DORIS (satellite system)
Doppler-radio-based system for determination of satellite orbits and ground station locations / From Wikipedia, the free encyclopedia
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DORIS is a French satellite system used for the determination of satellite orbits (e.g. TOPEX/Poseidon) and for positioning. The name is an acronym of "Doppler Orbitography and Radiopositioning Integrated by Satellite" or, in French, Détermination d'Orbite et Radiopositionnement Intégré par Satellite.