Main beam jammer cancellation and target angle estimation with a polarization-agile monopulse antenna

An alternative, more cost-effective approach to cancellation and angle estimation in airborne radars is proposed. A set of preformed, phase-steered, product-pattern monopulse beams are used to form adapted sum ( Sigma ) and difference ( Delta ) beams that yield undistorted target monopulse ratio est...

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Bibliographic Details
Published inProceedings of the IEEE National Radar Conference pp. 95 - 100
Main Author Clark, C.R.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1989
Subjects
Airborne radar
Bandwidth
Covariance matrix
Eigenvalues and eigenfunctions
Electronic countermeasures
Jamming
Performance analysis
Phase estimation
Signal to noise ratio
Yield estimation
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DOI10.1109/NRC.1989.47623

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Summary:An alternative, more cost-effective approach to cancellation and angle estimation in airborne radars is proposed. A set of preformed, phase-steered, product-pattern monopulse beams are used to form adapted sum ( Sigma ) and difference ( Delta ) beams that yield undistorted target monopulse ratio estimates while nulling both main-beam and sidelobe ECM (electronic countermeasures). The authors consider three approaches to optimal weight calculation. The first is a straightforward sample-matrix-inversion algorithm, which maximizes the signal-to-noise ratio in a prespecified look direction or, equivalently, minimizes the adapted beam residue subject to a unity-gain constraint in the prespecified look direction. The other two approaches to adaptive weight optimization are based on finding the eigenvector with the minimum eigenvalue for modified versions of R (the sample covariance matrix). Results of algorithm performance analysis are presented. The bandwidth effects of phase-steered antennas on the main beam canceller are also discussed.< >
DOI:10.1109/NRC.1989.47623