基于小波变换的高分辨率地震信号瞬时参数提取方法

The Research of Extract Method of High Resolution Seismic Signal's Instantaneous Parameters Based on Wavelet Transform

小波变换在时域以及频域具有良好的局域化特征,可用来实现对地震信号瞬时振幅、相位、频率等瞬时参数的提取。由于小波变换具有去噪的功能和分频处理的特点,在小波域提取的瞬时特征具有很好的抗噪性和可靠性。对小波变换提取地震信号瞬时参数的方法进行改进,通过对地震信号求导来增加其主频,对求导后的地震信号进行小波变换,从而得到高分辨率地震信号的瞬时参数。

Wavelet transform have good localization in time domain and frequency domain,it can be used to extract the instantaneous amplitude,the instantaneous phase,the instantaneous frequency of the seismic signals.Instantaneous parameters extracted in the wavelet domain have good noise immunity and good reliability,because the wavelet transform own the characteristics of frequency division and the function of noise removed.The method is improved that extraction method of the seismic signal＇s instantaneous parameters based on wavelet transform,it can get high resolution instantaneous parameters through calculating the derivative of the seismic signals to increase the dominant frequency and then to make wavelet transform to the seismic signals worked.