MSG-1 - PROGRAMME STATUS

GIST-19 Meeting 27-29 August 2003 1

MSG-1 - PROGRAMME STATUS

Presentation to the GIST-19 meeting


CURRENT SCHEDULE SITUATION (as of 26th August 2003)

Satellite • Orbit inclination reduced to 1.3 deg now (August 2003)• Delta Satellite Commissioning Result Review (CRR) held successfully mid July to review mainly

SEVIRI testing. Outcomes: • the MSG raw images are of excellent quality and can be rectified well within the specified

accuracy as demonstrated by the IQGSE; • the radiometric and geometric performance are met with margin;• measured outages are within specification;• This initial performance assessment is expected to be further confirmed as part of the on-

going testing activities;• A limited number of tests remains to be completed, mainly to confirm the geometric

performance and outage duration.


SEVIRI Noise Performance (To be confirmed) Chan

nelAbsorption

Bandand Channel

Type

SpectralBandwidth

(m)

In-Flight RadiometricNoise results (specifications

at EOL)

HRV Visible HighResolution

0.6 to 0.9 2.84 (1.20) at 0.28% of theMDR

VIS0.6

VNIR CoreImager

0.56 to 0.71 159 (10.1) at 1% of theMDR

VIS0.8

VNIR CoreImager

0.74 to 0.88 53 (7.28) at 1% of the MDR

NIR1.6

VNIR CoreImager

1.50 to 1.78 10 (3.00) at 1% of the MDR

IR 3.9 IR / WindowCore Imager

3.48 to 4.36 0.105 K (0.35) at 300 K

WV6.2

Water VapourCore Imager

5.35 to 7.15 0.05 K (0.75) at 250 K

WV7.3

Water VapourPseudo-Sounding

6.85 to 7.85 0.060 K (0.75) at 250 K

IR 8.7 IR / WindowCore Imager

8.30 to 9.10 0.07 K (0.28) at 300 K

IR 9.7 IR / OzonePseudo-Sounding

9.38 to 9.94 0.11 K (1.50) at 255 K

IR10.8

IR / WindowCore Imager

9.80 to 11.80 0.074 K (0.25) at 300 K

IR12.0

IR / WindowCore Imager

11.00 to13.00

0.11 K (0.37) at 300 K

IR13.4

IR / CarbonDiox. Pseudo-

Sounding

12.40 to14.40

0.295 K (1.80) at 270 K


SEVIRI HRV L1.5 Image SW Europe (25/08/2003)


SEVIRI HRV L1.5 Image UK (25/08/2003)


SEVIRI HRV L1.5 Image UK (25/08/2003)



Ground Segment (GS) and Operational Readiness

• Commissioning phase B started 30 June using the final Ground Segment with IMPF (GS V1).

• IQGSE: Considered ready for next eclipse season.

• IMPF: Verification and tuning with real SEVIRI data on-going expected to be completed in August.

• System calibration/validation started in August and will last 6 weeks.



Alternative dissemination

• SEVIRI images dissemination over Europe started in May 2003;

• Availability of SEVIRI images > 90 % in June & July;

• Dissemination over Africa by end 2003.

• End of disruptive commissioning tests and thus regular dissemination of SEVIRI images planned by end August 2003.


GERB OPERATIONAL DETAILS (as of 26th August 2003)

• GERB-2 operations since the last GIST– 09 to 14 May 2003 GERB in SAFE mode following the triggering of the

AutoSAFE function caused by a DSM telemetry out-of-limits.– 25 to 28 May 2003 GERB in SAFE mode following a DSM telemetry out-

of-limits. The limits were widened to prevent this type of error triggering another AutoSAFE.

– 29 to 30 May 2003 GERB switched OFF by the platform as a result of an anomaly during a SEVIRI calibration. Spacecraft monitoring to be altered to prevent this category of shutdown.

– 11 to 12 June 2003 TSOL test results in a few periods of lost GERB data.– 14 June 2003 Electronically despun antenna enters “fixed beam mode”

causing the loss of SEVIRI and GERB data.– 15 to 20 June 2003 GERB in SAFE mode, while antenna problem fixed.– 24 June 2003 TSOL test results in a few periods of lost GERB data.– 15 August 2003 GERB in SUNBLOCK for sun avoidance season.



• Planned GERB-2 Operations– For the Autumn 2003 sun-avoidance season (started 16 Aug 2003) GERB is in

SUNBLOCK mode.

– GERB will be returned to normal operations 1 November 2003.



• GERB-2 operational precautions – For the following sun-avoidance seasons, EUMETSAT will nominally

switch GERB-2 to SUNBLOCK 2 hours in advance of the identified sun avoidance period and will ensure that the GERB is returned to NORMAL mode within 1 hour of the end of the period. This implies ~ 4.5 to 5.5 hours of outage per day.

– GERB will be placed in SUNBLOCK mode for MSG sensor swaps performed during the sun avoidance season. Outside the sun avoidance season no specific action will be performed, although a brief (a few minutes) data outage will occur when the sensors are swapped.

– GERB will be placed in SAFE mode for MSG manoeuvres: • N-S manoeuvre => 30-60 mins outage every 6 months,

• E-W manoeuvre => 30-60 mins outage every 3 months



• TSOL Investigations – Three effects have been observed on the E-W earth centring of the

GERB and SEVIRI images:• Daily oscillations

• Midnight oscillations

• Jumps when switching between north and south earth sensors

– These effects are thought to be due to a combination of satellite diurnal longitude drift, earth sensor behaviour, satellite spin axis orientation and satellite inclination.

– A number of tests have been run in an attempt to better understand and characterise the phenomena.

– Investigations continue as to whether these phenomena can be reduced and/or reliably predicted in advance.




OTHER GERB INSTRUMENTS (as of 26th August 2003)

• GERB-1– IEU and IOU were returned to RAL 31 July 2003 for battery fix and

spectral re-calibration.

• GERB-3 – Sent to Alcatel for integration on MSG-3.

• GERB-4– ATP given to RAL mid-April ‘03.

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MSG-1 - PROGRAMME STATUS