A receiver that receives a plurality of signals that are modulated with a common carrier, where each signal of said signals originates at a different source and experiences a transit delay and Doppler frequency shift before reaching the receiver, and where the transit delay and Doppler frequency shift...http://www.google.ca/patents/US8068054?utm_source=gb-gplus-sharePatent US8068054 - Receiver with means for ensuring bona fide of received signals
