地震地磁观测与研究2016，Vol.37Issue(1)：15-21,7.DOI:10.3969/j.issn.1003-3246.2016.01.003
STFT与WVD在地震波时频分析中的应用
Application of short-time Fourier transform and Wigner-Ville distribution in time-frequency analysis of seismic wave
摘要
Abstract
Seismic signal is a kind of non-stable signal,which can’t be analyzed suitably by classical Fourier analysis. Time-frequency analysis can analyze non-stationary signal in time-frequency domain and show out the distribution characteristics. WVD has perfect time-frequency concentration,but because it is a bilinear transformation,the existence of cross-terms is inevitable. STFT is linear transformation,has no cross-terms,but affected by the window size, it has bad time-frequency concentration. Based on the advantage of these two methods,we propose to obtain the time-frequency distribution by the combined method. This method can suppress the cross-term interference in WVD effectively,while keeping the excellent time-frequency concentration. By calculating simulation signal and actual data,the comparison result of STFT,WVD and the combined method indicates that the combination method is most suitable for computing the time-frequency distribution characteristics of earthquake waveform signal and more effective to detect the arrive time of P-waves.关键词
短时傅里叶变换/Wigner-Ville分布/时频分析/地震波谱Key words
short-time Fourier transform(STFT)/Wigner-Ville distribution(WVD)/time-frequency analysis/earthquake spectrum引用本文复制引用
刘希康,丁志峰,李媛,崔仁胜..STFT与WVD在地震波时频分析中的应用[J].地震地磁观测与研究,2016,37(1):15-21,7.基金项目
中国地震局“三结合”（No.163303），科技部公益性行业科研专项“中国地震科学台阵探测--南北地震带北段”（No.201308011），中国地震局第一监测中心主任基金项目 （）
