Military - R&D Links: www.space.com
By: nico
"GRAVES (Grand Réseau Adapté à la Veille Spatiale) is a French radar-based space surveillance system, akin to the American NAVSPASUR. Using radar measurements, the French Air Force is able to spot satellites orbiting the Earth and determine their orbit. The GRAVES system took 15 years to develop, and became operational in November, 2005. GRAVES is a bistatic radar system using Doppler and directional information to derive the orbits of the detected satellites."
