And based on the concept of time characteristic scale, a new approach to border processing named extension method based on boundary local characteristic scale is proposed. The approach improves better the impact of boundary effect on EMD.

• 1 对HHT采样频率、终止准则、曲线拟合、边界处理以及模态混叠等问题进行了分析,并基于HHT的时间特征尺度概念,提出了一种新的边界处理方法:边界局部特征尺度延拓法,较好地改善了边界效应对EMD分解的影响。