Patent ID: 7292547

Claim:
A method for multiple access to a communications channel on a satellite comprising the steps of: transmitting a first modulated signal from a first site to a transponder; transmitting at least a second modulated signal from at least a second site to said transponder; transmitting a composite signal of said first and second signals to at least one receive location; modulating a carrier of said composite signal with an information bit stream by removing local modulation from said incoming composite signal by applying coarse and fine synchronization processes, determining an estimate of satellite-to-ground distance and hence signal delay time, determining a time-rate-of-change of said satellite-to-ground distance and hence carrier frequency shift, using said estimate to modify an outgoing signal thereby defining a replica of said outgoing signal, and subtracting said replicated signal from said composite signal, said outgoing signal being selected from a database of outgoing signals stored in an archive; and transmitting said outgoing signal from said at least two sites.