Doris system

The Doris system includes all the instruments onboard the carrying satellite (antenna, receiver, oscillator), an international network of autonomous stations spread around the globe and a control and processing center that calculates the orbit of the satellites.

Whether onboard satellites or on the ground stations network, the efficacy of the system has evolved over the years to achieve a precision up to the centimeter with Jason-1. The integration of Diode, software that calculates real-time location and very precise velocity of the satellite, marked a milestone advance.

Instruments onboard: The Doris instrument is part of the satellite payload. It comprises a MVR receiver that measures radial velocity, an omnidirectional antenna and an ultrastable oscillator.
Ground beacons: The Doris system now includes about 60 stations spread around the globe, in an international network of autonomous stations used as reference points on the ground to cover the satellites trajectory continuously.
Control and processing center: The data are relayed to the ground on each pass of the satellite over a station. Then they are sent to Ssalto at reguliar interval, the Doris mission control centre.
A system constantly evolving: Whether onboard satellites or on the ground stations network, the efficacy of the system has evolved over the years to achieve a precision up to the centimeter with Jason-1.
Diode: Diode is a software integrated in the Doris instrument that calculates on-board very precise real-time location and velocity of the satellite.