Patent ID: 7362264

Claim:
A GPS system configured to manage interference from disturbing signals, comprising: an antenna; an RF front end unit; a filtering unit; amplifying circuits comprising a Programmable Gain Amplifier configured to amplify a signal received from the filtering unit, an Analog to Digital Converter configured to convert the amplified analog signal into a digital signal, and an Automatic Gain Controller configured to control the gain of the Programmable Gain Amplifier according to the output from the Analog to Digital Converter; a carrier recovery unit; a correlation unit; a calculating unit that performs range calculations; a multiplying unit positioned between the carrier recovery unit and the correlation unit, wherein the multiplying unit is configured to multiply a signal from the carrier recovery unit to the correlation unit with either zeros, “0”, or ones, “1”; and a control logic unit configured to control the multiplying unit to using zeros, “0”, when an interference is detected and into using ones, “1”, when no interference is detected, wherein the control logic unit is further configured to measure a duty cycle of the highest magnitude bit of the Analog to Digital Converter and to interpret a change in the duty cycle of the highest magnitude bit as a detected interference when the highest magnitude bit is at or above a predetermined level, and the control logic unit is configured to interpret no detected interference when the measured duty cycle of the highest magnitude bit is below the predetermined level.