一种自适应的EMD端点延拓方法  

A Self-Adaptive Method Dealing with the End Issue of EMD

作　　者：邵晨曦[1] 王剑[1] 范金锋[1] 杨明[2] 王子才[2] 

机构地区：[1]中国科学技术大学多媒体计算与通信教育部-微软重点实验室 [2]哈尔滨工业大学控制与仿真中心,黑龙江哈尔滨150001

出　　处：《电子学报》2007年第10期1944-1948,共5页Acta Electronica Sinica

基　　金：国家自然科学基金重点项目(No.60434010);安徽省国际合作项目(No.06088023);多媒体计算与通信教育部-微软重点实验室科研基金(No.06120803)

摘　　要：由美国国家航空航天局(NASA)的Huang等发明的经验模态分解(EMD)是一种先进的信号处理方法,能够有效地获得非平稳信号的时频特征,但是其利用样条曲线构造信号上下包络线的过程中存在严重的端点问题.在研究了该问题已有方法的基础上,提出了一种基于波形匹配的自适应端点延拓方法,采用信号内部和端点处变化趋势最为相似的子波来对端点处的信号进行延拓.该方法充分考虑了信号的内在特性以及边缘处的变化趋势,使端点处的延拓更加合理,从而使得三次样条曲线在端点处不会发生大的摆动.实验表明该方法能够有效地抑制端点效应.The Empirical Mode Decomposition （EMD） developed by Huang etc, of NASA is an advanced method for signal analysis. But there is an involved end issue in the course of getting two envelops of the data using spline interpolation. In this paper, a new self-adaptive method to dealing with the end issue is proposed. Generally, it extends the extrema sequence near the ends of the data by the most suited sequence in the inner data,For the chosen inner sequence has the most similarity of tendency with the ends, the data extension is reasonable. After the extension, the spline does not swing at both ends of the data, The result of experiment proved that the new method can be used to solve the end issue effectively.

关 键 词：经验模态分解 端点效应 自适应方法 

分 类 号：TN911.7[电子电信—通信与信息系统]