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Commissioning update

This report details the commissioning activities of the Ground Segment (GGSPS), documenting functional and calibration tests from December to May. Key topics include history of operations, Earth view observations, normal mode activities, torque levels, and significant maneuvers. Specific tests like the Alpha value scan, sensor swaps, and the impact of operating modes on performance are highlighted, alongside results from lunar observations and stray light evaluations. Future commissioning plans are also referenced as part of ongoing enhancements in functionality and accuracy.

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Commissioning update

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  1. Commissioning update B.C.Stewart RAL Ground Segment (GGSPS) Report

  2. Topics • History • Functional tests • Calibration tests Ground Segment (GGSPS) Report

  3. History • 11th Dec SUNBLOCK • Torque level 4 • 12th Dec 16:01 – 13th Dec 09:48 NORMAL (262) • Earth view centered • 16th Dec 13:47 - 18th Dec 16:35 NORMAL (262) • 15th Jan 16:41 – 16th Jan 13:08 NORMAL (262) • 16th Jan 13:40 – 22nd Jan 10:55 NORMAL (282) • Extended Earth scan, Torque Level 3, SEVERI ON/OFF • 22nd Jan 11:14 – 22nd Jan 12:09 NORMAL (262) • TOT + TOT, asymmetries Ground Segment (GGSPS) Report

  4. History(2) • 22rd Jan 12:17 – 24th Jan 14:15 0.0° step size ‘NORMAL’ mode • Fixed mirror angle • CALMON diode v. detector signal variation over ~48 hours • Attempt at limb observation • Moon observations 23rd Jan 15:39 – 17:17 • 24th Jan 14:23 – 30th Jan 17:15 NORMAL (262), TL 3 • 28th Jan 10:03-12:57 TL’s 1 and 2 • 2 days (25th-26th) when SEVERI OFF • 30th Jan 17:26 – 31st Jan 15:00 PSF ‘whole Earth’ at x5 resolution • 31st Jan 15:12 – 3rd Feb 15:53 NORMAL (262) • 1st – 2nd Feb SEVERI OFF Ground Segment (GGSPS) Report

  5. History(3) • 3rd Feb 16:05 – 6th Feb 09:45 Deep Space (262+260) • Heaters 1, 2 ON/ OFF over ~2 days • Serendipitous lunar observations • Stray light • 6th Feb 09:47 – 10th Feb 13:51 NORMAL (262) • Includes change to Earth sensor • 10th Feb 13:55 -14:08 Alpha value scan • Attempt • 10th Feb 15:10 – 15:42 SW CAL • ‘serendipitous’ Earth limb in ‘dark’ observation • 10th Feb 15:47 – 28th April SAFE mode • Sun avoidance period Ground Segment (GGSPS) Report

  6. Current/ future • 28th April 11:44 – 13:30 SUNBLOCK TCF ‘null’ ON/OFF 15:23 – 16:11 SUNBLOCK TCF ‘step’ ON/OFF • 28th April 16:13 – 9th May 14:49 NORMAL mode • 1st May 11:16 – 19:28 Sensor swaps • SW CAL 30th April 14:53 • 9th May 14:49 - SAFE mode • 13th May – MSG manoeuvre • 19th May - • Alpha values • Mirror timing • Correlated observations with CERES –last 2 weeks in May, early June • 6th June – PSF Ground Segment (GGSPS) Report

  7. Functional tests • MSG System Commissioning [GIFRPT] GERB Instrument Functional Test Report covers (DRAFT 29/01/03) • Mode switching (OFF, ROM, SNOOZE, SAFE, SUNBLOCK, NORMAL) • Descan Mirror operation • Quartz Filter operation • Detector operation • TMTC • Scanning timing • Thermal control • Safety procedures and limit checking • Patch and dump • Torque levels + TCFs Ground Segment (GGSPS) Report

  8. CalibrationsTests • Verification of the on ground characterisation of the pixel time constant corrections (to be done) • Characterisation of the Calibration Monitor (2 SW CAL + 48hr mirror fixed) • Assessment of the deep space scan (24 hour obs) • Evaluation of the lunar scan for calibration purposes (1 obs) • Evaluation of each detector’s PSF (1 day whole Earth + SW CAL ‘dark’) • Evaluation of the GERB calibration modes • In-flight characterisation of misalignment (N.B. addressed by RMIB analysis early in the mission and after each manoeuvre throughout the mission). New • Mirror face offsets (to be done) • Stray light (to be done) Ground Segment (GGSPS) Report

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