摘要
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。
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.
出处
《电子与信息学报》
EI
CSCD
北大核心
2014年第5期1049-1054,共6页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61372133
61101241)
中央高校基本科研业务费专项基金(K5051102008)资助课题
