JASON-1 MISSION STATUS

JASON-1 MISSION STATUSJASON-1 MISSION STATUS

S. Coutin-Faye

CNES, Altimetry and Precise Positioning Office

Jason-1 status- OSTST - Hobart - March, 2007 2

MAJOR EVENTS SINCE LAST OSTSTMAJOR EVENTS SINCE LAST OSTST(March 16-18, 2006 Venice)(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 Data AvailabilityJason-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



Platform incident synthesis since last SWT (March, 2006)Platform incident synthesis since last SWT (March, 2006)

Incident Date Cause Mission impact

SHM 2006/10/30 19h58 Mass Memory EDAC error => MM investigations and modules reconfiguration before SHM recovery

NO mission for 428h02mn



Satellite statusSatellite 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. Better estimates 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)



Maneuver synthesisManeuver synthesis

■ 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



Equatorial Nodal CrossingEquatorial Nodal Crossing

requirement = +- 1 km from reference nodes (yellow zone)

After the SL went out of its ground track windows on Feb. 2006 due 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



Payload incident synthesis since last SWT (March, 2006)Payload incident synthesis since last SWT (March, 2006)

Incident Date Cause Mission impact POSEIDON reinit

2006/09/19 05h49 2006/12/14 12h21

Loss of altimeter measurements: 2006/09/19 4h16:7h51 2006/12/14 9h58:15h38

TRSR 2006/07/18 DC to DC convertor suspected (thermal & radiation effect)

Numerous standby transition. Since October, 20th the TRSR2 is set ON 12h per day with 4 satellites in tracking

Total unavailability = 9h15mn Poseidon-2 availability = 99,9%



DORIS and Poseidon specific operationsDORIS 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 Ground System (Routine)Jason Ground System (Routine)CNES Earth Terminal :- Aussaguel CNESET-AUS

CNES Control CenterJCCC (Toulouse)

CNES Mission CenterSSALTO (Toulouse)

JPL Control CenterJTCCS (Pasadena)

JPL Mission CenterJSDS (Pasadena)

NASA Earth Terminals :- Poker Flat NASAET-PFF- Wallops (back up) NASAET-WFF

AUS

PFF

WFF

USERS



CNES/JPL Operations StatusCNES/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.




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 MISSION STATUS

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