雷达主瓣抗干扰技术研究现状及发展趋势

现代电子战中，雷达干扰信号不仅局限于副瓣干扰，同时对雷达主瓣做出干扰，使得雷达目标检测变得困难。近二十年间，国内外学者针对该问题展开了诸多研究，提出了一系列抗主瓣干扰的方法，取得了阶段性成果。其总体上包含空间自适应对消、阻塞矩阵预处理、特征投影矩阵预处理、盲相分离等方法。但在应用过程中，雷达主瓣抗干扰存在当干扰信号与目标回波信号DOA间隔很小时（即主瓣邻近目标压制干扰），抗干扰性能将急剧下降，空域上难以分辨的问题。

雷达斜投影滤波是常见雷达抗主瓣干扰的方法之一，能有效对抗主瓣邻近目标干扰，再利用现代阵列雷达信号处理，能有效实现在空域-极化域的雷达抗干扰，显著提高雷达信号的信噪比和探测性能。目前，雷达投影滤波技术在国内外都得到了广泛应用，并且应用场景和范围也非常广泛。

In modern electronic warfare, radar interference signals are not only limited to sidelobe interference, but also interfere with the radar mainlobe, making radar target detection difficult. Over the past twenty years, scholars at home and abroad have conducted extensive research on this issue and proposed a series of anti-mainlobe interference methods, achieving phased results. These methods generally include spatial adaptive cancellation, blocking matrix preprocessing, feature projection matrix preprocessing, blind source separation, and so on. However, in the application process, the anti-interference performance of the radar mainlobe will sharply decrease when the interference signal is close to the target echo signal DOA (i.e., suppressing interference near the mainlobe), resulting in difficulties in distinguishing targets in the spatial domain.

Radar oblique projection filtering is one of the common methods for radar anti-mainlobe interference, which can effectively resist interference near the mainlobe of the target. By utilizing modern array radar signal processing, it can effectively achieve radar anti-interference in the spatial-polarization domain, significantly improving the signal-to-noise ratio and detection performance of radar signals. Currently, radar projection filtering technology has been widely used both domestically and internationally, with a very broad range of application scenarios and scope.