Doris-equipped satellites

The Doris system has been a great technical, operational and scientific success. The Doris instrument, which is already flying on a number of satellites and is being considered for several new missions, guarantees users a high-quality operational service providing precise orbit determination over the long term. With more satellites carrying the Doris instrument, the system will make more accurate than before.

Current on-orbit constellation

Currently seven Doris contributor satellites are in flight, and their measurements are available at the IDS data centers.

  • OSTM/Jason-2 (Cnes/Nasa/Eumetsat/Noaa) - The Topex/Poseidon and Jason-1 follow-on ocean observation mission was launched on June 2008. Jason-2 takes on board the new DGXX Doris receiver (7-channels: beacons simultaneous tracking capability has been raised up to seven beacons, USO new generation allowing a better frequency stability while crossing SAA, a better quality of MOE and Jason-2 useful for beacons location), and LRA and GPS as tracking systems. Further information on OSTM/Jason-2.
  • Cryosat-2 (ESA) was launched in April 2010 with on board a Doris DGXX Receiver + LRA, (3.5 years as nominal lifetime). Further information on Esa website.
  • HY-2A (China Academy of Space), launched in August 2011 with on board a Doris DGXX + LRA + GPS (nominal life time of 3 years). Further information on M.Dejus (2012) presentation, Doris on HY-2A (pdf) at IDS worshop Venice, and on HY-2A mission.
  • Saral (Cnes/Isro cooperation), launched on 2013/02/25, , with a Doris DGXX + (nominal lifetime of 5 years). Further information on Saral.
  • Jason-3, launched on January 2016. Main changes from the previous Doris instrument are detailed here.
  • Sentinel-3A, launched on February 2016. Further information on this mission.
  • Sentinel-3B, launched on April 2018. Further information on this mission.
Satellites Doris receiver generation Doris redundancy Other tracking system Cospar # Doris instrument end
Spot 2 1G No - 9000501 30-Jun.-2009


1G Yes SLR+GPS 9205201 1-Nov-2004
Spot 3 1G No - 9306101 9-Nov-1996
Spot 4 1G No - 9801701 11-01-2013
Jason-1 2GM Yes SLR+GPS 0105501 01-07-2013
Envisat 2G Yes SLR 0200901 8-April-2012
Spot 5 2GM No - 0202101 11-Dec-2015
STPSat-1 CITRIS - GPS 0700604 07-Oct-2009
Jason-2 DGXX Yes SLR+GPS 0803201
Cryosat-2 DGXX Yes SLR 100131
HY-2A DGXX Yes SLR+GPS 110431
Saral DGXX
Jason-3 DGXX-S Yes SLR+GPS 1600201
Sentinel-3A DGXX-S Yes SLR+GPS 1601101
Sentinel-3B DGXX-S Yes SLR+GPS 1803901

Confirmed future Doris missions

The future Doris missions are numerous and should guarantee a constellation with at least three Doris contributor satellites through 2030:

  • Sentinel-3C (Copernicus- ESA/Eumetsat/CNES) is planned for 2020 (Doris DGXX-S with mini USO + LRA + GPS) (nominal lifetime of 7 years). Then Sentinel 3D is planned for 2025. Further information on Esa website.
  • HY-2C & HY-2D (CNSA/NSOAS) with Doris DGXX-S + LRA + GPS are planned for Oct. 2019 and Oct. 2020
  • Jason-CS1&2/Sentinel-6A, 6B (Copernicus- ESA/Eumetsat/EU/Cnes/Noaa/Nasa) (end 2020, 2025) with DGXX-S, LRA, GPS.
  • Swot (Surface Water Ocean Topography)  Mission is foreseen for 2021 (DGXX-S + GPS + LRA).  Further information on Swot website or on Aviso website. 

Proposed future missions or missions awaiting approval

  • HY2 E-F-G-H. Further information on HY-2.

Further information:

  • C. Manfrédi (2018), Doris system status and future Missions (pdf), presentation IDS workshop 2018, Ponta Delgada, Azores Archipelago, Portugal