基于传输线法模拟探地雷达在多层介质模型中的传播

Numerical simulation of GPR wave propagation in multi-layered medium using transmission line method

数值模拟是研究探地雷达电磁波在多层介质中传播规律的有效手段,传输线算法是一种基于Huygens原理的时域分析电磁场方法。这里阐述了TLM方法的基本原理及基本关系式,用TLM方法对多层介质进行了正演模拟,将模拟结果与FDTD方法合成结果进行了对比,结果表明了TLM用于GPR正演计算的正确性及有效性。应用该算法对已有模型进行了定性分析,验证了随着介电常数和电导率增大,雷达电磁波衰减加快的结论。

Numerical simulation is an effective measure for the research on GPR wave propagation in muhi layered medium. Transmission line method （TLM） is a numerical computing method for the time domain electromagnetic filed which based on the Huygens＇ principle. This paper gives the fundamental principles and nodes relationships of TLM. A forward simulation for the muhi layered based on the TLM. Comparison of the numerical results is made between TLM and FDTD, it can be foundthat the correctness and effectiveness of the TLM used for GPR forward computation. Simulations to the existing model, the results shows that the increasing conductivity and permittivity with the increasing attenuation of electromagnetic wave.