orbit 4393 on 3 December 1975 the first messages were received at Alaska No more messages were received until 8 December when during Orbit 4457 regular reception was commenced DCS messages are now being collected on 12 orbits of the 14-orbit day rather than the previous 8-orbit cycle This increased the number of messages received in the quarter by 26 but severely reduced the statistic of messages per active orbit Because of the geographical location of Alaska with respect to the present locations of DCPs Alaska up to now receives only about 20 of the number of messages received by Greenbelt or Goldstone while increasing the number of active orbits by 50 Hence the number for Average messages per active Orbit listed in Table 1-1 is reduced substantially (Thus in the prior three quarters the average number of messages per orbit was 164 in this quarter it was 139) The maximum number of platforms received in one day of tis quarter was 110 on 14 January The maximum number of messages received per orbit was 464 on Orbit 5005 on 16 January 1976
There axe 46 users in the data base 246 DCPs have been shipped with 231 in the data base
Table 18-1 shows telemetry values since launch All are nominal
Table 18-1 DCS Telemetry Values
Func - Orbits
No Name 5 1252 2462 3410 4241 4670 5091
16001 Receiver 1 Sig Strength (DBIV) -12334 -12279 -12481 -12400 -12266 -12387 -12202
16002 Receiver 1 Temp (DGC) 2254 2413 2420 2439 2355 2398 2437
16003 Ree-1 Pwr Input Volt (VDC) 235 237 236 237 235 236 236
16004 Receiver 2 Sig Volt (DBM) F F F F F F F
16005 Receiver 2 Temp (DGC) F F F F F F F
16006 Receiver 2 Input Volt (VDC) F F F F F F F
This value is for a CW carrier only it is not valid during DCS message reception F = Receiver 2 was OFF
Figure 18-1 shows the number of DCS messages per 18-day cycle at OCC and the average number of DCPs active per cycle Also shown is percentage of good messages for each cycle
LS-2 18-1
27 26
u
8 25
24 lt 23
ow22 21 - MSGS RECEIVEDlt
) 2
20 19
-
0 18 17
-
lt 0
16
4
- 13
GOOD MG
1I
-3 8-
U 9391
89 7a
U)3
0 0
104 7102 -shy
m
98 -
-1a 96
gt 94
92 - ACTIVE DCPS
Z 90 88 - _
C)
Xl
86
84
CURRENT REPORT PERIOD
gt 82
80 I 2 3 4 5 6 7 a 9 I 11 12 13 14 is 16 17 18 19
CYCLES OF 251 ORBITS EACH
Figure 18-1 DCS Message History
APPENDIX A
LANDSAT-2 ANOMALY LIST
Landsat-2 Anomalies and Observations
Date AnomalyObservation How Observed Comments
Prelaunch Forward Scanner Pressure Leak
Spacecraft Integration
Before launch pressure increased After launch pressure decreased No anticipated effect on Scanner or SC mission
Prelaunch Defective TLM Functions 1264 4002 13200
Spacecraft Integration
Functions are temperatures which are nonshycritical Sensors failed prior to launch Mission unaffected
3875 Non-Landsat OCC authorized Un-encoded command 781 CIU Channel B Off received by spacecraft from HF interference Commands 782 or 786 switch comdecs received at other times
On-Line Non-Landsat OCC Authorized Unencoded commands received in Orbit 619 640 743 1575 1700 2605 3164
31775 MMCA Pitch Flux Density TLM Drift
Off-Line Telemetry decreased 5 counts and indicates increase flux density on charged magnet Investigation underway Probable sensor drift No apparent effect on SC performance
4575 WBVTR-1 Rewind Failure On-Line ECAM Rewind command to WBVTR-1 failed to execute in Orbit 1021 RT commands
failed to execute Operation resumed Orbit 1476 Investigation continuing
51275 WBVTR-1 Failed to RW On-Line See entry 4575
51575 WBVTR-1 Failed to RW On-Line See entry 4575
6975 WBVTR-2 had short RW On-Line WBVTR-2 started RW but stopped preshymaturely WBVTR (1 amp2) investigation still continuing while operation resumed
7275 WBVTR-1 had short RW On-Line See entry 4575 and 6975
8375 WBVTR-1 data did not provide sync to ground station
On-Line One WBVTR-1 head circmt failed to operate25 of data lost in data stream Operation
dscontinued Investigaton committee formed
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
LANDSAT -2
SPACECRAFT ORBIT REFERENCE TABLES
FROM JULY 1975 THROUGH DECEMBER 1976
ORBITS 2221 THROUGH 9890
FLIGHT DAY 160 THROUGH 709
LS-2 B-1
LANDSAT
JULs1979
-M- I l T I SPACECRAV R-FrQENCF I REF CYCLE I
FATr UfAT I AT I I F TS I DAY I II
z-I i i 1 ITQ -r 221l~ b ii-
I IR 1I I P23S- P048 I IAR1Rt I 13 I I
1i I 1RI 163 P263- 2276 I 1qA-POg 15 I I
IR I OAF - w a I 2ell-tr- 1 1i f III~s I
I 6 1 871 165 1 P2 1- P104 1 24P37 1 17 I 8 I
ing 167 1 P3q 2122 1 1- 14 I 1 1 9 1
V IVfU I The I p33 en1 1 a
4 iI 10 I 191 1 J69 1 P347- 2160 1 Pq 1 3 9
i I t93 1 171 1 P37S- P1A 1 7- 70 I 1 9 11 8 9 - --7- -------- - -2 - 1
I 4 I IQ I 173 1 P402- Pa16 1 89 98 I 7 1 9 I
14 1A197 t 175 I P431 2444 1 111126 I 9 1 9 1 I 1IS IU
In I q9 1 177 1 w45R- 2471 1 t4n-153 IT il1 - 9 IIP-if1 I 119C8 1 10 F 7wg kh7
I I po o i 78 1 wP - R - -
IPfC 1 201 1 179 1 P496- 2499 1 AAR-1iI 1 13 1 9 I
- i02 1 -POOW--PJ tt I ----[r--S W -- ---shy
p i Po3 I 1825 14p- Pq7 Ilq-p09 I 15 9 I
P3Va en 189 1o Paz~ c3 I c10 1 9cbo
I P I 205 193 1 9542- 2q5 I 2P5-P37 I 17 I 9 I
-2 n P 8-2 Pamp 1 207 1 85 I PS7o-2qgaI 1-14 I II IO
P5 I T 12deJI I794---w~- 20 Inc
ps 1820 tO 187 1 P59m- PAhi I P9 42 1 a 1 10 1 I 1 al~ I 10 iW I p 1 p
I20 1 P11 1 199 1 P626- 2A39 1 57 70 1 5 1 10 1
shyB-2
LANDSAT-P
AUG 7
Uug I M
GM t ri IGHT I SACECRAVT I REFrRENtE I REA I CYCLE I
UIST LiLT fltil I u~TtJMT I l I I 21 I 92 I 066A- PRt I qq1jp I 10
6I 1 194 1 66- P708 I P7-139 I 0 I 0 I = I 9p7- I WR I 1lt-193 I I ID I ampm j P 0722-P71 I E-467 I 12 1 10 I
a Io1V 18 I Si1 2764 1j1P q5 1 14 1 to g I I I wIlfl et17 I ICJot 1 lb 1 0
I P2 I 200 1 P779- 279P1 I 7w223 1 16 110 I 0 I P194 enub I eC=1sC I I I TO
I 4 I I P907- PAPO I EsR-I)9 I 1 10 IpI
t1 1276- e-2R7 I I I 2 r I20 flia2- I-po6---- 1--0936 ------ l- I 1 Ijr291
Ith I12281 206 1 2a63 2R7AI 44wS6 1 4 1 Itl
it i e I I W871V4vp h00 IU I h I 1 I18 100 paI 891-2QM4I1 71 84 1 61 11
I 0- 22 210 P919- 932 1 q112 I a I 11
P34 1 PR asI
21p 13
1 1
947 Pq99 1 197029 P968 -Iq I-t-14r93-4Itt-
1In1 I It 11 ii
P4 1 226 1 214 1p97Z4- 2987 1 J4miA7 1 12 1 it
- I PS OA
1 228 t 21-P5 -liqrwanait 216 1 loop-3015 I
n ttt 1R015
f I1
W t 4r1
It _ It
IPS 1 240 1 a18 i q030- 3042 Ia 223 1 16 1 It P9
~20 a~Pat Ia aO22 1 220
1 1
a IcS- 3071i1
2-4Pr 21A-991 I
i a IRaI
3 It
1
IS-2Bshy
-L A--NDSAT-P
bPl51711
GHY |GHT I qPAC[CAFRT RNFrRENc REF -YCLE I I U T I UNA LAT OiMSITS IRMIT5 I rI I I J UAy Nte
p -7il- -1l-- l =086 PaI I - IotA loSrq --- - --I P 24 I P23 I -lon- 3113 I fq 42k 3 I 12 I
a 2 1n 22 1T M 312 4 shI Wiez__ I 4 I 247 1 25 I 1129- 3141 I 7 70 I 5 I 12 I1 I I P 7 912p- 3155 7- I 12I I I f4 6 I 1 I 6 I249i 227 I 156- 319 I R9 98 7 1 12 I
o I Psi 1 P29 I RAJAi- 3197 I t11IA6 q I 12 I -N i P -23-- 1 1-9s 3 A -rr- -- -1-2 -shy
toI 253 I 231 1 1211- 3P24 I lkn153 I 1 I 12 I
t- - ts - lrrt
4 11 j BM I I 4 C 12 1 255 1 233 I 1239 3pg 1 A1R-ll 13 I 12 I
I i eMS p 253 37S--18P 9--r-TV-- -T2 -T Ilb I 267 1 235 I 1267- 3AO I 19APOg I 1 I 12 II l --i s -T l3B-----ql-- qr-r-- 2nP3-T- 16- 1 --1E F
StA I 259 1 237 I 3295- 31o I 2P4-P37 1 17 I 12 I i 7 1 2Iet I ego 1 5lW 34Pr I e - Iig I tc I is 2hi1 P39 1323 3q26 I 1- 14 I 131 t= - 2041--e--Q---- 3-3a-rI---tww-w -1-p--r--- ---t I 1 263 1 241 I 1251 364 1 Pq 42 I 3 I 13
PP2 265f 243 1 3379 31921 57 7 I Si 131 a I amp I 4393- 3 409n I Tpm 8 i t 3 13
4 1 P671 245 I q407- 3aOI Mq98 I 7 1 13 1 -vs Phs i -41- At 2 -14-t--1-qqwttt--t-t1 t--V6 I P29 247 I 3435- 34A I 13-12 I1 9 I 13 1 of- a 21 l--- i----- 19- 1 L I I P71I 1 249 I 446P- 3475 1i14M161 1 it I 13 1
I P I amp I 4471- 301t I 1Ztt6 1 I 3 2nlmll 1l 27 t 2 1 iNO e2 1~ 16 9 tI i 1 13l 1 m 1 i 14 0 ~ 1 IiiiiiWi 1
B-4 REPRODUC2ILIIY OF ME -2
ORIONAL PAGE IS POOR
LANOSATP
BF-Tp 1 971
H7t gn7
IAY UA RPSCERqFT I REF Ii I I I I I REFRETCE I CYCLE I UgHl I UAT I LJAT I bN |I i UWMITS 1UAYtNfo I
I 1 01 i ~ () 311 1 1 FII t1 I 2 I 275 1 253 1 iSIR- 3r11 I 1qAP09 I 15 I 13 I
7 I I - 1 1 II 277 PBS q646- 2-sq 2--7 17 13 PsI I S 1 40606 SJRA I IA-S1 181 1
A 1 279 I 267 g 357amp- 3qA7 I I4 1 1 14 I S7 1 R 1 2 amp-r1-iSga- Uil I-- TR- P 14--
I A I PRII 259 Iq60P-3AIS I Pq- 42 1 q21 14 1 W I e I Ib 1 w-WVT 4oS I Ib 1 40 2A3 1 261 I 1630- 3A43 1 57- 70 1 1 14 1
I s - p 26 I SAhD I I W 8 1 I IFi ec 1- 1 I I t I PAS I 263 I 3S -3471 I AR 98 1 7 I 14 I
1is I h 6i7-3A9Sr 9q--TI aeggt I ebF F r-Y-rTshy1 2187 Pb5 I4686- 3A99 I 111-196 1 9 I 14 I
1 In I1l c~~fW1 I I tV T-t7-Tq 3Tr1T 1 1 16 j 2A9 1 267 I 3713- 372A I 4n-153 I I1 14 1
I 1s I p9l1 69 I i741- 375k I 16-1l81 13 14 I is I 4I -70--r---fs--r-7t-tl--S-rtT PG 293 I 271 I 3769- 3792 I 1q9APO9 1 15 1 14 I
3q5 P73I I I 1 1797- 3210 I 224-237 17 14 1
I P4 1 297 I 275 I 1825- 332 I IV 14 I 1 15 I i S- i8-----3-IA t1ST- - tT- -tl I I P99 I 277 I 3R53- 3A66 1 pq 42 I 3I 15
07- 10 1 74R3Ar 1W-567----1---15----I P9 1 391 1 279 I q181- 3A94 I R7 70 I 5 15 I I 1 uF P0 i -5- - 1 1uS0O MIS II--shy1 20 3n2 I Pat I 190q39p 1 g8 I 7 15 I
St S 1I 2f8--1lj9R-3r-3s I--- t - 9 I Sfr-rl-5--1--shy
LS-2 B-5
LANDSATP
NOV 970
I IGi j qRACCRk I REF CLF II REFFNCEIUAiT I DAT I ptdI~q elgTT ---UDY I WwN1-rw 7NJ5li-
I 1 i 38US- r-s--W- 11171- ---- i--I P f 106 [ P84 I I951-3qsl I 10 Is127139 I I I 3nu 85 1 A941 1 n-1in 1g 1 1 I A I 308 I 286 1 3978- 3qqj 1 k-167 I P i i5 I
0 i t5D I P81 I 9h9P II114 l Imo I 15 I I 6 I 310 I P98 I 4006- 4M19 I 1R195 1 14 15 I
I 8 312 I P90 1 4034- 4n47 I 21o-23 1 i 15 I --m 313 p 79T-rfi--nET ---I pl7 -- 7-T ti
I I 31amp I P92 I 4amp062 4075 1 23Re251 I 18 I 15 I 1 ii 3 I 2 I I - lII i I I 12 9 316 I 294 1 4090- 4103 I tq P I p 1 16 I
i Jay1 i 1 1-7 7-- T--- -- -rshy is Pe5rw r ~ shyt4 iI 31i8 r 296 I 4118- 4131 I 4 56 1 a 16 I
i IS i 3 1i 2 -I -l-- -t t-I 1A 31 i P98 I 4146- 419 1 71 R4 I 6 16 1 I 11 I Apt I I 1v 41 hi I fAI IQ 14 I ix I 3P2 I 300 I 4174- 41R7 I 9gil2 I A 1 16 I i s- 30n-t-tfl-1--tt -9-1T------ i9- -16--l--I PO I 32 l4 I 302 I 420P- 42I4 I I17139 1 10 1 16 I I wl1 30E 4215 1-SUusr 1i bt rl- -I P2 I 3P6 I 304 I 4229- 4P42 I 14-167 1 12 1 16 I
ps13 5u P1 - i Ias i p t it I P4 I 3amp I 306 I 4257- 4P70 I 18-195 1 14 1 16 I 1 -pl p 3p99 -- 3O7j 427 1--P4Ii -r-r-m1 1-I A 1320 1 308 I 428i- 4 A 1 In-23 16 1 16 1 1 - V I atI 1 S9 1---t2- 41P I eP -stII rrrIT6 I ps I 382 I 310 I 4313- 4I6 I 231-251 I 18 a 16 I
p 1 3 1 311 i C3 - I TV i I t I I 20 1 33 I 3 1 4341- 494 I tR- 28 I 2I 17 I
B-6 IS-2
LANDlAT-
Lufrc 1915
I I GMT I Fl IGHT I qPACECRAFT I REFrRENCE I REF CYCLE I
I UA[W I LAT I UAT I qtfI q I BRUTM S AYANIT
2P | 336 I 314 4369- 4JR2 I 41 5A I 4 1 17 I
I I328 1 3161 4397- 410 1 7184 I 1 17 1 I 32 I1 s 114 44 I A-1 I I 1i I I I 340 1 18 4425- 4431 912 I A 1 17
SI2 320 4453 4465 I 197-139 1 10 17 I
I 1 1 344 1 322 4480- 4493 I 74-1 67 1 12 I I 11 145 1 d76 4V O I t6flS1f I I 1
1 346 1 324 1 45DA- 4q7 I IA7-1Q I 14 17 --- T-S---ampF-T -325 1 R F7f 19-7f9- TST V I I7 I-a-s 1 226 1 63- 4q49 10- tn-123 I 1- 1 17 1
I 1 380 I 32 1 4564- 4q77 1 1R-251 I iR I 17 I I 1 -3 1 5_1 1 1 1- 1 = 18 I I18 a32 1 320 1 4692 4AD6 I 1q- PA 1 2 is I8 I i- 1 -3 Sa rfltS- er4 9 -n-c 4W I T 1
1 90 1 354 1 332 1 4620- 4A33 I 4q- 56 p 4 18 1S 1- 1 ins I a t4WfT7~Q-- b t
IPP 1 361 334 1 464A-4A61 1 71 84 1 Ap1 18 1 Ps136 1 AS nqg 1 71 i
I P4b i 3F8 1 336 1 4676- 4AR9 I gQ112 I ik 1 18 1 --s-P 1 oss I-a7-t- 9ai7 r-it t2~~- ------ t -t4rk
1 P6 1 360 I 3a8 1 4704- 4716 1IP17-129 1 10 1 18 I - 7 T1 -8--1d----35--l-----7~w-tlo-l-t4n-153 I ----
I P8 1 36hi 1 340 1 4731- 4744 1 15s4s167 1 12 1 18 1 1 9 ISAS 1 3A1 i 4947sattAktt t2 1 hW 1 20 1 364 1 342 1 4759- 4779 I 1MV-1qB 1 14 1 18 I
I iv~-t---43------4773--Mn -t- -tplusmnis-2ns--i-- IS -r----i-s-i-shy
t8-2 B-7
LANDgAT- __________
JAN 197A
GT I IGHT -IFPACERAFT REF CYCL F9-REFRFCr I I UAI I DAY I 3 O - ATT I Y 10ArNe-oL7 I9ffTTS
I I 1 1 1 - -1----a4-4- I r- r - -r---tA F--amph---I P 10 I 345 I 401- 4A14 I 2P4P37 1 17 1 1 1 I A I1 --4 AC j - - --- --7I - -- - ]IRt Im 19--F-----I 14 I 4 I 347 I 4829- 4A4 I 11 I 1 a 19 I
11 I3 4857- 4A70 I 1I- 45 1 1 19 I
I SI B 1 I 4895S 4R98 1 97- 70 1 E 19 1
I 1 1 10 I 353 I 4913- 49Pamp I A - 91R 1 7 19 1 I I I i I I 492I7- 44401 1 m1t I- -- I - 1 --- shy-4---I - - --- 5 ---- 7amp9 9 -z 4 f -T---7z13 -I---T[ 0- - -I IP 1 12 I 355 I 4941- 4S4 I ill-P0 1 9 IS 1
I d 1~ 1 1 6 1 -4955-q7fl~~ rtr4s-r I1 14 I 357 I 4968- 4981 I 14-153 1 11 1 19 1
I 16 I 1 I 359 I 4996- 5009 I jAR-IRI 1 1 3 I 19 1 I 11 I Ift I 01 I U0lo SI)P I l -I I IV I I IS 1 I8 1 261 1 5024- St7 I 19o-09 1 15 I 19 I
I PO I PO I 363 I r052- S19 I 224-371 7 I 19 1 Il1~l~ v--R6 r1h-tf 1 ~ t-r 19 ---
I PP I P2 1 365 1 iogo- SnqSI 1-14 1 1i PO I w0 i 3 6 I u9_- SIM I 1 I I O I 1 P4 1 P4 1 367 1 ci1R-Si1I P9- 42 1 SI1 20 1
-S i6 5 -P r~r~1 r5~--~~0 I P6 1 P6 1 369 1 9136- 5149 1 9770 I SI1 20 1
- 1 el- I liu li I S~w Ir--f - -1-RI eu I P8 I ps 1 371 1m164-177 I Sq9S 7$ PO
a-8 S j- I I e-u I qc0 1 30 I 373 1 9192- 5POS I II-iP6 I 9 1 PO
qiI sI ~7 0-ri-----i-t19I1 -- O-shy
B-8 LS-2
LANDSATsP
FEFS 97A
I I GMT I ri IGHT I qRACECRAFT I REFFRENCE I REF j CYCLE I I LJAIF I UAT I UAT I u~tbI Is I flM TSTA- 1NTfoshy
- i1 a2 1 375 i eP19- fl1 I lolfl I 1] 1 PC t I p I 23 1 376 I q233- 5 46 I 154-167 I IP I 20 I
j -- I S 1 3 0 II -R2i lh --R a i a 0 I 4 I 25 1 378 1 5261- SP74 I iRP-195 I 14 1 20 I 1 56 C b7tb bmm I 1 l I
A 27 1 380 I V2s9 ElfP I 2i223 I 1 1I PO I I I I as 38l5 I141ft I A-1Ip 2T1 I Ie I 8 1 29 I 382 I 5317- 510 I PIA--RP I i I PO I I v U I I1s - 1w-r 1v -T 21 1
10 1
a 1 13o1 92
I 1
384 8
j R345- 5158 2 -e
1 t5 289 4 S
I 21 amp
I I
IIP 1 43 1 386 1 5372- SIsR amp I 4ampq61 21 1
S14 1 45 I 388 I 59401- 5414 I1 71 4 A I 21 I IS- k I 31F7 2
1 1A I 47 1 390 1 s42q- 544 1 9QQl2 I AI PiI 1 1 if 0 091 1 3 0 5 I4 11-12 1 1 21 1
a is8 49 1 392 1 q5457- 54A9 12i7wt39 1 10 1 21 1I V I soI A$S 1 1010U sTfIEP1--1 I PO I I 394 1 95484- 5497 1 154-167 1 IP I Pi I I F3t1- 21 39t-- I Swn---RnrIAT Twrv 7--ts 1 ei1 1 Ip I F53 1 396 1 5512 555 I IR2-i95 1 14 1 21 1
W1 I S a I Sln I ne ts i S L - T-IP4Iamp 1 i I5 398 5540- 55E3 1 21n-223 16 21 11 IA
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LS-2 B-9
LANDSAlr
MAR 197amp
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LANDSATP
MAYs 19T7A
I I GM I F1 IGHT I qRACECRAFT I REFFRENCE I REF CYCLE I
I UAI I UAT I DAT i ITq I 8RBTTS I UA- I NB- I --------------------------- 7-er--- -----------------
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B-12 LS-2
LANDSATeP
-JUN I 97A
I GMT jIPlIGHT ISPACECRAWY I REFFRFNCE I REF a CYCLE I
I ~ I DAY I DAY I UOSIM I URN LIS I UAT I iNo I ------------------------------------ I - -- -shy
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------------------------- ------------------------------------
LANDSAT P
JULj 197A
I I GMT i 1GHT I SPACECRAFT I REF REjCE I REF CYCLE I
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LANOSAT-9
AU a1976
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I UNIF I A I I 777 I7I I Qwtsi is I 1XT I NO0 I
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S-2 B-15
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-------------------------------------------------------
LANDSAThP
flCTs 1976
I MT i F IGHT I SaACECRAFT I REFFPFNCE I REF I CYCLE I T I fr---Ishy--1 I pNs I5 DAY 5 ep Lib U
3 I2 276 I 619 1 622- SA3 pq 42 I
I 2 621 I 650- RA I 57- 70 1 S 1 34 132781
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LS-2B17
LANDSA- P
NOV 1970
I I 6MlT I Fi IbHPT I qRACECRAFT I REFIrKNtE I REF c YcL I
I UAIF I UAY I UAY I 5NffTW-7 BRffWTTS I UAY I N8I-
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RFPRODUWITYM OF THM LS-2ORIGMNAL PAGE FP001h B-18
--LUANO T-0
DELP 197
I I GA I IL3HT I sPACECRAFT I REFF rNCI I REF I NCL I
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---- ------------- --- -- B------------------shy
LS-2 B-1920
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
APPENDIX C
LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD
No Document No Title and Date
I IN23-ERTS-16G WBVTR-2 of Landsat-2 Second Rewind Dropout Anomaly dated 102875
2 1N23-ERTS-166 Second Periodic Test of RBV in Landsat-2 dated 111275
3 1N23-ERTS-167 Probable Incipient Malfunction of MSS on Landsat-2 dated 111875
4 liM3-ERTS-168 WBVTR-1 in Landsat-2 Attempt to Dislodge Possible Particle in K-1 Relay dated 1976
5 1N23-ERTS-169 Landsat-2 MSS Line Start Anomaly Investigation Reference GSFC Malfunction Report fl04940 dated 11976
LS-2 0-12
GENERALQ ELECTRIC
Headquarters- Valley Forge Pennsylvania E3 Daytona Beach Fla DEvendale Ohio
Space Division U1-untsvrlle Ala U Bay St Louis Miss U Hlouston Texas 0OSunnyvale Calif
UBeltsville McLUTacoma Wash 0l Palmdlale Calif QBedford Mass
[]Washington D C Area
