Proba-V QWG#7 Flight & GS status. 3 4 May 2018 ACRI, Sophia-Antipolis

Transcription

1 Proba-V QWG#7 Flight & GS status 3 4 May 2018 ACRI, Sophia-Antipolis

2 Orbit status Slide 2

3 Orbit status LTDN evolution: 7 May 2013: 10:44:30 1 Dec. 2014: 10:51:08 26 Apr. 2017: 10:36:26 Oct 2017: 10:30 1 May 2018: 10:20:29 After 5 years: 1 June 2018: 10:18:54 Jun 2019: 09:55 Dec 2019: 9:40 Jun 2020: 9:25 Slide 3

4 Orbit status Slide 4

5 Platform status Slide 5

6 Platform key parameter Satellite System mode : Nominal Observation with automatic transition to Calibration mode. AOCS mode: Geodetic with all the units available. Primary lane selected with the use of associated units (AOCS IF 1, GPS 1, MM 1, XTX 3) and of the wheels 1, 3 and 4. Sun bathing mode enabled (with GPS ON). During this period the system was very stable: Monthly Platform availability between 99.0% min and 99.9% max for the last 5months. Pointing performances well within requirements Power budget largely positive and stable Thermal subsystem stable No on-board failure, both primary and redundant chains available. One safe mode in March lasting less than 4 hours. Slide 6

7 Platform key activities Since the return to the primary lane, the period between on-board reconfigurations has increased (74h42min in Feb/March). Since the yaw manoeuvre of July , the number of decompression errors is very low. Antarctica acquisitions performed under standard calibrations SNOW from 24 October 2017 to end of February. Memory overwriting events in January (6, 25, 26, 27, 30, 31) GPS week roll-over: Complete firmware updated (GPS unit 2 on Dec. 7, unit 1 on Dec. 12). EPT off-pointing measurements campaign from December 7 to February 26. Coordination done with VITO. Slide 7

8 Platform key parameter Slide 8

9 Status AOCS: pointing performance Observation mode: obtained pointing accuracies 2018/Q1 (almost identical than previously reported) Error at confidence level Error required [arcsec] Error measured nominal [arcsec] APE 68% APE 95% APE 99.7% RPE 1.5s 95% The AOCS pointing performance is far better than the requirement Slide 9

10 Status AOCS units Unit Status remark Star tracker nominal Temp Head nominal well below 0 C: Maximum: -3.89C and -1.45C Average: Cand -7.26C QS report 2018/Q1 GPS receiver nominal 99.4% fix availability (ADS-B known interference on the GPS) QS monthly report Feb/Mar 2018 magnetometer nominal Reaction wheels nominal No wear detected so far Magneto-torquers AOCS IF nominal nominal AOCS overall status: all is nominal and performances met by far Slide 10

11 Status Power Power summary 2018/Q1 Mode Nominal mode Bus average consumpti on [W] S/A average generated power [W] Energy budget margin [%] Minimum battery voltage (max = 29.2V) V Power budget largely positive and stable in time Slide 11

12 Status Power Slide 12

13 Status Power Slide 13

14 Status Power Units Unit In-orbit status Battery nominal Battery voltage nominal. Temperature nominal (2018/Q1 average C, min C) nominal (> 6 C no heater required) Solar arrays nominal No degradation of the solar cells can be observed Power conditioning (ADPMS) nominal Power conditioning (efficiencies) as expected All units within power budget The power situation is very stable, showing no apparent degradation of the solar arrays, battery, nor power distribution system Slide 14

15 Data handling status Unit In-orbit status remark ADPMS nominal Only events are single bit error trap 0x11 (automatically corrected) in the MPM (50 occurrences on prime and 9 occurrences on redundant MPM SDRAM since launch). 34 occurrences in a period from Nov. to Feb. on 2 addresses. Full flash dump monthly execution for bit-by-bit comparison purpose. Mass memory Nominal with work around Latch-up behaviour detected in orbit. On board S/W work around in place. Slide 15

16 Data handling mass memory anomaly Mass memory anomaly statistics Location: Generally SAA Occurrence: on average once per 72h42 min for lane 1 Potential data gap: 3 min per occurrence (when over land) Figure 6-20: MMM SRAM multiple or many single (>1000) EDAC error map since launch Slide 16 Source: Autonomous_Recovery_History_Report_2018_03_18_05_06_24.log

17 The table below shows the statistics for the multiple bit errors on the MMM SRAM and subsequent autonomous reconfigurations. Data handling mass memory anomaly /05/ :35 8/07/2013 1:05 24/08/ :18 24/09/2013 2:30 24/10/ :03 27/11/2013 4:07 7/01/2014 2:27 20/02/ :25 19/03/2014 0:25 11/05/ :33 2/07/ :29 1/09/2014 2:18 7/10/ :36 20/11/2014 1:18 25/12/ :39 25/01/2015 3:44 7/03/ :59 27/04/ :24 1/06/ :12 27/07/ :31 8/09/2015 3:56 24/10/2015 0:49 30/11/ :53 25/01/ :13 22/02/2016 0:43 5/04/ :18 27/04/ :37 14/05/2016 2:16 9/06/2016 4:17 4/07/2016 3:23 29/07/2016 2:31 14/08/ :48 3/09/ :40 19/09/ :48 7/10/ :09 25/10/2016 3:19 14/11/2016 2:37 2/12/2016 2:30 16/12/ :42 7/01/ :52 20/01/2017 3:00 10/02/2017 6:40 4/03/2017 2:07 23/03/ :12 9/04/ :25 4/05/ :50 27/05/ :16 5/07/ :37 15/08/2017 9:21 17/09/ :28 22/10/2017 9:18 25/11/2017 2:15 12/01/2018 1:17 16/02/ :11 0 Figure 6-19: MMM SRAM latchup event interval + moving average over last 20 occurrences [days]. The red line shows the ADPMS lane (0 is primary, 1 is redundant) Slide 17 Note: There was a period from 7/7/2016 to 14/7/2016 on ADPMS primary lane. This is not shown in the graph

18 RF S and X band duty cycle At the COMMUNICATION request of Project, since SYSTEM March , only the experimental GaN X-band transmitter is used for the X-band passes. The following graph show the duty cycle for S- and X-band transmissions over the last quarter. Figure 4-8: Duty cycle for S- and X-band transmissions over the last quarter Slide 18 Conclusion: The weekly switch between X-band transmitters is disabled. Only the experimental G

19 Instrument status Slide 19

20 within the MMM. There were 6 replacements during the reporting period. Instrument Status VI INSTRUMENT Fully functional The following graph shows the daily spectral imagers duty cycle for the last quarter. All calibration requests were correctly executed. Figure 4-60: Daily SI duty cycles over the last quarter Slide 20 Figure 4-61 represents the imaging zones over the last quarter. It is a histogram of the latitude and longi

21 MMM usage MMM NB FREE SECT always > 237 Slide 21

22 MMM usage Slide 22

23 Instrument Thermal Optical bench thermal variation ~ 1 C variation per orbit ~ 1.5 C variation per day Confirming excellent thermal performances of radiator and bench Slide 23

24 Instrument Thermal Optical bench thermal variation since beginning of exploitation phase Slide 24

25 Instrument Thermal Optical bench thermal variation 15 April 2018 Slide 25

26 Report on anomalies Slide 26

27 Report on anomalies: Decompression errors Since July 4, after the first calibration yaw manoeuvre of July 3, the number of decompression errors remains very low (~ negligible, see VITO monthly report table). Slide 27

28 Report on anomalies AR status: none in open status. There were 3 anomaly reports recorded in this reporting period: SAT AR 19/ : GPS2 switched-off by Event-action 224. SAT AR 10_7/ : Wheel TC verification error : Wheel 3, 11 Dec For recording only. No mission impact. SAT AR 18/ : Erroneous velocities in the navigation solution of the GPS receiver leading to Satellite Safe Mode. Slide 28

29 Report on anomalies: SAT AR 19/ : GPS2 switched-off by Event-action 224 GPS1 switched-off by Event-action 222 Occurred during the GPS firmware update. Update of monitoring OOL counter done for both GPS monitoring done on Jan. 8. AR Status: resolved, proposed for closure. Slide 29

30 Report on anomalies: SAT AR 18/ : Erroneous velocities in the navigation solution of the GPS receiver leading to Satellite Safe Mode On Sat. 23 September at 03:54z, the GPS receiver unit started to give erroneous velocities in the navigation solution. Few minutes later at 04:11:26z, event 254 (EVT_AOCS_NO_CONTROL) was triggered with the return to safe mode. During the next S-Band pass (19769), the nominal Observation mode was automatically commanded by ground TC s at 09:37:53z. Safe mode for less than 6 hours: from 4:11z. to 9:37z. A similar issue with the GPS occurred already from T10:02:00 UTC until T11:23:00 UTC. But no safe mode. QinetiQ Space is proposing to add a new monitoring to avoid such behaviour in the future: simply power-cycling the GPS receiver should resolve the problem with limited impact on the operations. Upload of the new monitoring on ORBEKF_fdi flag done on Nov. 20 and made permanent on Nov. 23. Slide 30

31 Report on anomalies: SAT AR 18/ (cont d): Erroneous velocities in the navigation solution of the GPS receiver leading to Satellite Safe Mode New occurrence on Sun. 11 th of March at 06:21z, the GPS measurements were approximately correct, but the position and velocity errors were clearly much higher than nominal. The Kalman filter residuals were too high, hence triggering an FDI. At 06:41:48z, the event 254 (EVT_AOCS_NO_CONTROL) triggered with the return to safe mode. During the next S-Band pass (21965), the nominal Observation mode was automatically commanded by ground TC s at 10:33:17z. The corrective action which power-cycle the GPS unit in similar condition was not implemented correctly in November The both monitoring related to GPS pre-processing FDI and ORB_EKF FDI flags were correctly updated on Tue. 13 th of March. AR Status: resolved, proposed for closure. AI6.02 QINETIQ to set up a new monitoring process on GPS data allowing to perform a power-cycle of GPS instead of the switch to Safe Mode [Nex QWG]: Closed. Slide 31

32 Ground Segment status Slide 32

33 Ground Segment Overall Ground Segment & Operations status: Nominal. The satellite and ground segment operations, including its Vegetation Instrument acquisition and calibration requests, are running nominally. The Mission Operations Centre is fully operational. ESA/Redu centre supports all planned passes (3 S-band passes per day). The data downlink is shared between the SSC stations located in Kiruna, Alaska and Inuvik with 10 X-band passes per day. Slide 33

34 Ground Segment X-band status: Total Successful Failed Degraded Cancelled Signal/data delay November /1 1 December /0 0 January /0 0 February /0 0 March /0 0 April /0 0 Slide 34

35 X-band status: Acquisition performance is very stable with only very few frame gaps. 7 missed and 1 cancelled passes since November. 7 missed: 1 RF lock instability & 1 files problem in Alaska, 3 no data recorded & 1 config. problem in Kiruna, 1 X-band down converter set-up problem in Inuvik. The passes classified as degraded: - due to signal degraded: signal drop during the pass above 5 deg., RF I/F, wind - or due to data file transfer delay. Slide 35

36 Ground Segment None recorded Close approach notifications from ESA Space Debris Office Slide 36

37 Ground Segment Anomalies & Changes Ground Segment anomalies: 4 new REDU GS AR open. None blocking. AR0746: No TC received by S/C during Pass on Nov. 18. Open. AR0767 : Internet connection lost on March 13 from 03:13z to 09:33z due to ISP problem. No operational impact. Closed. AR0768 : Blockage of automated by ISP on March 19 am. Address recorded as a trusted source. Solved. Closed. AR0776: Redu pass on Apr. 19: Wrong AERR file selected by HPVEE program. No TC sent to S/C but all data (S/C TM, Techno-demo data) were recovered from back-up chain (RED4/IMBU BBE12). Solved. Closed. Managed via Redu Anomaly/Ticketing system (TANOR) and reported in Weekly Report. Slide 37

38 AI6.08 REDU Ground to investigate Segment how often TLE have been used in the past and to assess feasibility of implementing an operational monitoring of the GPS performance [Next QWG]. Ground parameter monitoring put in place for duration > 60 sec (AOO099 GP1 delay to recover=0 and AOO077 ORBANYoutflg=1). List of occurrences reported to VITO & QS ( 26 Feb. 2018): 2015: : 9 ( but 1 at the switch to primary lane) 2017: 4 (but 1 at the switch to primary lane, 1 in safe mode and 1 during the GPS1 firmware update activity) 2018: 0 recorded until now Slide 38

39 Thank you!