rf interference suppression in ultrawideband radar receivers

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Abstract
Airborne surveillance and ultra wideband radars operating at low frequencies experience co- channel (or in-band) electromagnetic RF interference (RFI) from nonhostile emitter sources (e.g. fixed and mobile communications). Although many of these interference sources will be received in the antenna sidelobe region, approximately 30-35 dB down, a significant number will be encountered in the mainbeam. This paper describes an algorithm that 'notches' out the mainbeam, in-band interference sources, while simultaneously 'equalizing' or compensating for the range-time sidelobes that results from the 'notching' process. Target resolution performance and SAR imaging integrity is maintained with the RFI suppression technique and algorithm developed. The algorithm developed by Grumman, is referred to as the minimization algorithm. This paper describes in detail the derivation of this algorithm and presents performance results of its application against numerous RFI data scenarios.

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