Patent ID: 7724807
Filing Date: 2010-05-25
Classification: G01S,H04B

Abstract:
1. A method for reducing auto-correlation and cross-correlation in a GPS receiver co-located with a cellular telephone, comprising: transmitting and receiving cellular telephone signals using a cellular telephone transceiver; correlating an incoming GPS signal with a locally generated signal, using a first data path; verifying the incoming GPS signal against a lock signal using a second data path, determining, using the second data path, whether the incoming GPS signal has at least one characteristic that differentiates the incoming GPS signal from a correlated signal selected from a group consisting of an auto-correlated signal and a cross-correlated signal, wherein the at least one characteristic is selected from a group consisting of a correlation to a different satellite code being stronger than the correlation to a desired satellite code, and a correlation to a different delay of the incoming GPS signal being stronger than the correlation to the first data path's locally generated code delay; monitoring the first data path; and continuing to search for a second incoming GPS signal when the incoming GPS signal does not contain the at least one characteristic.