基于频率分集阵列的机载雷达距离模糊杂波抑制方法

Range Ambiguity Clutter Suppression for Airborne Radar Based on Frequency Diverse Array

针对机载预警雷达运动目标存在距离模糊的问题,该文提出一种基于频率分集阵列体制的空时自适应处理(STAP)距离模糊杂波抑制方法。该方法利用频率分集引入的距离维可控自由度,将距离模糊数反映到信号的导向矢量中,通过将不同距离模糊区域的杂波和目标信号在空间频率域实现分离,并在不同的距离模糊区实现杂波抑制。该方法仅在一个脉冲重复频率下即可实现运动目标检测和距离解模糊,大大提高了机载雷达系统的性能。仿真实验验证了该文方法的有效性。

Focusing on the range ambiguity of the moving target in airborne radar system, a novel Space-Time Adaptive Processing（STAP） approach based on frequency diverse array configuration is proposed for range ambiguous clutter suppression. In the proposed method, the controllable degree-of-freedom is exploited, which is introduced by the frequency diverse. The range ambiguity number is incorporated into the steering vector of the target signal. By separating the different range ambiguous range region in the spatial frequency domain, the target can be detected separately within each range region and thus range ambiguity can be resolved. By using the proposed method, giving only one pulse repetition frequency, the moving target can be detected and the range ambiguity can be resolved simultaneously, which improves the performance of airborne radar evidently. Simulation results demonstrate the effectiveness of the proposed method.