前视阵FDA-STAP雷达距离模糊杂波抑制方法

Range-ambiguous Clutter Suppression for Forward-looking Frequency Diverse Array Space-time Adaptive Processing Radar

高重复频率前视阵机载雷达地杂波不仅存在严重的距离依赖性,而且存在距离模糊问题,传统空时自适应处理(STAP)方法在距离依赖和距离模糊同时存在时难以有效实现杂波补偿和杂波抑制。针对距离模糊下的机载雷达杂波抑制问题,该文提出一种基于频率分集阵列STAP雷达的距离模糊杂波分离与抑制方法。该方法利用频率分集阵列发射导向矢量的距离角度2维依赖性,通过空间频率域子空间投影实现距离模糊杂波的分离,然后对分离后的杂波分别进行距离依赖补偿,最终实现无模糊区域和模糊区域的杂波抑制和运动目标检测。仿真实验验证了该文方法的有效性。

In a high pulse-repetitive-frequency forward-looking radar, the clutter echo is not only severely rangedependent but also range-ambiguous. It is therefore difficult to realize clutter compensation and suppression for conventional Space-Time Adaptive Processing （STAP） radar. To alleviate this problem, in this study, a novel range-ambiguous clutter suppression method is proposed for STAP radar with Frequency Diverse Array （FDA）. Because the transmit steering vector of the FDA is range-angle dependent, the range-ambiguous clutter can be separated in the spatial domain using a subspace projection approach. The separated clutter can then be compensated using the Doppler warping technique. Finally, the compensated clutter can be suppressed, and target detection is realized in both the unambiguous and ambiguous range regions. Simulation examples demonstrate the effectiveness of the proposed method.