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 antennas that are spaced apart in a linear array by predefined spacings;
simultaneously sampling the respective signals of each of the antennas at a predetermined 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 of sampled values Si,n; and
identifying peaks in the Fourier transform satisfying one or more predetermined criteria, wherein an identified peak satisfying the predetermined criteria is indicative of a signal source in the surveillance space, and wherein a location of the peak in the Fourier transform Fjk indicates a frequency and an azimuth of the respective signal source and an amplitude of the peak indicates an amplitude of the signal source; and
for the identified peak, calculating the frequency of the respective signal source using an algebraic involving the predetermined sampling rate.
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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
18 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 antennas that are spaced apart in a linear array by predefined spacings; simultaneously sampling the respective signals of each of the antennas at a predetermined 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 of sampled values Si,n; and identifying peaks in the Fourier transform satisfying one or more predetermined criteria, wherein an identified peak satisfying the predetermined criteria is indicative of a signal source in the surveillance space, and wherein a location of the peak in the Fourier transform Fjk indicates a frequency and an azimuth of the respective signal source and an amplitude of the peak indicates an amplitude of the signal source; and for the identified peak, calculating the frequency of the respective signal source using an algebraic involving the predetermined sampling rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
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10. 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 antennas that are spaced apart in a linear array by predefined 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 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 a location of the peak in said two-dimensional Fourier transform Fjk indicates a frequency and an azimuth of the respective signal source and an amplitude of the peak indicates an amplitude of the signal source, wherein the processor is configured to calculate, for an identified peak satisfying the one or more predetermined criteria, the frequency of the respective signal source indicated by the peak using an algebraic involving the sampling rate. - View Dependent Claims (11, 12, 13, 14, 15, 17)
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18. 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 antennas that are spaced apart in a linear array by predefined spacings; simultaneously sampling the respective signals of each of the antennas at a predetermined 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 mathematical transformation over the array Si,n giving rise to a product of the mathematical transformation Fjk having a frequency dimension and an azimuth dimension; identifying peaks in the product of the two dimensional mathematical transformation, wherein the identified peaks are peaks that satisfy a predetermined criterion that is indicative of a signal source in the surveillance space; and processing data related to the identified peaks to determine a frequency and an azimuth of the respective signal source, and to determine an amplitude of the signal source wherein the frequency of the respective signal source is calculated using an algebraic involving the predetermined sampling rate.
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Specification