有源压制干扰从雷达天线的主瓣进入雷达内部，干扰信号很强时，将严重影响雷达的检测性能。传统的旁瓣消隐、旁瓣相消以及低副瓣天线等技术难以奏效。文中分析了盲源分离技术应用雷达主瓣抗干扰时盲源分离的信号存在幅度、相位的不确定性，提出了一种联合盲源分离和分数阶傅里叶变换的雷达抗主瓣干扰的新方法。并给出新方法与传统脉冲压缩方法主瓣干扰抑制的仿真结果，仿真结果表明了在强噪声压制干扰环境中，新方法具有良好的抗主瓣干扰的性能。

Active suppressing jamming enters the internal radar from the main lobe of radar antenna, when the jamming signal energy is very strong, the detection performance of radar will be affected seriously. The traditional side-lobe anti-interference techniques such as side lobe blanking, side lobe cancellation and low side lobe antenna will not work. In this paper we analyze the uncertainty of the signal amplitude and phase for blind source separation technology application in main lobe radar anti-jamming and propose a new method of radar main lobe interference based on the combination of BSS and FRFT and give the simulation results of the main lobe interference suppression of the new method and the pulse compression method. The simulation results show that in the strong noise suppressing jamming environment, the new method has good performance for the main lobe interference.

TN973

国家自然科学基金资助项目；安徽省自然科学基金资助项目