旁瓣对消技术是数字阵列雷达对抗干扰的一种主要措施。针对旁瓣对消技术在数字阵列雷达中的应用,提出了一种基于最大信干噪比准则的旁瓣对消性能衡量指标,并利用该指标对全空域干扰进行了遍历,发现部分辅助单元组合在面对全空域干扰时,会出现旁瓣对消性能下降的现象。然后,从接收信号与对消后的和波束两个方面分析了该性能下降现象的原因。最后,给出了一种改善旁瓣对消性能下降的方案,并利用仿真实验验证了该方案的有效性。研究表明,辅助单元位置不得当会引起旁瓣对消性能的下降,采取长短基线法可有效避免性能下降情况的出现。

Sidelobe cancellation is a mainstream anti-jammer technique for digital array radar. For the application of the sidelobe cancellation in digital array radar, a sidelobe canceller′s performance measurement index based on maximum signal to interference noise ratio criterion is proposed in this paper. Using the index, the full airspace jammer is traversed, and it is found that the performance of sidelobe cancellers will decrease when some auxiliary element combinations face full airspace jammer. Then the cause of the performance degradation from two aspects of the received signal and beam pattern is analyzed. Finally, a method to improve the performance of the sidelobe canceller is proposed, and numerical experiments are carried out to verify the effectiveness of the method. The research shows that the improper selection of auxiliary element positions will lead to the decline of the sidelobe canceller′s performance, and taking the long-short baselines can effectively avoid the decline of performance.

TN974