改进预测反褶积抑制探地雷达多次波方法研究

Research on Improved Predictive Deconvolution to Suppress Ground Penetrating Radar Multiples

为了避免探地雷达(GPR)在地质勘测中因反射而产生的多次波干扰影响后续的地质解释,需要对多次波进行检测和抑制。针对常见的双曲线反射信号,依据一次波和多次波的形状,通过定位多次波位置,拟合双曲线回波,利用双曲线拟合函数自动控制预测反褶积参数,最后通过反褶积实现了多次波的预测与去除。为测试算法效果,拟定多次波与弱目标回波位置高度重叠且多次波强度与弱目标强度相近的场景,有效去除多次波干扰并尽可能保留弱目标。与传统的预测反褶积处理相比,改进后的方法不仅能将多次波干扰抑制得更彻底,而且还能更好的凸显弱目标的回波。

In order to avoid the multiple wave interference caused by the reflection of Ground Penetrating Radar(GPR)in geological exploration from affecting subsequent geological interpretation,it needs to be detected and sup⁃pressed.For common hyperbolic reflection signals,according to the shape of the primary and multiple waves,by loca⁃ting the position of the multiple waves,and fitting the hyperbolic echo,the hyperbolic fitting function was used to auto⁃matically control the prediction deconvolution parameters.Finally,improved predictive deconvolution had been em⁃ployed to remove the multiple waves.In order to test the proposed algorithm,a scene was employed where the echo positions of the multiples and the weak target were highly overlapping and the strength of the multiples was similar to that of the weak target.In the experiment,the interference caused by the multiple waves was effectively removed and the weak target was retained as much as possible.Compared with the traditional prediction deconvolution processing,the proposed improved prediction deconvolution method can not only suppress the multiple wave interference more thoroughly,but also the echoes of weak targets have been better highlighted.