Patent ID: 6707843
Filing Date: 2004-03-16
Classification: G01S,H04B

Abstract:
A spread spectrum radio signal receiver comprising:a first signal tracking channel adapted to track a first received signal and measure its amplitude, code phase and received frequency, the first received signal being part of a first compound signal further comprising a second received signal, the first and second received signals broadcast on the same carrier frequency band and modulated by first and second codes, respectively, the codes each having a known number of code phases; a second signal tracking channel; and a processor adapted to perform the following functions: (a) select the received frequency and code phase of the second received signal; (b) operate the second signal tracking channel at the selected received frequency and code phase of the second received signal to receive a second compound signal comprising the first and second received signals; (c) compute the predicted code and frequency domain crosscorrelation of the first received signal with the second received signal; (d) multiply the amplitude of the first received signal with the predicted crosscorrelation to compute the interference between the first and second received signals; and (e) subtract the interference from the second compound signal to extract the second received signal including at least one of its received frequency, amplitude and code phase.