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Aqua Mission Operations Status. 6/9/2012. Topics. Spacecraft Performance SummaryMajor Activities Completed (since Aug 05)Planned ActivitiesAnomalies (since Aug 05)Propellant Usage
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1. Mission Operations Status August 7, 2006
Bill Guit
Aqua/Aura Mission Director - Code 581
phone 301-614-5188
fax 301-614-5267
William.J.Guit@nasa.gov
2. Aqua Mission Operations Status 6/10/2012 Topics Spacecraft Performance Summary
Major Activities Completed (since Aug 05)
Planned Activities
Anomalies (since Aug 05)
Propellant Usage & Lifetime Estimates
Overall Summary
Additional Slides:
Maneuvers and Ground Track Error
Back-Up: Anomaly Slides (BMA-2 Cell 4 & SSR)
Back-Up: Aqua Project EOL Disposal Options
3. Aqua Mission Operations Status 6/10/2012 Aqua Spacecraft Subsystems Command & Data Handling (CDH) – Nominal
Solid State Recorder (SSR) – holds 2 orbits of data
Minor SSR Performance Anomaly (April 10, 2006)
Communications (COMM) - Nominal
Electrical Power System (EPS) – Nominal
ARE 4A continues to perform at lower level
Battery Cell Anomaly (September 2, 2005)
Flight Software (FSW) - Nominal
Guidance, Navigation & Control (GN&C) - Nominal
Propulsion (PROP) - Nominal
Thermal Control System (TCS) – Nominal
4. Aqua Mission Operations Status 6/10/2012
5. Aqua Mission Operations Status 6/10/2012 Major Activities & Anomalies (Since Aug 2005) Aug 23rd – HQ Briefing
Sep 2nd – Battery Cell 4 Anomaly
Dec 1st – Drag Make-Up Maneuver (DMUM) #24
Waived off due to Orbital Debris concerns
Dec 31st – Leap Second
Apr 14th – Expanded Direct Broadcast
Apr 28th – CloudSat (CS) & CALIPSO (CP) Launched
May 27th & 31st – CS & CP Orbit Raising Complete
May 4th – 4-Year Anniversary
May 18th – Loaded Special AIRS Stored Command Sequences (SCSs) for DMUM Waive Offs
Jun 7th – Norway Communications Outage
Jul 5th – Norway Communication Outage
6. Aqua Mission Operations Status 6/10/2012 Planned Activities Inclination Adjust Maneuvers (IAMs)
August 22nd & 29th
September 7th, 12th, 19th & 26th
October 3rd (Back-Up Date)
Coordinated A-Train IAM Plan Developed
Sep 22nd – EPS State-of-Health Test #5 (@Equinox)
Oct 20th – Solar Eclipse #10
Dec 31st – Leap Second (NONE Planned for 2006)
TBD – HSB Turn-On Test #14
TBD – EEPROM Refresh
7. Aqua Inclination Adjust
8. Aqua Mission Operations Status 6/10/2012 Inclination Adjust Maneuvers (Aug/Sep/Oct 2006)
9. Aqua Mission Operations Status 6/10/2012
10. Aqua Mission Operations Status 6/10/2012 Long-Term Plans Aqua/Aura “Single-S/C-Ops”
Goal is to operate Aqua and Aura as if they were a single spacecraft and reduce staff where feasible
Take advantage of spacecraft similarities
Aqua/Aura Auto Ops (“Dump-N-Go”)
Goal is to provide a capability to retrieve Science Data in the event of a major communication outage
Eliminates the need for ground commanding for normal SSR operations
Science Team concerns over data losses due to Auto Ops
Aqua/Aura Automation (“Lights-Dim” Ops)
Goal is one person staffing during off-shift operations with “fire-watch” approach to anomalies and data losses
11. Spacecraft Anomalies
12. Aqua Mission Operations Status 6/10/2012 Spacecraft Anomalies Battery Anomaly – September 2, 2005
BMA-2 Cell 4 temperature exceeded its 10o C yellow high limit and charge/discharge voltage profile was also anomalous
Charge/discharge cycle subsequently returned to normal
Successfully implemented recommended charge profile changes (also implemented on EOS Aura)
Final Closeout Report released in March 2006
Most likely cause a variable, intermittent, unpredictable short
Root cause of shorting cannot be conclusively determined
Open action items being followed by EPS Working Group
Destructive Physical Analysis (DPA) Report released May 1st
Results of the DPAs did not produce any new recommendations for the flight operations of the Aqua or Aura spacecraft
No impact to operations or 6-year life expectancy
13. Aqua Mission Operations Status 6/10/2012 Spacecraft Anomalies Solid State Recorder (SSR) Anomaly – April 10, 2006:
Noticeable increase in the single bit error (SBE) rate detected by the SSR Error Detection and Correction (EDAC) was observed
Previous increases had been correlated with solar activity
Occurs approximately every other orbit
Nominal 5-20 SBEs per dump jumped to 100-170 per dump
Not near EDAC threshold of 680 counts
No increase in double bit errors
Flight Operations Team (FOT) continues to monitor by performing more frequent diagnostic dumps
Sub-module #205 responsible for the increase
No impact to science data collection
14. Aqua Mission Operations Status 6/10/2012 Old Spacecraft Anomalies SADA Potentiometer – OPEN
Noise observed on both POTs – First observed in 2003
Anticipate Aqua FSW modification(s) will be required
Noise exceeded FM threshold 7 times on 10/10/04
FOT continues to monitor performance
No current impact to operations
ARE-4A Anomaly – OPEN
First observed on 8/13/04, then again on 9/9/04 and 10/8/04
FOT generated Anomaly Report in December 2004
Discussed at each Power Systems Review
FOT continues to monitor performance
No current impact to operations
15. Aqua Mission Operations Status 6/10/2012 Data Losses(Since August 2005) October 18, 2005: ~ 1h 4m 57s of Hi-Rate Science
Combination of EDOS problem with multiple operator errors on the part of the FOT
Resulted in High Rate Science Data Losses:
MODIS: 291/09:43:01 – 10:47:58 (1h 4m 57s )
AIRS: 291/09:43:03 – 10:47:59 (1h 4m 56s )
Operations teams (EDOS & FOT) conducted a root cause and corrective action analysis
Improvements in communications between EDOS and the FOT and procedural changes have been implemented
Should prevent a reoccurrence
16. Aqua Mission Operations Status 6/10/2012 Data Losses(Continued)
17. Aqua Mission Operations Status 6/10/2012 Data Losses(Continued) March 28, 2006: ~ 11s of Hi-Rate Science
Ground station antenna problem caused loss of command and telemetry
Allowed Partition 9 (high-rate science) to overwrite data before the next playback
FOT jammed the Partition 9 Read Pointer on the next contact to minimize the data loss
Data Loss Times:
MODIS 2006-087/16:28:06 – 16:28:17z
AIRS 2006-087/16:28:08 – 16:28:18z
18. Aqua Mission Operations Status 6/10/2012 Data Losses(Continued) June 7, 2006 – Norway Communications Outage
Service provider disrupted service on the redundant circuit while trouble-shooting a problem on the prime circuit
Instrument Science Data Losses: (3h 39m 24s)
MODIS 158/03:45:53 – 07:25:15 GMT
AIRS 158/03:45:54 – 07:25:17 GMT
July 5, 2006 – Norway Communications Outage
Router in New York down at unmanned site
Instrument Science Data Losses: (6h 43m 26s)
MODIS 186/00:56:28 – 07:22:32 GMT
AIRS 186/00:56:28 – 07:22:32 GMT
MODIS 186/08:38:23 – 08:55:45 GMT
AIRS 186/08:38:28 – 08:55:45 GMT
All Previous Data Losses Totaled 5h 2m 58s
19. Aqua Mission Operations Status 6/10/2012
20. Instrument Anomalies(NO NEW ANOMALIES)
21. Aqua Mission Operations Status 6/10/2012 CERES-Fore (FM4) Short-wave Anomaly - March 2005
March 30th at 089/18:42 GMT the Short-wave channel bridge balance electronics failed to update the bridge settings as the space lamp value fell outside the established window of 50-200 counts
No impact to Ops – Loss of Redundancy
AMSU A1-2 Noisy Bus Current Rise - May 2005
ART concluded that the observed increase in scan motor current was indicative of normal wear and didn’t warrant further investigation at this time – Review every 6-Months
Observed increase as expected in May 2006
MODIS SpectroRadiometric Calibration Assembly (SRCA) Lamp #3 Anomaly – May 2005
Modification to Ops completed Fall 2005
Final Anomaly Closeout Report completed Dec 2005 Old Instrument Anomalies
22. Propellant Usage & Lifetime Estimate
23. Aqua Mission Operations Status 6/10/2012
24. Aqua Mission Operations Status 6/10/2012
25. Aqua Mission Operations Status 6/10/2012
26. Aqua Mission Operations Status 6/10/2012
27. Aqua Mission Operations Status 6/10/2012 Summary Spacecraft Status - GREEN
Instrument Status - GREEN
AMSR-E, AIRS, AMSU, CERES & MODIS:
Operations Nominal – Producing Great Science
HSB: Survival Mode since 2/5/2003
Data Capture/L0 Processing Status – GREEN
SSR Data Capture to 07/31/2005: 99.989391 %
SSR Data Capture to 06/30/2006: 99.547602
SSR Data Capture to 07/31/2006: TBD
Data Latency – Excellent
Ground Systems – Performing well and are meeting and/or exceeding requirements