【摘要】 Hilbert-Huang变换是处理非平稳信号的时频分析新方法,包括经验模态分解(EMD)和Hilbert变换两部分。根据面波主要存在于低频分量中的特点,首先去除只含面波的IMF分量,然后对同时包含面波和有效波的IMF分量进行Hilbert变换,在其时频平面中的位置(即时频通域)设计时频滤波器进行面波去除,最后把去除面波后的低频分量和只包含有效波的分量进行Hilbert-Huang反变换,得到去除面波后的地震记录。实际资料应用结果表明,该方法可以较好地压制面波,有效信号损失较少。更多还原

【Abstract】 Hilbert-Huang transform is a new time-frequency method to process non-stationary signal,including empirical mode decomposition(EMD) and Hilbert transform.Surface wave mainly distributes in the low frequency components,so IMF component which merely contains surface wave was removed firstly.Then as for IMF component containing surface wave and effective wave,we processed them with Hilbert transform.In the time-frequency(TF) pass domain,we designed TF filter to remove surface wave.Finally,we carried out Hilbert-Huang inverse transform on the seismic record without surface wave after suppressing low-frequency components of surface wave and other components merely containing effective wave based on Hilbert-Huang inverse transform.The results based on actual seismic data indicate that this method can suppress surface waves effectively with less effective signal loss.更多还原