基于改进EMD算法的跳频信号参数估计  

A parameter estimation method of frequency-hopping signal based on improved EMD

作　　者：张黎烁[1] 王琦[2] 

机构地区：[1]河南工程学院,郑州451191 [2]河南财政税务高等专科学校,郑州451464

出　　处：《河南理工大学学报（自然科学版）》2014年第6期786-792,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：河南省基础与前沿技术研究计划项目(142300410130)

摘　　要：针对短时傅立叶变换时频分辨率不能同时很高,小波变换运算时间偏长,抗噪性差,Wigner-Ville变换及其改进方法受交叉项影响等问题,提出了一种基于希尔伯特-黄(HHT,Hilbert-Huang Transformation)算法的跳频信号参数估计.该方法的分解是自适应的,计算出的瞬时频率有很高的时间分辨率和较高频率分辨率.对于HHT算法中出现的虚假分量和端点效应问题,通过互相关方法来消除虚假分量,镜像闭合延拓方法去除端点效应.仿真结果表明该方法能很好解决上述两个问题.Because short term fourier transform did not have high time-frequency differentiability,wavelet transformation had too much operation time and Wigner-Ville distribution （including its improved methods） had cross-term interference.Thusly,a method called Hilbert-Huang Transform （HHT） was put up with to estimate the parameters of frequency-hopping signals.Its decomposition was adaptive and had high time differentiability and frequency differentiability,but it had end effects and illusive components.The end effects can be resolved by using a mirror closed extending method,and illusive components can be treated by using a correlation coefficient.Simulation results showed that this improved algorithm could solve the problems effectively.

关 键 词：参数估计 跳频信号 希尔伯特-黄变换 经验模态分解 

分 类 号：TN957[电子电信—信号与信息处理]