Jason-CS

Jason-CS (Jason Continuity of Service) is the second component of the hybrid solution (Jason-3 + Jason-CS) agreed in 2009. Jason-CS will ensure continuity with Jason-3 with a first launch by end of 2017 to guarantee adequate overlap with Jason-3. At least two satellites with a 7 years lifetime each (5 years + 2 years consumables) are planned to give time before new technologies such as swath interferometry (SWOT mission) can be considered as operational.

Jason-CS, as the reference mission of the OST constellation, should ensure the same (or better) level of performance as earlier Jason series. It will be a continuation of existing partnership between the U.S. and Europe (Noaa, Nasa, Eumetsat, Esa, Cnes and industry). The detailed sharing of responsibilities has not yet been defined. Cnes should contribute with its expertise in instruments (altimeter, radiometer, Doris) and in related processing (altimeter measurements, precise orbit determination...) so as to guarantee the high level of accuracy required to achieve the mission.

As recommended by OSTST, the orbit should remain the same, i.e. the traditional T/P-Jason orbit -non-sun-synchronous, 1336 km, 66° inclination.

Jason-CS will use a new satellite bus based on CryoSat, with a capability to mitigate orbital debris (de-orbiting within 25 years required), a new altimeter based on CryoSat and Sentinel, taking advantage of recent developments and new modes compared to Jason-3 (SAR, interleaved mode TBC).

Next milestones : Design Consolidation Review (November 2011-January 2012), phase B1 study underway, extended to end 2012, approval for implementation of Esa programme planned for end-2012, approval for partner agencies expected during 2013 and 2014.