摘要
本文介绍了HHT时频分析方法及瞬时频率的概念,给出了已知信号的经验模态分解及其时频分布,并对实际地震波形信号进行了HHT时频处理与剖析。结果表明,HHT方法能准确描述地震波形信号的非线性时变特征,是地震信号时频分析的有效工具。
The time-frequency analysis method of Hilbert-Huang transform and conception of transient frequency are introduced,and the empirical mode decomposition and its time-frequency distribution about simulation and actual digital seismic waveform signals are given.The results indicate that the Hilbert-Huang transform can be used to describe the nonlinear and non-stationary characteristics of seismic signals at any moment and any frequency and is a strong tool of time-frequency analysis of seismic signals.
出处
《中国地震》
CSCD
北大核心
2005年第2期207-215,共9页
Earthquake Research in China
基金
类别]北京市自然科学基金项目(8041001)
地震科学联合基金项目(604022)
中国地震局三结合项目。
