Patent ID: 6496533
Filing Date: 2002-12-17
Classification: G01S,H04B

Abstract:
A global positioning system (GPS) receiver, comprising:a search engine including a signal memory for storing a representation of a certain time period of an incoming signal at a first rate; and a comparator for comparing the same said stored signal representation to a plurality of replicas at a second rate higher than said first rate and indicating signal acquisition of said incoming signal when a particular one of said replicas correlates with said stored signal representation; and a tracking module for initializing a tracking replica according to said particular replica and comparing a real time representation of said incoming signal to said tracking replica at a third rate, lower than said second rate, for providing tracking correlations; and adjusting said tracking replica according to said tracking correlations, whereby the GPS receiver uses said search engine for acquiring said incoming signal at a faster rate and uses the tracking module for tracking said incoming signal at a slower rate.