Doris, the space surveyor

Doris receiving antenna under the satellite. It receives signals from the terrestrial beacons network (its length is 42 cm). Credits Mira Productions.

The Doris system is a french civil precise orbit determination and positioning system. It is based on the principle of the Doppler effect with a transmitting terrestrial beacons network and onboard instruments on the satellite's payload (antenna, radio receiver and oscillateur ultra-stable).

Doris is one of three systems used for precise determination of the Jason-1 satellite's orbit. Several of these techniques are sometimes merged on the same satellite : Jason-1 satellite includes three tracking systems, Doris, location by GPS and laser telemetry. The Doris system perfectly corresponds to the specifications required for the ocean's topography observations and the amplitude of the observed phenomena: it is now enables to measure the satellite position on its orbit close to 1 cm. It is interesting to compare this precision with the precision obtained at the beginning of the space age, where the the satellite position was estimated close to 20 km then close to 20 meters in the 80's. Since 1998, the Diode navigator has added real-time measurement processing capability for satellite navigation.

The Doris system was designed by Cnes, the French space agency, in partnership with France's mapping and survey agency IGN and the space geodesy research institute GRGS. Since 2003, IDS is an international service which provides a support, through Doris data and products. The successive missions on Spot 2, Spot 3, Spot 4, Topex/Poseidon, Spot 5, Jason-1&2, Envisat and Cryosat-2 and those to follow Pléïades, Saral and HY-2 has truly demonstrated its performance.

 

Principle
How does Doris work? The Doris system is based on the principle of the Doppler effect. It is a system optimized for orbit determination with extreme precision, global coverage and all-weather measurements.
DORIS system
Details on Doris instrument which is part of the satellite payload, on terrestrial stations, on control and processing center and on system enhancements.
DORIS applications
In addition to its functions in orbitography, Doris as a space surveyor is also a terrestrial positioning system that has found many applications in geodesy and geophysics.
DORIS missions
With more satellites carrying the Doris instrument, the system will make more accurate than before.
  • Leaflet 2012, "Doris, a permanent evolving space technique for Earth sciences research" (pdf, 1.6 Mb). Aposter also exists (pdf, 3.3 MB)
  • Dossier 2010 : Doris, the space surveyor (pdf, 6 Mo),  edited by Cnes and IGN at the occasion of the 20th anniversary of Doris in 2010.
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