DORIS is a dual-frequency Doppler system that has been included
as a host experiment on various space missions. The current
missions with on-board DORIS receivers are TOPEX/Poseidon,
Jason-1, Envisat, and SPOT-2, -4, and -5.
Unlike many other navigation systems, DORIS is based on an
uplink device. The receivers are on board the satellite while
the transmitters are on the ground. This creates a centralized
system in which the complete set of observations is downloaded
by the satellite to the ground center, from where they are
distributed after editing and processing.
The DORIS permanent tracking network includes 51 beacons with
an even geographical distribution; this network is utilized
by all missions with on-board DORIS receivers. Installation
and maintenance of this ground network is performed by IGN.
This map of the DORIS network is also available in PDF form.
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.
Some of the scientific uses of DORIS data include:
- Precise orbit determination
- Maintenance of global accessibility to, and the improvement of,
the International Terrestrial Reference Frame (ITRF)
- Monitoring Earth rotation
Related DORIS data and information links:
- DORIS information at:
- Missions with on-board DORIS receivers:
description of the CDDIS DORIS data