1. 18/01/2007 MetOp A - IASI FM2 : AR review 1 AR review meeting The goal of this meeting is to take position on the ARs raised during the IASI SIOV before the IASI TRB Planned on the 30/01/07 This presentation contains the slides to be presented at the TRB on the AR status and some additional slides given rationale on the different ARs

2. 18/01/2007 MetOp A - IASI FM2 : AR review 2 AR’s and NCR’s #Description CNES Status AR-6487 Non compliant IASI current consumption in decontamination mode No Show-stopper AR-6614IASI DPS medium-minor error (ZPD algorithm)No Show-stopper AR-6667CCM CSQ anomalyNo Show-stopper AR-6697Transient red low on IASI TM points ENS0028 and ENS0015Closed AR-6705DMC counter overflow (arithmetic error)No Show-stopper AR-6729OBDH area corruptionNo Show-stopper #Description CNES Status NCR-2077 SSVT4B : Unexpected initial configuration of IASI at start of test No Show-stopper NCR-2098 SSVT4B: CCE anomaly - RS422 dialogue error during the transition from H2 to AUX Closed NCR-2119SSVT4B: reversal of the thermistors designation in the databaseNo Show-stopper Extract from TRB

3. 18/01/2007 MetOp A - IASI FM2 : AR review 3 è Observation : On the LND 1470 parameter, it had been observed 10,5 Amps ripple @ 1Hz during IASI Decontamination @300K. è Analysis : Ô The relative behaviour of the LND1470 parameter and the ENP0007 is confirmed by ground test data Ô The ripple of the current on the EQPWR line is directly linked to the conjunction of the thermal control and decontamination heater lines activation @ 1Hz. Simulation and data from the EMC test campaign were provided. Ô The IASI powers calculated with the two telemetries are consistent. Ô This situation should not be faced again (future decontamination @200K, ripple around 7.6 Amps). Ô A waiver for the ripple on the IASI EQPWR line is available to cover this situation. AR-6487 : IASI Ripple in Decontamination @300K Extract from TRB

4. 18/01/2007 MetOp A - IASI FM2 : AR review 4 Power consumption

5. 18/01/2007 MetOp A - IASI FM2 : AR review 5 Power consumption

6. 18/01/2007 MetOp A - IASI FM2 : AR review 6 èThe power consumption determined with the in orbit HK is consistent with ÔThe optical vacuum results (IA-AR-1000-9858-AER) ÔThe IASI /METOP ICD (MO-IC-MMT-IA-0001, Issue 7) Power consumption

7. 18/01/2007 MetOp A - IASI FM2 : AR review 7 èThe heater lines of IASI are composed of : Ô14 ATC lines for the thermal control of the instrument Ô6 decontamination lines for the 300 and 200K decontamination of the radiator Ô5 deployment lines for the CD, CCFD and LFDs deployment èNote : ÔThe decontamination and deployments lines can not be switched on together ÔThe decontamination lines are activated in the “Heater 1 Decontamination” mode in conjunction with the ATC (Warm-Up targets) ÔThe deployment lines are activated individually (i.e. one by one) in the “Heater 1 deployment” mode in conjunction with the ATC (Warm-Up targets) ÔFor all the higher modes, the ATC lines are activated in conjunction with the equipment switch on, at operational targets. èThese lines are driven thanks to hardware automatons (one for the ATC, one for the Decontamination or Deployment activities) Thermal lines activation

8. 18/01/2007 MetOp A - IASI FM2 : AR review 8 An HW automaton drives sequentially the heater lines @ 1 Hz

9. 18/01/2007 MetOp A - IASI FM2 : AR review 9 An HW automaton drives sequentially the heater lines @ 1 Hz

10. 18/01/2007 MetOp A - IASI FM2 : AR review 10 ATC Thermal lines Impedance Decontamination Thermal lines Impedance “The linear summation of these individual contributors is impossible”

11. 18/01/2007 MetOp A - IASI FM2 : AR review 11 èIt is possible to establish the ripple on the EQPWR bus by injecting in the thermal simulation model the PWM and voltage acquired in the HK (4/11/06 09:37)

12. 18/01/2007 MetOp A - IASI FM2 : AR review 12 èEQPWR Ripples simulation data for the Heater 1Warm-Up & Heater 1 Decontamination are : ÔHeater 1 Warm-Up : 7.3 A ÔHeater 1 decontamination @300 K : 10.3 A ÔHeater 1 decontamination @200K : 7.6A èFor the higher modes, combination of the simulated ripple of the heater lines and ripple measured during AIT activities allow to establish the following table (ripple at frequency 1, 4.8 and 1/8 Hz): IASI Deviation Request (IA-DR-1000-1115-AER) is updated ÔTo integrate the ripple in decontamination mode (300K) ÔTo update the ripple value for other modes

13. 18/01/2007 MetOp A - IASI FM2 : AR review 13 è Observation : After the first transition into Normal Operation with the processing enable, the cumulative counter of the minor/medium B errors started to increase. This situation was also observed after the NZPD Patch uploading è Analysis : Ô The first increase of the counter is directly linked to the shape of the earth interferograms which did not allow the determination of the central position of the interferograms. This situation was foreseen by CNES and a “NZPD” Patch was uploading (19/12/2006). Ô The NZPD Patch was demonstrated to be efficient (good determination of the central fringe of the interferograms with good quality status). The END0051 became “quiet” during two days. Ô The second counter increase events are directly linked to invalid determination of the internal processing data due to some spikes on the interferogams, leading to a propagation of invalid determination of the consecutive product. Ô It has been proposed by CNES to set some internal processing thresholds in order to filter the raw input to the processing. AR-6614 : IASI DPS medium error (END0051) Extract from TRB

14. 18/01/2007 MetOp A - IASI FM2 : AR review 14 END0051 behaviour

15. 18/01/2007 MetOp A - IASI FM2 : AR review 15 IMS IIS MAS I/F Checks Spectra Processing Algorithms checks DMC errors management : - ELT entries - EC32/EC21 counters Image Interferograms OD DPS IMS errors management  EC32 (END0024  EC21 (END0023)  DPS_EC21_Sum (END0051)  DPS_ELT21_Status  ELT entries in Report format Complementary status Types of errors DPS corrective actionIMS Corrective action MajorTransition to Wait modeTransition to heater/refuse Medium ATransition to DPC suspend mode Transition to heater/refuse Medium B Spectra packets not processed, ELT Report in Auxiliary packets C.A depends of the type of errors : - DPS I/F errors - Algorithms errors Minor Spectra packets processed with invalid quality flags C.A depends of the type of errors : - DPS I/F errors - Algorithms errors DPS error detection Cf. IA-MU-1000-6870-AER v4.1 §1.2.2.2.7 & §1.2.2.7 The goal of this presentation is not describe all the causes of the END0051 incrementation ; it’s to explain the major contributors in the current behaviour of this HKTM point

16. 18/01/2007 MetOp A - IASI FM2 : AR review 16 è END0051 = Accumulation of END0023 (0  END0051  65 535) è END0023 = DPS medium B & minor “error” – elementary counter (0  END0023  255) ÔMulti-topics counter (Cf. IA-MU-1000-6870-AER v4.1 §1.2.2.7) è END0051 current contain : è The present END0051 behaviour is NOT an abnormal situation of the DPC processing; it represents a synthesis of the flags raised by the scientific algorithms Assumptions END0051 ZPD quality flag Spike quality flag Unsuccessful Research Index > Threshold Cold scenes Invalid Reduced spectra Cold scenes Invalid Reduced spectra Index > Threshold Spikes in Calibration interferogram Spikes in Calibration interferogram Flow-chart of the major contributors to incrementation of the END0051 counter

17. 18/01/2007 MetOp A - IASI FM2 : AR review 17 DPC software Initial inputs Internal variables Period ZPD algorithm Top parameters Reduced spectra (Cold Space) END0051 1 (Nb / hour) Atmospheric spectra Comments From : 29/11/2006 17:00 To :20/12/2006 18:00 DPC v1.10 No thresholds Valid  730 80 % OK  20% NOK  % flagged  ZPD algorithm : not efficient for “cold” scenes  Internal variables : valid END0051 due to the difficulty to determine the central fringe for “cold” scenes From : 20/12/2006 18:00 To :22/12/2006 15:00 DPC v2.00 No thresholds Valid  30  98% OK  2% NOK  % flagged  ZPD algorithm : efficient  Internal variables : valid END0051 due to the residual “cold” scenes not detected by the new algorithm From : 22/12/2006 15:00 To :24/12/2006 14:00 DPC v2.00 No thresholds P4 cd0 Inv  110 87% OK  13% NOK  % flagged  ZPD algorithm : efficient  Internal variables : invalid (spike 2 ) END0051 due to residual “cold” scenes and invalid reduced spectra From : 24/12/2006 14:00 To :27/12/2006 14:00 DPC v2.00 No thresholds P4 cd0 Inv P3 cd0 Inv  560 75% OK  25% NOK  % flagged  ZPD algorithm : efficient  Internal variables : invalid (spike 2 ) END0051 due to residual “cold” scenes and invalid reduced spectra From : 27/12/2006 14:00 To :30/12/2006 02:00 DPC v2.00 No thresholds P4 cd0 Inv P3 cd0 Inv  320 75% OK  25% NOK  % flagged  ZPD algorithm : efficient  Internal variables : modified & invalid (spike 2 ) END0051 due to residual “cold” scenes and invalid reduced spectra From : 30/12/2006 02:00 To :03/01/2007 12:00 DPC v2.00 No thresholds P4 cd0 Inv P3 cd0 Inv P4 cd1 Inv  720 67% OK  33% NOK  % flagged  ZPD algorithm : efficient  Internal variables : invalid (spike 2 ) END0051 due to residual “cold” scenes and invalid reduced spectra From : 03/01/2007 21:00 To :07/01/2007 00:00 DPC v2.00 No thresholds P4 cd0 Inv P3 cd0 Inv P4 cd1 Inv P1 cd0 Inv  860 50% OK  50% NOK  % flagged  ZPD algorithm : efficient  Internal variables : invalid (spike 2 ) END0051 due to residual “cold” scenes and invalid reduced spectra From : 15/01/2007 16:20 To :16/01/2007 11:00 DPC v2.00 Thresholds ZPD & Spikes Valid  900  98% OK Flag efficient  ZPD algorithm : efficient  Internal variables : valid END0051 due to residual “cold” scenes (ZPD threshold) and spikes (Spikes thresholds) 1 : Computed in Norm-Op / processing enable 2 : Calibration interferogram corrupted by a spike and not rejected because no threshold History of the DPC processing status No direct link

18. 18/01/2007 MetOp A - IASI FM2 : AR review 18 è Observation : The Flag Cube corner Speed Quality (CSQ) was detected to be in error three times during the SIOV activity. This flag is monitored by the IMS and reported into the report format (the anomaly counter is increased by one, red alarms). è Analysis : Ô This situation was already observed during ground tests and considered as acceptable since no effect on the products was noticed, and, that the event is very unlikely (refer to IASI NC-AO6298/001) Ô This situation could not lead to wrong internal processing data determination due to the monitoring on that data within the processing. Ô This situation could not lead to a refuse mode transition since this is a unlikely event (i.e. with no consecutive occurrence). AR-6667 : CCM CSQ Anomaly Extract from TRB

19. 18/01/2007 MetOp A - IASI FM2 : AR review 19 èCSQ anomaly during routine operation : potential possibilities 1.Use as is, i.e. from time to time the anomaly counter will increase by one, report format will be acquired, and the signature of the anomaly shall be checked in order to confirm the CSQ reporting. It is reminded that there is no mode transition associated to that on-board monitoring if this anomaly is not consecutive. 2.To modify the DPS_ELT21_Status parameter in order to disable the monitoring of the CSQ_NV flag by the on-board software (with the subsystem parameter MCMD) Note : it could also be possible to modify the ground monitoring status (red vs yellow) for the anomaly counter in order to minimize the impact of that type of anomaly on the operators. For example : èthe anomaly counter shall be an yellow limit when different from 0 èThe refuse mode bit shall be a red limit when the associated mode is standby and an yellow limit if the mode is heater. AR-6667 : CCM CSQ Anomaly

20. 18/01/2007 MetOp A - IASI FM2 : AR review 20 èAnomaly : HK TM point transiently in red in External Calibration èObservation : SCAN position out of range in External Calibration ENS0028 (detail)  ENS0015 (global) in Red using the ground monitorings v08 èAnalysis : The ground monitorings v08 corresponding the ENS0028 & ENS0015 are wrong in External Calibration èStatus : ÔThe ground monitorings v09 allows to correct the wrong thresholds for these 2 parameters ÔAlready implemented (before Xmas period) AR-6697 : Transient red low on IASI TM points ENS0028 and ENS0015 Extract from TRB

21. 18/01/2007 MetOp A - IASI FM2 : AR review 21 è Observation : Due to the overflow of one of the DMC counter, the DPS automatically performed a transition to WAIT mode (with DPC suspended). This event triggered a Heater Refuse mode transition since the DPS mode is no more consistent with the Normal Operation mode. è Analysis (SAAB Tec note : P-IASI-NOT-00074-SE) : Ô The counter counts the number of the clock ticks since the first switch-on of the equipment Ô When reaching the value 0x80000000, an ALU fixed point arithmetic overflow flag is raised Ô This interruption is considered as a major anomaly by the DMC SW and leads to the DPS mode transition Ô Dumps performed on the equipment and simulation performed by SAAB on DMC breadboard confirmed that analysis Ô Patch was delivered and successfully applied Ô This event was observed during the night of 1st January with the expected behaviour (entry in the Report format, no refuse mode transition). Ô This event will happen periodically (every each 24 days and 20 hours) AR-6705 : DMC counter overflow (arithmetic error) Extract from TRB

22. 18/01/2007 MetOp A - IASI FM2 : AR review 22 èIt is proposed to extend the period of observation of this anomaly during a certain period to demonstrate the repeatability period and that the patch definitively fix the problem. è DMC counter overflow anomaly during routine operation : potential possibilities 1.Use as is, i.e. from time to time the anomaly counter will increase by one, report format will be acquired, and the signature of the anomaly shall be checked in order to confirm the overflow reporting. It is reminded that there is no mode transition associated to that on-board monitoring if this anomaly is not consecutive. 2.To modify the DPS_ELT21_Status parameter in order to disable the monitoring of the overflow flag by the on-board software (with the subsystem parameter MCMD) Note 1 : It was also possible to mask this interrupt directly in the DMC SW, in that case no error reporting is performed. This solution was not selected by CNES. Note 2 : it could also be possible to modify the ground monitoring status (red vs yellow) for the anomaly counter in order to minimize the impact of that type of anomaly on the operators. For example : èthe anomaly counter shall be an yellow limit when different from 0 èThe refuse mode bit shall be a red limit when the associated mode is standby and an yellow limit if the mode is heater. AR-6705 : DMC counter overflow (arithmetic error)

23. 18/01/2007 MetOp A - IASI FM2 : AR review 23 èAnomaly : OBDH Area corrupted by SEU èObservation : Increase of the EDAC simple error counter (ENA0021), +2 every 16 seconds èAnalysis : EDAC detects the SEU, but the SW does not correct the corrupted word in this RAM memory area (limited to 240 words, @0x40220 to @0x4030F). èWorkaround : ÔCreate an MCMD (named “Reset ODBH”) which will overwrite the data in that location ÙDescription : ÝEOA024 : Transition program åLength : 240 words åProcedure ID : 40 (TBC) åFilled with : 117 “NOP” instructions (0x8000 0x0000) ÔCreate a procedure allowing to execute systematically (at the end of each SVL visibility), thanks to the mission queue, the “Reset OBDH” 1.The idea is to systematically perform this workaround independently of the SEU Error detection in that area 2.The maximum time when the instrument could be subject to that anomaly will be limited to one orbit AR-6729 : OBDH area corruption Extract from TRB

24. 18/01/2007 MetOp A - IASI FM2 : AR review 24 AR’s and NCR’s CNES considers that AR’s and NCR’s could be proposed to closure and there is no technical point which prevents to start the Cal/Val Phase Extract from TRB