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在宽角反射/折射地震测深数据处理中,仍多用基于傅里叶变换的滤波方法和小波去噪方法。鉴于傅里叶方法对稳态信号很有效但对非稳态的地震信号效果不佳的状况以及小波不能同时具有正交性、紧支性、对称性,本文给出了基于多小波的去噪方法,多小波具有正交性、对称性、紧支性,克服了传统小波的缺陷。编写了多小波去噪方法的人机交互软件。该软件可以方便快捷地显示宽角反射/折射地震记录截面,进行多小波域的阈值去噪。实例计算结果表明,本文所述方法和编写的软件有效且可行。
In wide-angle reflection / refraction seismic sounding data processing, the Fourier transform-based filtering method and the wavelet denoising method are still frequently used. In view of the fact that the Fourier method is effective for steady-state signals but not effective for unsteady seismic signals and the wavelet can not have orthogonality, compactness and symmetry at the same time, this paper presents a multi-wavelet-based denoising Methods, multiwavelets with orthogonality, symmetry, tight support, to overcome the traditional wavelet defects. Written multi-wavelet denoising method of human-computer interaction software. The software can quickly and easily display wide-angle reflection / refraction seismic recording cross-section, multi-wavelet domain threshold denoising. The calculation results of examples show that the method and software described in this paper are effective and feasible.