JASON 2 Satellite
Mini-satellite from CNES PROTEUS series
Instruments: one altimeter, one radiometer, DORIS, GPS, one laser reflector for precise orbitography, and three passengers: T2L2, CARMEN-2, LPT.
Measurement of ocean surface topography, surface wind speed, wave height.
High inclination orbit at 1336 km altitude
Mission lifetime 5 years

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Jason-2: altimetry missions follow-on
for ocean observation


The JASON-2 project is a response to the international demand for programmes to study and observe oceans and the climate, through a worldwide ocean observation system. It is a continuation to the TOPEX/POSEIDON and JASON-1 altimetry missions developed by CNES and NASA. Altimetry, i.e. the precise measurement of ocean surface topography, has indeed become since 1992 (launch of TOPEX/POSEIDON) an essential tool for the study of oceans on a global scale.

JASON-2 is part of cooperation between CNES, EUMETSAT, NASA and NOAA. Space and ground segments of the Jason-2 mission strongly inherit from the JASON-1 mission.

Onboard the JASON-2 satellite, which uses a PROTEUS platform, the payload is composed of a Poseidon-3 radar altimeter supplied by CNES, an Advanced Microwave Radiometer (AMR) supplied by NASA/JPL, and a triple system for precise orbit determination: the DORIS instrument (CNES), GPS receiver and a Laser Retroflector Array (LRA) (NASA). Three further onboard instruments (T2L2, LPT, CARMEN-2) are also included.

In order to ensure continuity and optimal inter-calibration of observations over the long term, JASON-2 flies the same orbit as JASON-1 and TOPEX/POSEIDON. Moreover, data processing are integrated into the CNES ground segment "SALP" (altimetry and precise positioning system), which already operates the altimetry missions TOPEX/POSEIDON, JASON-1, ENVISAT, GFO, whose data is distributed on the AVISO+ website.

Latest update 26/09/2014
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18-20 October 2010
Ocean Surface Topography Science Team (OSTST) meeting in Lisbon, Portugal
12 March 2010
A Jason-3 satellite to replace Jason-1 in 2013
5 August 2009
The Jason-2/OSTM GDRs are now available to the public
22-24 June 2009
Ocean Surface Topography Science Team (OSTST) meeting in Seattle, USA
15 May 2009
A new DEM was successfully uploaded on OSTM/Jason-2
2 March 2009
First results for Jason-1/Jason-2 tandem
26 January 2009
End of the Jason-1/Jason-2 tandem phase: Jason-1 orbit change to an interleaved ground track
16 January 2009
Dissemination of IGDR products to all users by CNES via AVISO website
15 December 2008
Dissemination of OGDR products to all users, by EUMETSAT and NOAA operational centers