The monopoulse technique for target angle estimation fails when there is sidelobe and/or mainlobe jamming. If not effectively encountered, electronic jamming prevents successful radar target detection and tracking. We have developed a technique which cancels one mainlobe jammer and multiple sidelobe jammers in such a way that enables both target detection and unbiased monopulse angle estimation. Our technique makes use of adaptive digital beamforming for sidelobe jamming cancellation followed by a mainlobe canceller for mainlobe jamming cancellation. A constrained adaptation is imposed to maintain the mainbeam in the sidelobe cancellation process.
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