Patent ID: 7403559

Claim:
A method of reducing computations in forming a cross-correlation function of samples of a pseudorandom (PN) coded chipping received signal modulation, r(t), observed for an interval of time T at a receiver, and arbitrarily delayed samples of a noise-free receiver generated PN signal replica modulation, m(t), the steps of the method, comprising: summation of chip-polarity rectified received signal samples to produce samples of a single PN code modulation chip waveform, or part of a single PN code modulation chip waveform; generation of a signal receiver response function, p(t), for a single chip waveform, or part thereof having the transient response of the receiver; and cross-correlation of the samples of the single PN code modulation chip waveform, or part thereof, and samples of the signal receiver response function to produce the cross-correlation function.