摘要
地震波是一种非平稳信号,傅立叶分析已不适合。时频分析能对非平稳信号进行分析,并给出地震波信号能量的时间-频率分布。但是在时频分析时,存在交叉干扰项,会带来一些错误的信息。本文讨论了波恩-约旦(Born-Jordan)时频分布、乔伊-威廉斯(Choi-Williams)时频分布、赵-阿特拉斯-马克斯(Zhao-Atlas-Marks)时频分布3者之间抑制和消除交叉干扰项的特点,认为赵-阿特拉斯-马克斯(Zhao-Atlas-Marks)时频分布抑制交叉干扰项的效果和时频聚集性更好,更适合于分析地震波。
Earthquake waveform signal is a kind of nonstationary signal, which can not be analyzed suitably by classical Fourier analysis. Time-frequency analysis can analyze nonstationary signal including earthquake signal. But the existence of cross distribution is inevitable. The characteristic of weakening the cross distribution of three kind of time-frequency presentation, which are Born-Jordan, Choi-Williams, Zhao-Atlas-Marks time-frequency presentation, is discussed in this article. In conclusion, Zhao-Atlas-Marks time-frequency presentation has weakest cross distribution, and is most suitable for analyzing earthquake waveform signal.
出处
《地震地磁观测与研究》
2006年第4期17-22,共6页
Seismological and Geomagnetic Observation and Research
关键词
非平稳信号
时频分布
数字化地震波
交叉干扰项
时变频谱
nonstatonary signal, time-frequency presentation, digital earthquake wave, crossdistribution
