【摘要】 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。更多还原

【Abstract】 From Maxwell′s equation,using convolutional perfect matched layer(CPML) as the absorbing boundary condition,the FDTD iterative formula is deduced,and several kinds of simple two-dimensional geoelectric profile are obtained by simulation based on ultra-wideband signal.It approximately reflects the position of anomaly in original model.F-K offset method is used to deal with the forward profiles.By comparing profiles before and after the offset processing,it shows that F-K offset method can make the reflection wave return to original position,and make the diffraction wave converge.The resolution of profiles can be enhanced greatly.Through the combination of forward modeling and offset processing,it has laid a good theoretical foundation for target identification and geological interpretation with ultra-wideband ground penetrating radar in the future.更多还原