CAJ | 학술논문

机载雷达欺骗式主瓣干扰不仅会引起大量虚警，还会污染空时自适应处理(STAP)器的训练样本，引起自适应方向图畸变，导致期望信号相消和杂波抑制性能下降。针对此问题，利用目标信号与干扰信号极化特性的差异，该文提出一种极化-空域联合自适应波束形成的方法来抑制欺骗式主瓣干扰。该方法首先在多普勒清晰区挑选干扰样本，并采用特征融合技术估计干扰协方差矩阵，然后采用重叠滑窗的子阵合成方式进行极化-空域联合自适应波束形成，在抑制主瓣干扰的同时为后续杂波抑制保留了空域自由度，最后通过 STAP 抑制剩余的杂波。该算法可以有效滤除密集欺骗式干扰，减少由其引起的虚警，改善机载 STAP 雷达的杂波抑制性能。仿真结果验证了该方法的有效性。
궤재뢰체기편식주판간우불부회인기대량허경，환회오염공시자괄응처리(STAP)기적훈련양본，인기자괄응방향도기변，도치기망신호상소화잡파억제성능하강。침대차문제，이용목표신호여간우신호겁화특성적차이，해문제출일충겁화-공역연합자괄응파속형성적방법래억제기편식주판간우。해방법수선재다보륵청석구도선간우양본，병채용특정융합기술고계간우협방차구진，연후채용중첩활창적자진합성방식진행겁화-공역연합자괄응파속형성，재억제주판간우적동시위후속잡파억제보류료공역자유도，최후통과 STAP 억제잉여적잡파。해산법가이유효려제밀집기편식간우，감소유기인기적허경，개선궤재 STAP 뢰체적잡파억제성능。방진결과험증료해방법적유효성。
The deceptive mainlobe jamming of airborne radar not only causes a large amount of false alarms but also contaminates samples of the Space-Time Adaptive Processor (STAP). Hence, the performance on clutter suppression is degraded and signal self-cancellation occurs due to the distorted adaptive pattern. A polarization-space adaptive beamforming algorithm utilizing the polarization difference between the target signal and jamming is proposed for suppressing the deceptive mainlobe jamming. Firstly, the eigen-fusion based jamming covariance matrix is estimated by the samples obtained from clutter-free Doppler zone. Then, the polarization-space adaptive beamforming algorithm is carried out via synthesizing subarrays with overlapped window. This algorithm has the ability to suppress mainlobe jamming and retain the spatial degree of freedom for clutter suppression. Finally, the STAP is utilized to suppress the residual clutter. The proposed method can efficiently suppress the dense deceptive jamming, and hence, reduce the number of false alarms. The performance of STAP for clutter suppression can also be improved. Simulation results verify the effectiveness of the proposed method.