高频雷达工作环境中存在大量人为和非人为的外部干扰,严重影响了雷达设备正确检测目标,限制了高频雷达的正常工作性能;尤其在外部干扰进入波束主瓣的情况下,传统自适应波束形成器将出现主瓣畸变、旁瓣电平抬高等现象；提出了一种基于失配处理的自适应外部干扰抑制系统——通过主通道的匹配处理、虚拟辅助通道的失配处理,再经过相参旁瓣对消自适应波束形成技术实现对外部干扰尤其是主瓣干扰的抑制;通过仿真实验及同频主瓣干扰存在情况下的实测数据的处理结果,干扰能量下降29～47dB,充分验证了该系统的有效性和实用性.%Artificial and non- artificial external interference are the major performance limiting factors of high frequency radar. Especially when the interference falls into the main lobe, the beam pattern is distorted with conventional adaptive digital beam former for the sake of suppressing the main-lobe interference. In this paper, a system for suppressing external interference is proposed. The radar data are processed through the main channel's matched processing module and virtual auxiliary channel's mismatched processing module in this system. Then the outputs of these two modules are put into an adaptive beam former based on coherent side-lobe cancellation algorithm. Effectiveness and practicality of this interference suppression system are confirmed by simulation data and real data with the main-lobe interference existence processing results, the power of the interference decreased by 29 -47dB.
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