Patent ID: 7447258
Filing Date: 2008-11-04
Classification: G01S,H04B

Abstract:
1. A method for performing reacquisition in a positioning receiver comprising: receiving at least one spread spectrum modulated signal, forming a plurality of reference signals, each reference signal having a different code delay, each reference signal based on a reference code corresponding to the code used in the modulation of the signal to be received, summing the received signal and each reference signal using two different lengths of time so as to produce two different summed outputs based on the received signal and each reference signal, and making a correlation between the received signal and each reference signal, using said two different summed outputs based on the received signal and each reference signal so that said correlation is performed in at least a first part and a second part using said different lengths of time in said first part and in said second part to determine said correlation for said first part and for said second part.