脉冲多普勒雷达多假目标干扰抑制算法

摘要

In order to solve the multiple false targets interference by slicing jamming from Digital Radio Frequency Memory (DRFM),this paper presents a particle filter interference suppression algorithm based on negentropy detection by taking advantage of the difference between slicing jamming signal and target signal in time domain for pulse Doppler radar.Firstly,particle filter interference suppression is carried out.Abnormal variation of weight from each particle is used to detect jamming signal.Then,the result of one-step filtering is processed by using the negentropy of singular spectrum,which is utilized to suppress small jamming signal.By this interference suppression algorithm,jamming signal does not match with the matched filter.Finally,the simulation result shows that the proposed method can obtain higher detection probability and has better performance of interference suppression.%针对数字射频存储器(DRFM:Digital Radio Frequency Memory)产生的多假目标切片干扰问题,本文结合脉冲多普勒雷达工作体制,利用干扰信号和目标信号时域差异,提出了一种基于负熵检测的粒子滤波干扰抑制算法.首先,通过粒子滤波进行干扰抑制,该步利用各粒子权值的异常变化检测出干扰信号并进行抑制;其次,利用奇异谱负熵对滤波结果进行检测,对存在的小干扰信号进行二次干扰抑制,使干扰信号不再与匹配滤波器匹配,从而达到抑制干扰的目的.最后,仿真结果表明,本文算法具有较高的目标检测概率,达到较好的干扰抑制效果.