Doris

Information by CDDIS:

The Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) was developed by the Centre National d'Etudes Spatiales (CNES) with the cooperation of Groupe de Recherche en Géodésie Spatiale (GRGS) and the Institut Géographique National (IGN). The system was developed to provide precise orbit determination and high accuracy location of ground beacons for point positioning. An accurate measurement is made of the Doppler shift on radiofrequency signals emitted by the ground beacons and received on the spacecraft.

In addition to POD applications some of the scientific uses of DORIS data include:

Realization of global accessibility to and the improvement of the International Terrestrial Reference Frame ( ITRF)
Monitoring deformations of the solid Earth
Monitoring crustal deformation at tide gauges
Monitoring variations in the hydrosphere (sea level, ice-sheets, etc.)
Orbit determination for scientific satellites

Service

International DORIS Service (IDS)