FD—TD法分析埋地目标对基带脉冲波的电磁散射特性

A STUDY ABOUT EM SCATTERING OFBURIED OBJECTS ILLUMINATED BY BASEBANDPULSES USING FD-TD METHOD

本文利用FD—TD法分析了埋地目标对基带脉冲波的电磁散射问题.在推出有耗媒质中FD—TD法迭代公式和吸收边界条件的基础上,对基带脉冲波在有耗媒质中的传播特性和埋地目标的电磁散射特性分别进行了较为详细地讨论.给出了部分目标的回波堆积图,并对探地雷达的探测性能与媒质特性、目标特性的关系进行了分析.

The electromagnetic scattering by buried objects in lossy media is calculated using FD-TD method,The FD -TD formula and the absorbing boundary condition in lossy media are deduced, respectively. 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 baseband EM pulse in lossy media is studied in detail. The wiggle traces are given for several typical buried objects in order to better simulate an actual subsurface interface rcdar's results. The relationship between the resolution of the received pulses and the media and/or buried objects is discussed.