EMD端点效应处理方法的研究

经验模态分解(EMD)过程中存在着端点效应问题,使得EMD分解结果产生严重的失真现象,从而导致处理数据发生畸变.提出了将极值点对称延拓和在信号序列上加窗函数相结合的方法,带入到EMD分解过程中,以抑制信号被分解时在端点附近所产生的上下包络线的发散现象.结果表明,该方法较好地解决了信号失真问题.

Study on the Method Dealing with the End Effect of EMD

Empirical mode decomposition (EMD) is a method to process the nonlinear or non-smooth data. But there is an involved end effect with it. The emergence of the effect makes the results of EMD decomposition have a serious distortion. In order to restrain the end effects of empirical mode decomposition, a method with combination of symmetrical extrema extension and window function multiplying in signal was proposed in this paper. This method was applied to harmonic analysis, and the simulation results show the effective ness of this method to restrain the end effects of Empirical Mode Decomposition.