Global space radiopositioning and radionavigation system, beacon and receiver used in this system

A global system dedicated to radionavigation and radiopositioning, having a land segment, a space segment and a user segment, the land segment comprising:

• a global network of beacons on the ground emitting an upwards single-directional radioelectric wide spectrum signal towards user satellites, each of the global network of beacons transmitting a message containing an identification code;
• a control center configured to prepare work plans for some user satellites and transmit the work plans when the user satellites overfly master beacons, each of said work plans including at least one of a client beacon number and an observation period;
• a processing center configured to receive remote measurements sorted by mission and control center, separate remote measurements into two groups, one containing remote measurements necessary for processing information specific to the processing center, and the other containing remote measurements specific to some clients of services offered by the system, wherein
• the space segment being composed of master satellites and client satellites, the master satellites participating closely in operation of the system, and
• the user segment is composed of client beacons and client receivers, and associated fixed or mobile carriers.