Procedure for the independent reduction of acquisition thresholds and tracking of spread spectrum codes received in orbit

摘要

A procedure for independently reducing acquisition thresholds and tracking spread spectrum codes received in orbit by a receiver accessing an orbital navigator (internal or external to said receiver), wherein the receiver includes a phase loop and a code loop. The code loop that tracks the pseudo-random codes is "impelled" by a fine velocity aid and corrects the error between the real and calculated velocities. The code loop receiving pseudo-random codes is similarly "impelled" by the fine velocity aid, the code phase search being based on a phase prediction maintained by the fine velocity aid provided by the orbital navigator.