CAJ | 학술논문

密集转发式干扰不仅会引起雷达虚警，而且会抬高其附近单元的恒虚警率检测门限进而导致目标检测性能下降。另外，它还会污染空时自适应处理的训练样本，导致杂波抑制性能下降。针对这些问题，该文提出一种机载雷达抗密集转发式干扰算法。该算法首先估计干扰方向，然后用广义旁瓣相消技术在空域滤除干扰。广义旁瓣相消中的辅助通道为指向干扰方向的和波束，而其协方差矩阵则利用清晰区中挑选的干扰样本估计得到。该算法可以有效抑制密集转发式干扰，减少由其引起的虚警，改善雷达目标检测性能，同时该算法还具有结构简单，易于实现的优点。实验结果验证了该算法的有效性。
밀집전발식간우불부회인기뢰체허경，이차회태고기부근단원적항허경솔검측문한진이도치목표검측성능하강。령외，타환회오염공시자괄응처리적훈련양본，도치잡파억제성능하강。침대저사문제，해문제출일충궤재뢰체항밀집전발식간우산법。해산법수선고계간우방향，연후용엄의방판상소기술재공역려제간우。엄의방판상소중적보조통도위지향간우방향적화파속，이기협방차구진칙이용청석구중도선적간우양본고계득도。해산법가이유효억제밀집전발식간우，감소유기인기적허경，개선뢰체목표검측성능，동시해산법환구유결구간단，역우실현적우점。실험결과험증료해산법적유효성。
Dense repeater jamming not only causes false alarms, but also raises the threshold of constant false alarm ratio detector nearby the jamming, which degrades the performance of targets detection. On the other hand, the samples contaminated by jamming degrade the performance of space time adaptive processing. To deal with these issues, a method to suppress dense repeater jamming is proposed. Firstly, the directions of the jammers are estimated. Secondly, Generalized Sidelobe Canceller (GSC) is used to cancellthe jamming in the spatial domain. The auxiliary channels of the GSC are the sum beams pointing at the jammers, and the covariance matrix of the GSC is estimated with the jamming samples selected from the clutter free region. The proposed method reduces the false alarms caused by the dense repeater jamming, and improves the performance of targets detection. In addition, the structure of this method is simple and easy to realize. Simulations are presented to verify the effectiveness of the proposed method.