Mission Operations Status August 7, 2006

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Mission Operations Status August 7, 2006
EOS Aqua

• Bill Guit
• Aqua/Aura Mission Director - Code 581
• phone [phone]
• fax [phone]
• William.J.Guit_at_nasa.gov

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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

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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 (GNC) - Nominal
• Propulsion (PROP) - Nominal
• Thermal Control System (TCS) Nominal

All subsystems configured to primary hardware
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Spacecraft Subsystem Status Summary
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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

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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 (_at_Equinox)
• Oct 20th Solar Eclipse 10
• Dec 31st Leap Second (NONE Planned for 2006)
• TBD HSB Turn-On Test 14
• TBD EEPROM Refresh

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

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Maneuver Locations
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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

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Spacecraft Anomalies
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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

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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

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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

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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 291/094301 104758 (1h 4m 57s )
• AIRS 291/094303 104759 (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

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Data Losses(Continued)

• November 8, 2005 3m 4s of Hi-Rate Science
• FOT Data Loss due to failed ground station
  contact
• MODIS 312/174503-174807
• AIRS 312/174505-174809
• 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 312/185932-191700
• AIRS 312/185933-191702

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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 2006-087/162806 162817z
• AIRS 2006-087/162808 162818z

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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 158/034553 072515 GMT
• AIRS 158/034554 072517 GMT
• July 5, 2006 Norway Communications Outage
• Router in New York down at unmanned site
• Instrument Science Data Losses (6h 43m 26s)
• MODIS 186/005628 072232 GMT
• AIRS 186/005628 072232 GMT
• MODIS 186/083823 085545 GMT
• AIRS 186/083828 085545 GMT
• All Previous Data Losses Totaled 5h 2m 58s

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Aqua Data Capture(Thru June 30, 2006)
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Instrument Anomalies(NO NEW ANOMALIES)
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Old Instrument Anomalies

• CERES-Fore (FM4) Short-wave Anomaly - March 2005
• March 30th at 089/1842 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
  didnt 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

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Propellant Usage Lifetime Estimate
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Propellant Usage
Orbit Raise Maneuvers
Orbit Inclination Maneuvers
Orbit Inclination Maneuver Tests
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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
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Lifetime Estimate
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Long-Term Solar Flux Predicts
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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