时域有限差分法(FDTD)模拟探地雷达极化测量

The Simulation of GPR Polarization Measurement with Finite-Difference Time-Domain(FDTD) Method

由于探地雷达偶极天线具有电磁极化特性,其发射天线主要发射沿着天线长轴方向的线性极化波,而接收天线对这种极化方向的电磁波也最灵敏。因此,在对混凝土中钢筋、电缆等目标体进行检测时,利用天线的极化特性可以了解目标体的延伸。时域有限差分法是麦克斯韦方程的直接时域法,其计算简单、直观、灵活性强、计算精度高、动态范围大。利用时域有限差分法(FDTD)对地质雷达极化测量进行了正演模拟,取得了很好的效果。

Based on the electromagnetic polarity character of the GPR dipole antenna,the transmitter produces an electric field with a polarization paralleled to the long axis of the antenna,the receiver is most sensitive to such kind of polarized waves.Therefore,we can explain the orientation of the rebar、cable and other targets in the concrete without overwork.Finite-difference time-domain(FDTD) is a direct time-domain method of Maxwell equation which is sample,visual,flexible and have a large dynamic range in calcu...