Adaptive digital sub-array beamforming and deterministic sum and difference beamforming, with jamming cancellation and monopulse ratio preservation
First Claim
1. A method for detecting a radar target of interest in the presence of radar jamming interference, said method comprising the steps of:
- forming a plurality of sub-arrays from an antenna array;
forming a respective sub-array beam pattern for each of said plurality of sub-arrays;
wherein at least one null of each sub-array beam pattern is steered toward an interference; and
determining a sum beam from said sub-array beam patterns for detecting said target of interest.
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Accused Products
Abstract
A radar system and technique provide the capability to detect a target of interest and maintain the detection in the presence of multiple mainlobe and sidelobe jamming interference. The system and technique utilize the versatility of digital beamforming to form sub-arrays for canceling jamming interference. Jamming is adaptively suppressed in the sub-arrays prior to using conventional deterministic methods to form the sum, Σ, and difference, Δ, beams for monopulse processing. The system and technique provide the ability to detect a target of interest, provide an undistorted monopulse ratio, m, and maintain target angle estimation, in the presence of multiple mainlobe and multiple sidelobe jammers. Further, this system and technique are not constrained by requiring a priori knowledge of the jamming interference.
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Citations
18 Claims
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1. A method for detecting a radar target of interest in the presence of radar jamming interference, said method comprising the steps of:
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forming a plurality of sub-arrays from an antenna array;
forming a respective sub-array beam pattern for each of said plurality of sub-arrays;
wherein at least one null of each sub-array beam pattern is steered toward an interference; and
determining a sum beam from said sub-array beam patterns for detecting said target of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radar system for detecting a radar target of interest in the presence of interference, said system comprising:
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an antenna array for providing antenna array element data;
a summer for forming a plurality of sub-arrays from said antenna array element data;
a sub-array beamformer for forming a respective sub-array beam pattern from each of said plurality of sub-arrays;
wherein at least one null of each sub-array beam pattern is steered toward an interference;
a monopulse summer for forming sum beams from said sub-array beam patterns for detecting said target of interest. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A computer readable medium having embodied thereon a computer program for detecting a radar target of interest in the presence of a interference, the computer readable program comprising:
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means for causing a processor to form a plurality of sub-arrays from an antenna array;
means for causing said processor to adaptively form a respective sub-array beam pattern for each of said plurality of sub-arrays, wherein at least one null of each sub-array beam pattern is steered toward an interference and a boresight gain of each sub-array beam pattern is maintained;
means for causing said processor to determine sum and difference beams from said sub-array beam patterns; and
means for causing said processor to determine at least one monopulse ratio from said sum and difference beams for detecting a radar target of interest and for estimating an angle of arrival of said target of interest. - View Dependent Claims (18)
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Specification