阅读以下科研文段并进行语法错误纠正及润色修改：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

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