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.


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    Title :

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


    Additional title:

    Unterdrueckung des Hauptstoerstrahles und Zielwinkelabschaetzung mit einer polarisationsagilen Monopulsantenne


    Contributors:
    Clark, C.R. (author)


    Publication date :

    1989


    Size :

    6 Seiten, 4 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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