小波域爬山拟合法消除面波

A fitting method via mountain climbing in wavelet domain and ground roll elimination

针对现行面波消除技术中傅氏变换的负作用、小波变换去噪中阈值不易准确求取及呈拟双曲线面波顶点及其局部区域面波无法消除问题,提出小波域爬山拟合法消除面波技术。该项技术利用经小波变换后的小波系数上面波特征更为突出的特点,采用爬山法搜索相邻道的相似波形,并求其均值,若该均值满足给定的三个面波判别准则,则从原始小波系数中减去,最后通过重构得到去除面波的记录。理论模型及实际资料处理结果表明:该方法克服了现有消除面波技术中存在的缺点,达到了较好的面波消除效果。

The present ground roll elimination methods have some negative effects in the Fourier transform,and that the threshold on wavelet transform is not precisely determined.So ground roll at hyperbolic top and nearly areas cannot be eliminated.For this propose,we present in the paper a fitting method based on mountain climbing to eliminate ground roll in wavelet domain.Using the wavelet coefficient characteristics from the wavelet transform,this approach searches similar waveform on adjacent traces and calculates the mean.The mean is subtracted from the original wavelet coefficients if it meets the three ground roll identification criterions.Ground roll is removed by wavelet reconstruction.Model and real data examples show that this approach eliminates ground rolls without the shortcomings of the existing ground roll elimination methods.