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JASON-1 MISSION STATUS

JASON-1 MISSION STATUS. S. Coutin-Faye CNES, Altimetry and Precise Positioning Office. JASON-1 MISSION STATUS. MAJOR EVENTS SINCE LAST OSTST (March 16-18, 2006 Venice). Project Milestones:

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JASON-1 MISSION STATUS

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  1. JASON-1 MISSION STATUS S. Coutin-Faye CNES, Altimetry and Precise Positioning Office

  2. JASON-1 MISSION STATUS MAJOR EVENTS SINCE LAST OSTST(March 16-18, 2006 Venice) • Project Milestones: • Exploitation Review held on March 22, 2006 in Toulouse Space Center: successful : only one major recommendation dealing with station keeping maneuvers • Satellite major events : • 1 Safe Hold Mode due to a Mass Memory double error: fully explained and repaired • Instruments : • No major event Jason-1 status- OSTST - Hobart - March, 2007

  3. JASON-1 MISSION STATUS Jason-1 Data Availability • Data availability since last SWT :OK • Requirement =95% of all possible over-ocean data • Payload telemetry data losses due to : • bus 4.89% (1SHM) • altimeter 0.1% (2 incidents) • Doris 0.00% • JMR 0.00% • Satellite (total) :~ 4.99% • ground system: ~ 0.05% (data loss at earth terminal level) • Total Availability ~ 94.96% since last SWT at OSDR/IGDR and GDR level Jason-1 status- OSTST - Hobart - March, 2007

  4. JASON-1 MISSION STATUS Platform incident synthesis since last SWT (March, 2006) Jason-1 status- OSTST - Hobart - March, 2007

  5. JASON-1 MISSION STATUS Satellite status The Jason-1 satellite works well. Margins in propellant are sufficient to ensure a 10 years mission duration -> Specific activities performed to monitor critical subsystems: • STR • stabilized since December 2002 • new calibration table uploaded on STR2 & STR1 => decreasing of the STR noise. Betterestimates of gyros errors: status OK • Reaction wheel • Satellite operations conducted using the 3 wheel attitude: status OK • Tranceiver • Satellite operations conducted using the Tx on PMA: status OK • SADM • SADM spike are continuously monitored (detected by yellow ground alarm): status OK • There is NO short term risk and NO functional impact through the preventive actions performed (gain decreasing, FDR inhibition) Jason-1 status- OSTST - Hobart - March, 2007

  6. Station keeping maneuver: one every 2 months 2006/04/20 with a = 8.4 m 2006/06/29 with a = 6.66 m 2006/09/26 with a = 8.11 m 2006/12/14 with a = 6.36 m 2007/01/23 with a = 7.23 m 2007/02/22 with a = - 1.9 m Cross maneuver: On request None from last SWT Gyro calibration No more due to 3 reaction wheel configuration JASON-1 MISSION STATUS Maneuver synthesis Jason-1 status- OSTST - Hobart - March, 2007

  7. JASON-1 MISSION STATUS Equatorial Nodal Crossing • requirement = +- 1 km from reference nodes (yellow zone) • After the SL went out of its ground track windowson Feb. 2006due to bad efficiency of braking maneuverand, • According to the 2006 REVEX recommendation, expertise has been performed to better take into account efficiency uncertainty: no more excursion outside the +/- 1km window NB:curves are for Ascending and Descending nodes and green squares are maneuvers Jason-1 status- OSTST - Hobart - March, 2007

  8. JASON-1 MISSION STATUS Payload incident synthesis since last SWT (March, 2006) Jason-1 status- OSTST - Hobart - March, 2007

  9. JASON-1 MISSION STATUS DORIS and Poseidon specific operations DORIS • None • no change of configuration since last SWT POSEIDON • Specific operations limited to Restart when incident detected • no change of configuration since last SWT, March 2006 -> CNES payload: status OK (see JPL presentation for NASA detailed payload status) Jason-1 status- OSTST - Hobart - March, 2007

  10. JASON-1 MISSION STATUS Jason Ground System (Routine) CNES Earth Terminal : - Aussaguel CNESET-AUS NASA Earth Terminals : - Poker Flat NASAET-PFF - Wallops (back up) NASAET-WFF PFF AUS JPL Control Center JTCCS (Pasadena) CNES Control Center JCCC (Toulouse) WFF CNES Mission Center SSALTO (Toulouse) JPL Mission Center JSDS (Pasadena) USERS Jason-1 status- OSTST - Hobart - March, 2007

  11. JASON-1 MISSION STATUS CNES/JPL Operations Status • Very good behavior for both Control Centers • Payload TM gaps due to 1 SHM since last SWT (Nov. 2006) & Poseidon incidents • Ground system : ROBUST • Operations Status: GREEN • All the JGS elements are performing well • All documentation and ops team training is complete and up to date • 1 SHM recovery successfully performed. • CNES/JPL operational coordination is well understood and working smoothly. Jason-1 status- OSTST - Hobart - March, 2007

  12. JASON-1 MISSION STATUS CONCLUSION • Jason-1 mission, satellite and ground system: current status is very good • Within the CNES Altimetry Service (SALP): Jason-1 considered to be highest priority for continued operations • Extension agreement for 5 more years of operation signed between CNES & NASA on december, 2006 Jason-1 status- OSTST - Hobart - March, 2007

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