摘要
本文用时域有限差分法(FD-TD法)计算了浅层地下目标的时域电磁散射。在地下色散媒质的参数ε_r(ω)和μ_r(ω)都是以Debye方程表示时,推出了FD-TD法的迭代分式,并给出了相应的吸收边界条件。通过将FD-TD法计算的结果与其它结果相比较,证实了该方法对计算有耗媒质中电磁场问题的有效性。对瞬态脉冲在色散媒质中的传播特性进行了讨论。分别计算了典型地下目标的时域散射波形和波形堆积图。
The time-domain Electromagnetic(EM) scattering by buried objects in dispersive media is calculated by using FD-TD method. The FD-TD formula in Debye dispersive media(both the complex permeability and the complex permittivity are described by Debye equations) are deduced, and the absorbing boundary condition is given. The validity of FD-TD method in lossy media is verified through comparing the FD-TD's result and other one. The propagation of transient pulses in dispersive media is studied in detail. The scattering pulses and the wiggle traces for typical buried objects are given.
关键词
时域有限差分法
色散媒质
电磁散射
FD-TD method, Dispersive media, Buried objects, Transient pulse, Electromagnetic scattering
