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GPS receiver and method for detecting a jammer signal using fast fourier transform

  • US 20050285781A1
  • Filed: 04/21/2005
  • Published: 12/29/2005
  • Est. Priority Date: 06/29/2004
  • Status: Abandoned Application
First Claim
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1. A method for detecting a jammer signal using fast Fourier transform (FFT) in a global positioning system (GPS) receiver, comprising:

  • correlating GPS signals received from GPS satellites with codes based on a plurality of carrier frequency signals having predetermined frequency offsets therebetween, and computing n correlated samples associated with each of the GPS satellites;

    transforming the n correlated samples associated with each of the GPS satellites using n-point FFT to output n FFT bins;

    detecting largest peaks exceeding a lowered detection threshold from the FFT bins associated with each of the GPS satellites; and

    making a determination as to whether a peak relatively far away from other peaks is present among the largest peaks, and detecting, as a jammer signal, a signal of a peak far away from other peaks.

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