System of two satellites for laser ranging.
French programme: CNES responsible of design, development and operations.
Platform stabilised by exploiting the Earth's magnetic field. .
Design lifetime: several decades.
Elliptical drifting orbits, height 500-1700 km, inclination around 40°.
The two satellites were launched at one-week time distance.
For more details, see http://ilrs.gsfc.nasa.gov/missions/satellite_missions/past_missions/di1c_general.html.
Satellite positioning provided by means of dual-frequency Doppler transmitters.
Data managed within the International Laser Ranging Service (ILRS)
1967 - 2050
Associated satellites and instruments
Note: red tag => no longer operational , green tag => operational
, blue tag => planned