Method and system for detecting signal sources in a surveillance space
First Claim
1. A method for determining a respective electromagnetic parameter and spatial disposition of one or more signal sources in a surveillance space simultaneously bombarded by multiple signals, the method comprising:
- receiving said multiple signals at each of a plurality of widebeam, wideband antennas that are spaced apart in a linear array by equal mutual spacings;
simultaneously sampling the respective signals Si,n of each of the antennas at a sampling rate to generate a two-dimensional array of sampled values Si,n, where Si,n is the n-th sample of the signal received at an antenna i;
calculating a two-dimensional Fourier transform Fjk of the array Si,n; and
identifying peaks in the Fourier transform satisfying one or more predetermined criteria, a peak satisfying the predetermined criteria being indicative of a signal source in the surveillance space, whereby the location of the peak in said two-dimensional Fourier transform Fjk indicates the frequency and the azimuth of the respective signal source and the amplitude of the peak indicates the amplitude of the signal source.
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Abstract
A respective electromagnetic parameter and spatial disposition of an unknown number of signal sources in a surveillance space simultaneously bombarded by multiple signals are determined by receiving multiple signals at each of a plurality of widebeam, wideband antennas equally spaced apart in a linear array. Respective antenna signals are simultaneously sampled to generate a two-dimensional array of values. A two-dimensional Fourier transform is computed whose peaks satisfy one or more predetermined criteria, each peak being indicative of a signal source in the surveillance space, whereby the location of the peak in the Fourier transform Fjk indicates the frequency and the azimuth of the respective signal source and the amplitude of the peak indicates the amplitude of the signal source. When implemented using two mutually perpendicular arrays of receiving antennas, an additional Fourier transform of the two-dimensional Fourier transform generates, for each identified emitter, independent azimuth and elevation angles.
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Citations
19 Claims
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1. A method for determining a respective electromagnetic parameter and spatial disposition of one or more signal sources in a surveillance space simultaneously bombarded by multiple signals, the method comprising:
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receiving said multiple signals at each of a plurality of widebeam, wideband antennas that are spaced apart in a linear array by equal mutual spacings; simultaneously sampling the respective signals Si,n of each of the antennas at a sampling rate to generate a two-dimensional array of sampled values Si,n, where Si,n is the n-th sample of the signal received at an antenna i; calculating a two-dimensional Fourier transform Fjk of the array Si,n; and identifying peaks in the Fourier transform satisfying one or more predetermined criteria, a peak satisfying the predetermined criteria being indicative of a signal source in the surveillance space, whereby the location of the peak in said two-dimensional Fourier transform Fjk indicates the frequency and the azimuth of the respective signal source and the amplitude of the peak indicates the amplitude of the signal source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining a respective electromagnetic parameter and spatial disposition of one or more signal sources in a surveillance space simultaneously bombarded by multiple signals, the system comprising:
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an antenna array having a plurality of spaced apart widebeam, wideband antennas that are spaced apart in a linear array by equal mutual spacings and are configured to receive said multiple signals; and a processor coupled to the antenna array and being configured to; sample the respective signals Si,n received by each of the antennas at a sampling rate to generate a two-dimensional array of sampled values Si,n, where Si,n is the n-th sample of the signal received at a detector i; calculate a two-dimensional Fourier transform Fjk of the array Si,n; and identify peaks in the Fourier transform satisfying one or more predetermined criteria, a peak satisfying the predetermined criteria being indicative of a signal source in the surveillance space, whereby the location of the peak in said two-dimensional Fourier transform Fjk indicates the frequency and the azimuth of the respective signal source and the amplitude of the peak indicates the amplitude of the signal source. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification