基于Morlet小波在雷达信号脉内特征提取中的应用  

Application of modified Morlet wavelet in feature extraction of radar signal to intra-pulse

作　　者：易丽[1] 何怡刚[1] 方葛丰[1,2] 樊晓腾[1,2] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]中国电子科技集团公司第41研究所电子测试技术国防科技重点实验室,山东青岛266555

出　　处：《计算机应用研究》2013年第1期172-175,共4页Application Research of Computers

基　　金：国家杰出青年科学基金资助项目(50925727);国家自然科学基金资助项目(60876022);湖南省科技计划项目(2011J4;2011jk2023);国防预研重大项目(C1120110004);广东省教育部产学研计划资助项目(2009B090300196);中央高校基本科研业务费计划资助项目

摘　　要：为识别雷达信号不同调制方式,可通过准确估计雷达信号瞬时频率来分析信号脉内特征。通过分析小波脊线原理和Morlet小波各种参数对提取调制雷达信号小波脊线特征的影响,提出改进Morlet小波原子。针对不同调制类型雷达信号,分析了正确提取信号脊线特征的条件。提出一种基于改进Morlet小波的小波脊线方法估计雷达信号的瞬时频率。通过仿真实验表明,与普通Morlet小波相比,基于改进Morlet小波在提取信号脊线特征时精确度和抗噪性得到提高。In order to recognize different modulation methods of radar signals,estimating accurately the radar signal of the instantaneous frequency to analysis the signal＇s intra-pulse characteristics.By analyzing the wavelet-ridge theory and the affect of various parameters of the Morlet wavelet to extract the modulated radar signal wavelet-ridge characteristics,this paper proposed a modified Morlet wavelet.Then according to different modulation type of radar signals,it analyzed the correct conditions of wavelet-ridge features extraction,and proposed a method which called wavelet-ridge,it based on modified Morlet wavelet and could estimate instantaneous frequency of the radar signal.Simulation results show that,compared with common Morlet wavelet,based on the improved Morlet wavelet-ridge extract signal features have better precision and less noise.

关 键 词：瞬时频率 小波脊线 MORLET小波 雷达调制信号 

分 类 号：TN911.7[电子电信—通信与信息系统]