一种多LFM信号检测与参数估计的方法  

A Detection and Parameter Estimation Method of Multiple LFM Signals

作　　者：田由甲[1] 王巍 

机构地区：[1]中国电子科技集团公司第54研究所,石家庄050081 [2]火箭军参谋部训练局,北京100085

出　　处：《舰船电子对抗》2016年第3期45-48,共4页Shipboard Electronic Countermeasure

基　　金：河北省科技基金;项目编号:14040322Z

摘　　要：针对常规方法对多个线性调频(LFM)信号进行处理时存在运算量大、不能满足快速检测和交叉干扰的问题,分析了采用分数阶傅里叶变换(FrFT)对LFM信号进行参数估计的原理,基于快速解线性调频技术,将LFM信号检测与参数估计由二维搜索转换为2个一维搜索。该方法可以有效减小运算量,易于工程实现。仿真结果表明,此方法在低信噪比下仍具有良好的性能。Aiming at the problems that the operational quantity is large,the rapid detection can＇t be realized,and the cross-interference can＇t be solved when the multiple linear frequency modulation（LFM）signals are processed by general methods,this paper analyzes the theory using fraction rank Fourier transform（FrFT）to estimate the parameters of LFM signal,transforms the detection and parameter estimation of LFM signals from one two-dimension searching to two one-dimension searching based on fast dechirp technology.This method can effectively decrease the calculation quantity,and is easy to be realized.Simulation result shows that the method has good performance under the condition of low signal to noise ratio.

关 键 词：分数阶傅里叶变换 线性调频信号 信号检测 参数估计 

分 类 号：TN957.51[电子电信—信号与信息处理]