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从麦克斯韦方程出发,推导了以CPML作为吸收边界条件的FDTD迭代公式,并以超宽带雷克子波作为发射源,模拟得到了简单二维地电剖面,粗略反映了地下异常体的位置;采用F-K偏移方法对正演剖面进行了处理,通过对比处理前后的剖面可以看出,处理后的剖面反射波得到了归位,绕射波得到了收敛,提高了对正演剖面的分辨率。正演模拟与偏移处理的结合,为今后利用超宽带探地雷达进行地下目标探测及识别打下了良好的理论基础。
Based on the Maxwell equation, the FDTD iterative formula with CPML as the absorption boundary condition is deduced and a simple two-dimensional (2D) geoelectric profile is simulated by using ultra-wideband Ricker wavelet as a source of emission. The FK Offset method is used to deal with the forward profile. By comparing the profiles before and after processing, it can be seen that the processed profile reflected wave is returned and the diffraction wave converges, which improves the resolution of the forward profile. The combination of forward modeling and offset processing laid a good theoretical foundation for the future detection and identification of underground targets using ultra-wideband ground penetrating radar.