Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)

satellite

Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) measures the radio signals from 55 global ground stations that compose the International DORIS Service (IDS). Each ground station acts as a beacon to broadcast two stable radio frequencies at 2036.25 MHz (S-band) and 401.25 MHz (VHF). Every 10 seconds, the DORIS instrument aboard Sentinel-6 Michael Freilich measures the Doppler shift of the radio beacons' frequencies to precisely determine its line-of-sight velocity. Over time, an accurate 3D position of the satellite can be determined. 

DORIS

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