Geo-Directed Adaptive Antenna Array
First Claim
1. A method of characterizing the response of an antenna array having a plurality of antenna elements, comprising:
- providing a reference receiver;
receiving a signal at said reference receiver;
receiving a signal at each of said plurality of antenna elements;
computing a cross-ambiguity function between the reference receiver and each antenna element resulting in an array of cross-ambiguity functions;
identifying a region in each of said cross-ambiguity functions of said array corresponding to a source of signals; and
analyzing said region in each of said cross-ambiguity functions of said array to determine the relative phase and gain response of said plurality of antenna elements.
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Accused Products
Abstract
Systems and methods for on-the-fly characterization of an arbitrary array of antenna elements are provided. An array of arbitrary antenna elements and a reference receiver is provided. A location for a target source of signals is provided or assumed. Cross ambiguity functions are computed between the signal received by the reference receiver and the signal received by each antenna element. The cross ambiguity functions are analyzed to determine the phase and amplitude response of the antenna array to signals originating from the location of the target source of signals.
37 Citations
21 Claims
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1. A method of characterizing the response of an antenna array having a plurality of antenna elements, comprising:
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providing a reference receiver; receiving a signal at said reference receiver; receiving a signal at each of said plurality of antenna elements; computing a cross-ambiguity function between the reference receiver and each antenna element resulting in an array of cross-ambiguity functions; identifying a region in each of said cross-ambiguity functions of said array corresponding to a source of signals; and analyzing said region in each of said cross-ambiguity functions of said array to determine the relative phase and gain response of said plurality of antenna elements. - View Dependent Claims (2, 3, 4)
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5. A method of adjusting an antenna having a plurality of antenna elements, comprising:
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providing a reference receiver; receiving a signal at said reference receiver; receiving a signal at each of said plurality of antenna elements; computing a cross-ambiguity function between the reference receiver and each antenna element resulting in an array of cross-ambiguity functions; identifying a region in each of said cross-ambiguity functions of said array corresponding to a source of signals; analyzing said region in each of said cross-ambiguity functions of said array to determine the relative phase and gain response of said plurality of antenna elements; based on said analyzing step;
computing phase and gain adjustments to apply to the signals received at each of said plurality of antenna elements; andapplying said computed phase and gain adjustments to apply to the signals received at each of said plurality of antenna elements. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of iteratively nulling interference with an antenna array having a plurality of antenna elements, comprising:
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providing a reference receiver; computing a first set of cross-ambiguity functions between said reference receiver and each of said antenna elements; analyzing said cross-ambiguity functions to distinguish a first interfering signal peak present in all cross-ambiguity functions; analyzing said first distinguished peak in each of said cross-ambiguity functions to determine the relative phase and gain response of said plurality of antenna elements; based on said analyzing step;
computing phase and gain adjustments to apply to the signals received at each of said plurality of antenna elements; andapplying said computed phase and gain adjustments to apply to the signals received at each of said plurality of antenna elements such that a null is formed in the direction of the first distinguished peak; computing a second set of cross-ambiguity functions between any combination of antenna elements having a null directed at the first interferer. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method of geolocating a source of signals with an antenna array having a plurality of antenna elements, comprising:
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providing a reference receiver; computing a first set of cross-ambiguity functions between said reference receiver and each of said antenna elements; analyzing said cross-ambiguity functions to distinguish a first interfering signal peak present in all cross-ambiguity functions; analyzing said first distinguished peak in each of said cross-ambiguity functions to determine the relative phase and gain response of said plurality of antenna elements; based on said analyzing step;
computing phase and gain adjustments to apply to the signals received at each of said plurality of antenna elements; andapplying said computed phase and gain adjustments to apply to the signals received at each of said plurality of antenna elements such that a null is formed in the direction of the first distinguished peak; computing a second set of cross-ambiguity functions between any combination of antenna elements having a null directed at the first interferer analyzing said second set cross-ambiguity functions to distinguish a second signal peak present in all cross-ambiguity functions analyzing the TDOA and FDOA of said second peak to determine its geographical location.
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Specification