Study of three dimension high-order FDTD simulation for GPR
Study of three dimension high-order FDTD simulation for GPR
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发表时间：
2010
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通讯作者：
Zeng Zhao
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作者：
Zeng Zhao
时域有限差分法（FDTD）通常采用二阶精度的中心差分近似时域有限差分法（FDTD（2，2））在探地雷达（GPR）数值模拟中，由于数值频散误差的存在，复杂模型的响应不是很清晰，高阶时域有限差分法（HO-FDTD）是一种基于高阶有限差分法（HO-FDTD）的数值计算方法，基于HO-FDTD方法的基本原理，采用单轴各向异性完全匹配层（UPML）对三维探地雷达数据进行了数值模拟作为吸收边界，它能有效地吸收边界处的电磁波反射，大大提高计算效率。通过对正演模拟结果的分析比较，FDTD仿真可以得到目标准确的电磁响应信息，提高仿真精度。
The finite-difference time-domain (FDTD) method usually uses the second order accuracy central difference approximation (FDTD(2,2)) in time and space in numerical simulation of ground-penetrating radar (GPR).Because of numerical dispersion error, the response of complex model is not very clear, especially for fine structures.The high-order finite-difference time-domain method (HO-FDTD) is efficient in improving accuracy and reducing the error caused by numerical dispersion.We simulate three-dimensional GPR data based on the basic principles of HO-FDTD method using the uniaxial anisotropic perfectly matched layer (UPML) as absorbing boundary.It can effectively absorb the electromagnetic waves reflection at boundary and greatly increase the computational efficiency.Three dimensional HO-FDTD simulation can get accurate electromagnetic response information for target and improve simulation accuracy by analyzing and comparing the results of forward modeling.