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Moblas 8 Return to Operations
16th International Laser Ranging Instrumentation Workshop
Poznan, Poland
October 16, 2008
Scott Wetzel, Howard Donovan, Dennis McCollums, Thomas Oldham, Don Patterson, Alice Nelson, Michael Heinick
Honeywell Technology Solutions Inc. Lanham, MD USA 20706`
David Carter, Curtis EmersonNASA Goddard Space Flight Center, Code 453, Greenbelt, MD, USA 20771
216th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Abstract
• The MOBLAS 8 station located on the island of Tahiti has been operational at that location since 1997. Recently, in 2007, the station suffered from multiple failures of components and subsystems. Due to the changeover of station personnel and the removal of HTSI from the island to help with the operations and maintenance in 2004, the multiple failures of the system caused the MOBLAS 8 system to be inoperable in March 2007. Working closely with NASA, CNES, and UFP, HTSI developed a training plan for the station manager from the Moblas 8 site as well as the TLRS-3 station manager from Arequipa, Peru. Following the training back at NASA's Goddard Space Flight Center (GSFC) in Greenbelt, Maryland, the MOBLAS 8 Station Manager worked with HTSI personnel to repair subsystems and components at GSFC. Later, two HTSI engineers traveled to the MOBLAS 8 station to work with the Station Manager and the UFP and CNES crew to complete the system and site repairs, resulting in the restart of operations at this critical site in the South Pacific. This paper chronicles the work that was planned and executed along with the benefits to the NASA, UFP, CNES and the ILRS with the repairs and efforts to return the station to operations.
316th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Moblas 8 Background
• Moblas 8 was re-deployed from Quincy, CA to Papeete, Tahiti French Polynesia in 1997 as part of NASA’s Cooperating SLR program.
• Prior to the start of operations, the original French station manager was trained on SLR operations and maintenance in Maryland.
• HTSI technical staff was periodically stationed at Moblas 8 from 1997 to 2003.• HTSI technical staff finally departed in 2003. • Between crew turnover and no permanent HTSI presence, no solid technical
knowledge of Moblas O&M remained on station.• Through multiple failures the system went off-line with major MPACS • issues in 2007.
416th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Moblas 8 Timeline 1997 - 2001
MOBLAS 8 Timeline
0
1000
2000
3000
4000
5000
600019
97-0
1
1997
-04
1997
-07
1997
-10
1998
-01
1998
-04
1998
-07
1998
-10
1999
-01
1999
-04
1999
-07
1999
-10
2000
-01
2000
-04
2000
-07
2000
-10
2001
-01
2001
-04
2001
-07
2001
-10
# N
orm
al P
oin
ts
HEO
Lageos
LEO
Air Conditioner
GPS Power SupplyController Computer/Monitor
Laser
MPACSRadar Replacement
High VoltagePower Supply
Gating Module
MPACS
Olivier Charade Training at GGAO
Olivier Charade (Training at Quincy
MOBLAS 8 Arrival in TahitiOlivier Charade Station Manager
HTSI - George Davisson and Mel Sigman arrive on station for station setup
George Davisson leaves stationMel Sigman stays as HTSI rep
Mel Sigman leaves George Davisson returns to station
George Davisson leaves
George Davisson returns to station
Olivier Charade leavesNicholas Blanchard Station Manager
Tahiti Personnel
Station down / Repairs
HTSI Personnel
516th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Moblas 8 Timeline 2002-2006
MOBLAS 8 Timeline
0
1000
2000
3000
4000
5000
600020
02-0
1
2002
-04
2002
-07
2002
-10
2003
-01
2003
-04
2003
-07
2003
-10
2004
-01
2004
-04
2004
-07
2004
-10
2005
-01
2005
-04
2005
-07
2005
-10
2006
-01
2006
-04
2006
-07
2006
-10
2007
-01
# o
f N
orm
al P
oin
ts
HEO
Lageos
LEO
George Davisson retiresKen Tribble Arrives
Ken Tribble and HTSI leave station
Nicholas Blanchard leavesKeitapu Maamaatuaiahutapu Station ManagerYannick Vota (lead technician) arrives
Keitapu Maamaatuaiahutapu leavesGuilhem Barruol Station Manager Guilhem Barruol leaves
SafetyInterlock
MPACS
High VoltagePower Supply
CircuitBreaker
Nimbin PowerSupply
HP5370
Laser SHG
PhotodiodeBatteries
Receive CableTranslator Alignment
Discriminator
Radar
MPACS
MPACS
Laser HeadCable
ProcessorComputer
Radar
AirConditioner
RadarPower Supply
ControllerComputer
LaserOscillator
RadarController
Tahiti Personnel
Station down / Repairs
HTSI Personnel
616th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Moblas 8 Timeline 2007-2008
MOBLAS-8 Timeline
0
1000
2000
3000
4000
5000
6000
2007
-04
2007
-05
2007
-06
2007
-07
2007
-08
2007
-09
2007
-10
2007
-11
2007
-12
2008
-01
2008
-02
2008
-03
2008
-04
2008
-05
2008
-06
2008
-07
2008
-08
2008
-09
# N
orm
al P
oin
ts
HEO
Lageos
LEO
HTSI -Dennis McCollums and Tom Oldham arrive
Tahiti Personnel
Station down / Repairs
HTSI Personnel
Controller Computer UpgradeProcessor / Controller Software
MPACS
Yannick Vota Training at GCP and GGAO
MPACS Repair
Station Inspection / Major Facilities Repair & Maintenance / System Repair / Utility PowerInspection & Repair / Station & Spares Inventory
MPACS Repair and Install
OAM Repair
Laser Chiller Repair
Crystal Saturable Absorber installation
Dennis McCollums and Tom Oldham leave
Crew Training for Station Ops / Facilities Maintenance / System Repair / New Laser / New Computer
OAM
OAM Repair
UPS Installation
716th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Repairs, Optimizations & Alignments Performed
• In February 2008, the Station Manager traveled to HTSI for intensive training on subsystem, and component level repair and operations.
• Beginning in March 2008 HTSI sent two engineers to Moblas 8 to perform system repairs, upgrades and on-site training to the crew.
• Repairs to the system included:
- Main system power cable, system ground cable, laser high voltage cables, laser main power cables.
- Low loss Receive Signal cable evaluation and replacement
- OAM, Daylight filter, ranging camera, MET-3
- Optics repair/replacement and alignment
- MPACS
- Radar
- HP5370B TIU
- Console issues
- Laser Chiller
- Spares restocking
- Multiple power supplies
- Facilities repair and maintenance, including HVAC and all trailers
•
816th International Laser Ranging Instrumentation WorkshopPoznan, Poland
• Upgrades performed to the system included:
-Saturable Absorber
-Controller Computer including all software
-Processor Computer software including Restricted Tracking, data processing, and CPF
-Laser head cables
-High Voltage power supply
-O-scope
System Upgrades Performed
916th International Laser Ranging Instrumentation WorkshopPoznan, Poland
• Returned system to full operations following no operations for 18 months due to hardware failures•Overall system performance was verified by performing
LEO and MEO satellite passes, as well as performing several stability, CFD, and TIU verification tests. - Data quality was nominal with calibrations 4 – 5 mm RMS
- LAGEOS passes 8 – 9 mm RMS. One LAGEOS pass netted 5,600 hundred returns with 8.3 mm RMS.
- For the first time since 2003, tracked a HEO satellite the week of 9/29/08, the GLONASS 109, obtaining RMS values 10 – 15 mm.
• Number of observations per pass increased dramatically• Crew now better trained with Station Manager receiving
additional “hands on” training in Maryland
Results of the Repair / Upgrade Effort
1016th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Post Effort Look at the Data - LAGEOS
MOBLAS-8 Lageos6/18/2008
-80
-60
-40
-20
0
20
40
60
80
9:14 9:21 9:28 9:36 9:43 9:50 9:57 10:04 10:12
Res
(m
m)
Residuals
Normal Pts
CAL TGT OBS ACPTD REJ ITR RMS (CM) DELAY (NS) SHIFT (NS) SHIFT (CM)
PRE B 1005 1002 3 2 0.39 109.470POST B 1002 996 6 2 0.35 109.441COMB B 2007 1997 10 4 0.43 -0.030 -0.443
rej rej Sat station date time #obs bins bins obs sig(mm) skew kurtos 7603901 71240802 06/18/08 09:18 6102 23 0 70 7.9943 0.1432 2.90
1116th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Post Effort Look at the Data - Jason
MOBLAS-8 Jason6/18/2008
-100
-80
-60
-40
-20
0
20
40
60
80
100
10:55 10:56 10:58 10:59 11:00 11:02 11:03 11:05 11:06 11:08
Res
(m
m)
Residuals
Normal Pts
CAL TGT OBS ACPTD REJ ITR RMS (CM) DELAY (NS) SHIFT (NS) SHIFT (CM)
PRE B 1007 1000 7 2 0.34 109.439POST B 1004 997 7 2 0.33 109.437COMB B 2011 1997 14 2 0.34 -0.002 -0.035
rej rej Sat station date time #obs bins bins obs sig(mm) skew kurtos 0105501 71240802 06/18/08 10:57 900 43 0 17 6.8498 0.1124 2.86
1216th International Laser Ranging Instrumentation WorkshopPoznan, Poland
Items Remaining to Complete
• Repair, align, and verify the Radar subsystem• Repair and verify HSLR and HEO
tracking abilities• Verify system testing of the spare
HP5370B TIU• Verify tracking oscilloscope EC• Assist with the new chiller
installation• Receive / review / provide feed
back on the revised CNES design proposal for the HVAC system• Complete the V Plate upgrade for
the mount lower / upper revolution switch