针对去除主瓣干扰的同时会产生一定程度的主波束偏移的问题,文中通过理论推导阐述了协方差矩阵失配是造成产生主波束偏移的根本原因,分析揭示了协方差重构和对角加载方法减小协方差矩阵失配的机理解决主波束偏移的机理。通过仿真实验,分别在单个主瓣干扰和多个主瓣干扰条件下,对三种基于特征投影矩阵预处理的主瓣干扰抑制算法进行对比分析仿真验证。实验结果表明,基于特征投影矩阵预处理的主瓣干扰抑制算法能够有效去除多个主瓣干扰,提高输出信干噪比显著提高。最后,结合主瓣干扰存在的特殊性对输出信干噪比的计算公式进行适当修正。

The mainlobe interference suppression method based on eigen-projection matrix preprocessing will produce a certain degree of main beam offset while better removing the mainlobe interference. In view of the above problems, this paper expounds through theoretical derivation that the covariance matrix mismatch is the main cause of main beam offset, and analyzes the mechanism of covariance reconstruction and diagonal loading method to solve the main beam offset. Through simulation experiments, under the condition of single mainlobe interference and multiple mainlobe interference, three mainlobe interference suppression algorithms based on eigen-projection matrix preprocessing are compared and analyzed. Experimental results show that the mainlobe interference suppression algorithm based on eigen-projection matrix preprocessing can effectively remove multiple mainlobe interferences, and the output signal-to-interference-plus-noise ratio is significantly improved. Finally, the output signal-to-interference plus-noise ratio under the condition of mainlobe jamming is revised.

TN957

国家自然科学基金资助项目(61601474,61501469)