Concept information
Preferred term
IDS
Definition
- After a decade of fully operational functioning, the DORIS space geodesy system has demonstrated its capabilities for orbitography and navigation of the satellites and also ground location. It plays a key rule in the Topex/Poseidon altimetric mission for oceanography providing in association with the Laser technique a 2 cm accuracy in the radial component of the orbit. DORIS and Laser are renewed as the nominal orbitographic system for the Jason mission (end of 2000). DORIS also provides with Diode navigator on Spot 4 (1993), an orbit in real time within a few meters. It's a world first at this level of precision. Since 1994 and thanks to its more than fifty permanent beacon network, DORIS contributes to the IERS activities for the realization and maintenance of the ITRS (International Terrestrial Reference System). 3D positions and velocities of the reference sites at a cm and mm/yr accuracy lead to scientific studies (investigations) in the fields of global and regional tectonics. Two recent DORIS results appear very encouraging for the future. One concerns a seasonal effect of earth surface fluid mass redistribution (oceanic water, atmospheric masses, snow, ...) on the relative positions of the earth mass and earth figure centers. Another concerns vertical displacement of the crust monitored near tides-gages. This information is of major interest for the topic of sea level variations and correlation to the Global Change. Such as the other space geodesy techniques GPS, VLBI, SLR, there is a strong demand among the scientific community to create an International DORIS Service, so called IDS. The CSTG, commission for international co-ordination of space techniques for geodesy of the International Association Geodesy (IAG) and the IERS directing board decided in July 1999 to initiate a DORIS Pilot Experiment. Its objective is to assess the need and feasibility of an International DORIS Service. For more information, link to "http://ids.cls.fr/welcome.html" (en)
Broader concept
- G - I (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/eb784368-9b92-49b0-afc5-ea820e996f33
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