These measurements would complement those of the Gravesspacesurveillanceradar, also designed by ONERA, which determines the orbits of satellites flying over France. The Nostradamus radar antenna network
ONERA's teams have designed and developed the GRAVESspacesurveillance system to establish and maintain a database of satellites flying over France at altitudes of less than 1 000 kilometers... GRAVESSpaceSurveillance System: the receiving antennas... GRAVESSpaceSurveillance System: the four transmitting panels