Patent ID: 6813500
Filing Date: 2004-11-02
Classification: G01S,H04W,Y02D

Abstract:
A cellular telephone, comprising:a GPS digital signal processor for receiving a GPS satellite signal from a GPS satellite and a pseudo-GPS signal from a GPS pseudolite, said pseudo-GPS signal transmitted in on/off bursts having pseudorandom intervals between said bursts; and a navigation program coupled to the GPS digital signal processor having instructions for using said GPS signal and said pseudo-GPS signal for determining a location of said cellular telephone; wherein: the GPS digital signal processor determines a time-of-arrival of said GPS satellite signal; and includes a pseudolite pseudorandom (PRN) code generator for providing a replica pseudolite PRN code, a burst code multiplier for multiplying said replica pseudolite PRN code with a representation of said pseudo-GPS signal for providing burst code products, and a burst correlator for accumulating said burst code products for determining a time-of-arrival of said pseudo-GPS signal; and the navigation program uses said time-of-arrival of said GPS satellite signal with said time-of-arrival of said pseudo-GPS signal for determining said location.