探地雷达单轴各向异性介质正演模拟及偏移成像

Forward simulation and inversion imaging of uniaxial anisotropic media using ground penetrating radar

针对介质各向异性条件下探地雷达成像分辨率不高的问题,采用各向异性条件下的FDTD正演公式,对单轴各向异性介质模型进行正演模拟计算,然后对模型数据进行克希霍夫偏移成像。通过对比偏移处理前后的剖面,采用偏移处理后,剖面中的地下界面、异常特征得到了很好的收敛归位效果,大大提高了探地雷达成像的分辨率,对实测数据的处理结果亦验证了该方法的正确性。

For obtaining accurate imaging of ground penetration radar under condition of uniaxial anisotropic media, on the basis of FDTD forward formula under uniaxial anisotropy, the forward simulation of uniaxial anisotropic media is carried out, and then the model data is processed by Kirchhoff migration imaging. Through comparing section plane before and after migration treatment, it is discovered that the underground interface in section and abnormal points are treated with satisfactory convergence effect by using migration image and the resolution ratio of ground penetrating radar imaging is improved greatly. The treatment effect for practical project also proved the effectiveness of the proposed method.