Methods and apparatus for increasing the effective resolving power of array antennas
First Claim
1. A method of increasing an effective resolving power of an array antenna comprising an array of antenna elements capable of implementing an array antenna beam pattern, the method comprising:
- (a) receiving a signal plus interference via the array antenna;
(b) selecting a plurality of evenly distributed angular directions within a main lobe of the array antenna beam pattern, the plurality of angular directions circumscribing an angle corresponding to a boresight of the array antenna beam pattern; and
(c) removing from the received signal plus interference, interference received at the array antenna from a direction corresponding to at least one of said angular directions.
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Accused Products
Abstract
Methods and apparatus for improving the effective resolving power of an array antenna are described that are not limited by the physical characteristics of the array. In an array with M elements, up to M−1 directional vectors may be selected, preferably at angles corresponding to the main lobe and/or side lobes of an array antenna beam pattern. A received signal plus interference (s+i) is zero-transformed to eliminate interference received from the plurality of selected directions. The zero-transformed s+i is then restored to obtain the signal of interest observed at maximum gain undisturbed by interference incident from arbitrarily close signal sources. The approach may be combined with conventional beamforming techniques to remove interference incident from angles corresponding to the side lobes, where conventional beamforming techniques are most effective.
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Citations
21 Claims
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1. A method of increasing an effective resolving power of an array antenna comprising an array of antenna elements capable of implementing an array antenna beam pattern, the method comprising:
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(a) receiving a signal plus interference via the array antenna; (b) selecting a plurality of evenly distributed angular directions within a main lobe of the array antenna beam pattern, the plurality of angular directions circumscribing an angle corresponding to a boresight of the array antenna beam pattern; and (c) removing from the received signal plus interference, interference received at the array antenna from a direction corresponding to at least one of said angular directions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for increasing an effective resolving power of an array antenna comprising an array of antenna elements capable of implementing an array antenna beam pattern, the apparatus comprising:
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an antenna array module to receive a signal plus interference; a processing module to select a plurality of evenly distributed angular directions within a main lobe of the array antenna beam pattern, the plurality of angular directions circumscribing an angle corresponding to a boresight of the array antenna beam pattern; and an interference module to remove from the received signal plus interference, interference received at the array antenna from a direction corresponding to at least one of said angular directions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A program product apparatus having a computer readable medium with computer program logic recorded thereon for increasing an effective resolving power of an array antenna comprising an array of antenna elements capable of implementing an array antenna beam pattern, said program product apparatus comprising:
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an antenna array module to receive a signal plus interference; a processing module to select a plurality of evenly distributed angular directions within a main lobe of the array antenna beam pattern, the plurality of angular directions circumscribing an angle corresponding to a boresight of the array antenna beam pattern; and an interference module to remove from the received signal plus interference, interference received at the array antenna from a direction corresponding to at least one of said angular directions. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification