Study of three dimension high-order FDTD simulation for GPR
探地雷达三维高阶时域有限差分法模拟研究

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.