A method and system of improving sensitivity in the demodulation of a received signal over an arbitrary measurement time epoch, the method comprising the steps of: correlating the received signal in a coherent fashion (80); and utilizing a Viterbi phase state keying trellis demodulation with a variable...http://www.google.de/patents/US7599452?utm_source=gb-gplus-sharePatent US7599452 - Method and system for applying Viterbi type PSK demodulation for optimum correlation of GPS signals
