The Doris (Doppler Orbitography and Radiopositioning Integrated by Satellite) system is a French satellite system used for precise orbit and positioning determination. It is based on the Doppler Effect principle consisting of a terrestrial beacon network and onboard instruments of the satellite (antenna, radio receiver and oscillator ultra-stable). After more than two decades of continuous operation, the DORIS space geodesy system has demonstrated its capabilities for orbitography and navigation of the satellites, and also ground location. In association with the Laser technique it is providing a 2-cm accuracy in the radial component of the orbit.

The GFZ operates a data center associated with the IDS (International DORIS Service) contributing sporadically specialized analyses, particularly regarding orbits of satellite altimetry missions. Most recent activities include simulations of the influence of the DORIS network on the International Terrestrial Reference Frame (ITRF).