Patent ID: 6681181
Filing Date: 2004-01-20
Classification: G01S

Abstract:
A method of limiting the effect of interfering transmission on a GPS (Global Positioning System) receiver, the GPS receiver having a radio front-end and a radio back-end, the radio front-end performing down-conversion of at least one GPS radio signal received at a Radio Frequency (RF) to an Intermediate Frequency (IF), and the radio back-end deriving a bit stream of digital data from the at least one GPS radio signal after it has been down converted to the IF and processing the bit-stream of digital data, the method comprising the steps of:i) sensing an overload condition in the radio front-end when the received radio signal is above a threshold; ii) generating an overload signal upon sensing the overload condition of the radio front-end; iii) coupling the overload signal into the radio backend; and iv) substituting in the radio back-end the bit-stream of digital data with a locally generated bit pattern in response to the presence of the overload signal, the locally generated bit pattern being selected such that when processed it causes less noise to accumulate in the radio back-end than if the bit-stream of digital data were processed.