https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.9 2026-05-13T10:52:13.516Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/9bfd9ff7-b838-4834-bd47-0127384c79f7 DORIS Date=2019-03-26 User Id=sritz Entity=WeightedRelation Operation=UPDATE Field=relationshipValue System Note=update WeightedRelation Old Value=null New Value=1 Date=2019-03-26 User Id=sritz Entity=WeightedRelation Operation=UPDATE Field=relationshipType System Note=update WeightedRelation Old Value=null New Value=Platform-Instrument Date=2019-02-22 User Id=mmorahan Entity=Resource Operation=UPDATE Field=type System Note=update Resource Old Value=IMAGE New Value=image Date=2019-03-26 User Id=sritz Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 41163801-6aac-43e5-aed7-9f52613a6a73 relationship type: null relationship value: null generated by: null Date=2019-02-22 User Id=mmorahan Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 5449d87b-5573-450f-8acb-2fdfeab3c8ce relationship type: null relationship value: null generated by: null Date=2026-05-06 User Id=tstevens User Note=updated Instrument description Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) is a dual-frequency Doppler system consisting of a receiver flying aboard a satellite and a globally distributed network of ground beacons. The DORIS receiver on-board the orbiting satellite tracks the dual-frequency radio signals transmitted by the network of ground beacons and generates the DORIS data. A measurement is made of either the Doppler shift or absolute phase as the satellite’s orbit moves over the ground-based beacon. DORIS has been included as a host experiment on various space missions. Current missions with on-board DORIS receivers are CryoSat-2, HY-2A, Jason-3, Sentinel-6 Michael Freilich, and Satellite for ARgos and ALtiKa (SARAL). Legacy missions include TOPEX/Poseidon, Jason-1 and -2/OSTM, Envisat, and SPOT-4 and -5. Unlike many other navigation systems, DORIS is based on an uplink device. The receivers are on board the satellite while the transmitters are on the ground. This creates a centralized system in which the complete set of observations is downloaded by the satellite to the ground center, from where they are distributed after editing and processing. 2026-05-06T15:55:27.462Z