限幅失真对线性调频脉冲压缩的影响  

Effect of Amplitude Limit Distortion on Pulse Compression of LFM Signals

作　　者：赵强[1] 林强[2] 王红[2] 刘洋[1] 

机构地区：[1]空军预警学院研究生管理大队,湖北武汉430019 [2]空军预警学院,湖北武汉430019

出　　处：《雷达科学与技术》2014年第2期176-180,共5页Radar Science and Technology

摘　　要：针对探测目标处于强点杂波干扰环境时,对因限幅失真而引起的线性调频(LFM)信号脉冲压缩输出波形的影响进行了理论分析与仿真。仿真结果表明:限幅失真对脉压输出波形的主要影响是在时域形成了与目标信号具有相同多普勒特性但幅度始终小于目标信号幅度的镜像回波,易造成信号检测时虚警率的升高;限幅比例、信杂比以及信号重叠度对因限幅失真而产生的镜像回波均有不同程度的影响。并且提出了一种解决因镜像回波的出现而使虚警率升高这一问题的方法。The effect of amplitude limit distortion on the output wave of pulse compression of LFM sig-nals is analyzed by theoretical and simulation research for the target under heavy point clutter environment. The simulation results show that the main effect of amplitude limit distortion is that a mirror echo signal en-genders in time domain,which has the same Doppler properties as the target signal.It results in higher false alarm rate.The proportion of amplitude limit,SCR and the proportion of signal overlap have the influences on the mirror echo signal in different degrees.This paper puts forward a solution to the problem rerulted from the mirror echo signal.

关 键 词：限幅失真 线性调频 脉冲压缩 镜像回波 

分 类 号：TN958.3[电子电信—信号与信息处理]