一种对LFM雷达的延时变脉宽干扰方法  

A Delay-Variable Pulse Width Frequency-Shift Jamming for LFM Radar

作　　者：刘东青[1] 王振华[1] 徐鹏 唐汇禹 常春贺[1] 

机构地区：[1]空军预警学院 [2]中国人民解放军95910部队

出　　处：《雷达科学与技术》2017年第6期656-660,共5页Radar Science and Technology

摘　　要：针对线性调频脉冲压缩雷达传统的固定式移频干扰会在延时和频移之间存在耦合作用,使附有频移的回波信号经过匹配滤波处理后主峰展宽,幅度按三角包络下降。特别是当雷达调频斜率改变时,常规移频产生的假目标在多个不同距离进行跳变,可被雷达准确识别。给出了一种改进的移频干扰方法:延时-变脉宽移频干扰,通过对接收信号进行延时变脉宽和倍乘调制,可实现干扰信号的产生不依赖于调频斜率。仿真实验表明,当雷达调频斜率改变时,延时-变脉宽移频干扰产生的假目标不随雷达调频斜率的改变而发生距离跳变现象。In LFM pulse compression radar,the coupling effect between time delay and frequency-shift is caused by the traditional fixed frequency-shift jamming,which results in the peak broadening and the amplitude envelope dropping according to triangle for the echo signal with frequency shift after the matched filter.Especially,when the frequency modulation slope is changed,the false target generated by conventional frequency-shift will hop between multiple distances and can be recognized by radar.For these problems,an improved method of frequency-shift jamming,the delay-variable pulse width frequency-shift jamming,is proposed.The method can realize the interference signal generation without depending on the frequency modulation slope by delay-variable pulse and multiplier modulation for the received signals.Simulation results show that the false target produced by the delay-variable pulse width frequency-shift jamming does not hop with the change of the frequency modulation slope.

关 键 词：线性调频 移频干扰 延时-变脉宽 调频斜率 

分 类 号：TN972[电子电信—信号与信息处理]