Patent ID: RE41027

Claim:
In a satellite communications system involving a satellite vehicle SV 1 and a second satellite vehicle SV 2 moving relative to one another, a method for compensating at least one of a transmission frequency associated with SV 1 and a received frequency associated with SV 2 , the method comprising the steps of: predicting a motion of satellite vehicle SV 1 and generating a first output signal representative of the predicted motion of satellite vehicle SV 1 ; predicting a motion of satellite vehicle SV 2 and generating a second output signal representative of the predicted motion of satellite vehicle SV 2 ; supplying said first output signal and said second output signal to a processor and computing in said processor at least one of a compensating transmission frequency and a compensated receiving frequency based on said first output signal and said second output signal; determining an actual motion of SV 1 and generating a third output signal representative of the actual motion of SV 1 ; determining an actual motion of SV 2 and generating a fourth output signal representative of the actual motion of SV 2 ; supplying said first output signal and said third output signal to a first summing junction and generating a first feedback signal representative of the difference between said first output signal and said third output signal; supplying said second output signal and said fourth output signal to a second summing junction and generating a second feedback signal representative of the difference between said second output signal and said fourth output signal; using said first feedback signal to improve the accuracy of said first output signal; and using said second feedback signal to improve the accuracy of said second output signal.