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Lessons Learned: Gravity Probe B Data Analysis October 15, 2005 Sasha Buchman

Lessons Learned: Gravity Probe B Data Analysis October 15, 2005 Sasha Buchman. The Relativity Mission Concept. Launched April 20, 2004 Start Science August 27, 2004 Liquid He exhausted September 29, 2005. UNDERSTAND THE INSTRUMENT. “ New Instrument ” In Space Noise Sensitivities.

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Lessons Learned: Gravity Probe B Data Analysis October 15, 2005 Sasha Buchman

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  1. Lessons Learned: Gravity Probe B Data Analysis October 15, 2005 Sasha Buchman

  2. The Relativity Mission Concept Launched April 20, 2004 Start Science August 27, 2004 Liquid He exhausted September 29, 2005

  3. UNDERSTAND THE INSTRUMENT • “New Instrument” In Space • Noise • Sensitivities

  4. The Instruments: GPB and LISA 13 mHz0.1 mHz-1 Hz •4 Gyroscopes •6 GRS •1 Telescope •6 Telescopes •1 Spacecraft •3 Spacecraft •Thermally Controlled •Thermally Controlled • 4 SQUIDs •3 Interferometers •9 DOF Control •57 DOF Control

  5. The Data: GPB and LISA 13 mHz0.1 mHz-1 Hz •2 kbytes/sec TDRSS @ 2-12 hours/day DSN •32 kbytes/sec direct ground @ 4/day •~ 700 sensors •~ 10,000 monitors •Regular data: 0.1-1 Hz •Snapshots: 220-2200 Hz • >100,000 commands •~ 1 Terabytes/year recorded

  6. Recommendations •Extensive ground simulator with hardware in the loop •Full instrumentation of all systems • Comprehensive periodical instrument calibrations •Maximum instrumentation data to ground •Fast data snapshots to ground • Critical data processing on the ground • Maximum ‘instrument time’ allocation in Data Analysis

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