GPS receiver and method for detecting a jammer signal using fast fourier transform
First Claim
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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Abstract
A global positioning system (GPS) receiver and method are provided for detecting a jammer signal using fast Fourier transform (FFT). A correlator correlates GPS signals received from GPS satellites with codes based on a plurality of carrier frequency signals having predetermined frequency offsets therebetween, and computes n correlated samples associated with each of the GPS satellites. A memory stores the n correlated samples associated with each of the GPS satellites and n FFT bins corresponding thereto. A FFT processor transforms the n correlated samples read from the memory using n-point FFT to obtain the n FFT bins, and transfers the n FFT bins to the memory. A peak detector detects largest peaks exceeding a lowered detection threshold from the FFT bins associated with each of the GPS satellites. A jammer detection unit makes a determination as to whether a peak relatively far away from other peaks is present among the largest peaks, and detects a signal of a peak far away from other peaks.
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Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A global positioning system (GPS) receiver for detecting a jammer signal using fast Fourier transform (FFT), comprising:
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a correlator for 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;
a memory for storing the n correlated samples associated with each of the GPS satellites and n FFT bins corresponding thereto;
a FFT processor for transforming the n correlated samples read from the memory using n-point FFT to obtain the n FFT bins, and transferring the n FFT bins to the memory;
a peak detector for detecting largest peaks exceeding a lowered detection threshold from the FFT bins associated with each of the GPS satellites; and
a jammer detection unit for 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. - View Dependent Claims (7, 8, 9, 10)
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Specification