7 Guit MissionOps

Mission Operations Status August 7, 2006: 

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 EOS Aqua

Topics: 

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

Aqua Spacecraft Subsystems: 

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 All subsystems configured to primary hardware

Slide4: 

Spacecraft Subsystem Status Summary

Major Activities & Anomalies (Since Aug 2005): 

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

Planned Activities: 

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

Aqua Inclination Adjust: 

Aqua Inclination Adjust

Inclination Adjust Maneuvers (Aug/Sep/Oct 2006) : 

Inclination Adjust Maneuvers (Aug/Sep/Oct 2006)

Slide9: 

Maneuver Locations

Long-Term Plans: 

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

Spacecraft Anomalies: 

Spacecraft Anomalies

Spacecraft Anomalies: 

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

Spacecraft Anomalies: 

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

Old Spacecraft Anomalies: 

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

Data Losses(Since August 2005): 

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

Data Losses(Continued): 

Data Losses (Continued) November 8, 2005: ~ 3m 4s of Hi-Rate Science FOT Data Loss due to failed ground station contact MODIS: 312/17:45:03-17:48:07 AIRS: 312/17:45:05-17:48:09 November 8, 2005: ~ 17m 30s of Hi-Rate Science During recovery from the failed ground station contact, the FOT misplaced a tic (‘) mark in contingency PROC, which resulted in a significant delay in the execution. This Ops Error resulted in an additional 17 minutes and 30 seconds of Hi-Rate Science data loss MODIS: 312/18:59:32-19:17:00 AIRS: 312/18:59:33-19:17:02

Data Losses(Continued): 

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

Data Losses(Continued): 

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

Slide19: 

Aqua Data Capture (Thru June 30, 2006)

Instrument Anomalies(NO NEW ANOMALIES): 

Instrument Anomalies (NO NEW ANOMALIES)

Old Instrument Anomalies: 

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

Propellant Usage & Lifetime Estimate: 

Propellant Usage & Lifetime Estimate

Slide23: 

Propellant Usage Orbit Raise Maneuvers Orbit Inclination Maneuvers Orbit Inclination Maneuver Tests

Slide24: 

Lifetime Estimate Worst case analysis for Aqua would indicate minimum of 8-10 years of remaining life – saving 125kg of fuel for EOM ESMO Flight Dynamics analysis indicates Aqua has sufficient propellant reserves to last until 2015

Slide25: 

Lifetime Estimate

Slide26: 

Long-Term Solar Flux Predicts

Summary: 

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