地震波信号频谱分析方法对比研究

Comparative Study on Spectral Analysis Method of Earthquake Wave Signal

基于川藏铁路某隧道采集的地震波信号,结合MATLAB信号处理工具,采用FFT分析法、CHIRP-Z变换分析法和PSD分析法分别对地震波信号频谱特征进行分析,根据分析结果研究这3种常用频谱分析方法的特征。研究结果表明,CHIRP-Z变换分析法对于地震波信号频谱分析效果最好,精确度最高;PSD分析法次之;FFT分析法效果最差。

Based on the seismic wave signal collected from a tunnel of Sichuan Tibet railway,combined with MATLAB signal processing tools,FFT analysis method,CHIRP-Z transformation analysis method and PSD analysis method are used to analyze the spectrum characteristics of seismic wave signal,and then according to the analysis results,studied characteristics of these three common spectrum analysis methods.The results show that the CHIRP-Z transform analysis method has the best effect and the highest accuracy for seismic wave signal spectrum analysis;PSD analysis method takes the second place;FFT analysis method has the worst effect.