多站雷达主瓣干扰抑制方法研究

主瓣压制式干扰是现代电子战中雷达所面临的重要干扰样式。在多站雷达系统下，由于干扰机宽波束的特点，各接收站接收到干扰信号是高度相关的，而目标在各探测方向上的散射特性不同，在各接收站中的回波信号是相互独立的。根据这一空间散射特性的差异，该文提出一种基于幅度比特征的多站雷达主瓣干扰抑制方法。在各接收站进行时间对齐后，对各时刻点的回波信号计算幅度比，将时域信号转化到幅度比特征域，在该特征域中，干扰的相关性导致其在背景中被“平滑”，目标回波的独立性使目标“凸显”。最后，在幅度比特征域设定固定门限，对目标进行恒虚警检测。仿真实验验证了该方法能够有效地抑制主瓣压制式干扰，并可改善主瓣干扰条件下的目标检测性能。

Main-Lobe Jamming Suppression Method in Multiple-Radar System

Main-lobe jamming is an important jamming pattern faced by radar in modern electronic warfare. In multiple-radar system, the received jamming signals in different receiving stations would be highly coherent due to the wide beam of jammer. However, the received target echoes are independent because of the random fluctuation of target radar cross section (RCS) with the variation of view angle. According to this fact, this paper proposes a main-lobe jamming suppression method based on the amplitude ratio feature. After the time alignment of each receiving station is performed, the time domain signal is converted into the amplitude ratio feature domain by making the amplitude ratio of the echo signals at each time point. In this feature domain, jamming signals would be "smoothed" in the background due to its correlation, and targets would be "highlighted" due to the independence of the target echoes. Finally, in the amplitude ratio feature domain, the target is subjected to constant false alarm detection with a fixed threshold. Simulation experiments show that the proposed method can effectively suppress the main-lobe jamming and improve the target detection performance under the main-lobe jamming condition.