FD－TD法分析频变煤质中基带脉冲波传播和散射  

A Study About the Propagation and EM Scattering of Baseband Pulse in Frequency-Dependent Media by FD-TD Method

作　　者：方广有[1] 张忠治[1] 汪文秉[1] 

机构地区：[1]中国电波传播研究所,西安交通大学信控系

出　　处：《电波科学学报》1994年第4期8-16,共9页Chinese Journal of Radio Science

摘　　要：利用ＦＤ－ＴＤ法，分别计算了频变媒质中基带脉冲淡的传播和浅层地下目标的时域电磁散射问题。通过Ｚ－变换技术，推出了媒质的介电常数εｒ＜（ω）和导磁率μｒ（ω）同时用Ｄｅｂｙｅ方程表示时ＦＤ－ＴＤ法的迭代公式，并给出了相应的吸收边界条件。通过将计算结果与其它结果相比较，证实了ＦＤ－ＴＤ法分析有托媒质中电磁场问题的有效性，并比较了吸收边界条件的吸收性能。对基带脉冲波在不同频变媒质中的传播特性进行了讨论。分别计算并给出了位于频变媒质中典型目标的时域散射波形和波形堆积图。The propagation and Electromagnetic (EM ) scattehng of baseband pulse in frequency- dependent media are calculated by 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 through Z--transforms. The validity of AD-TD method in boy media is verified by comparing the FD--TD results with other ones. Three absorbing boundary conditions in disperaive media are compared. The propagation of transient baseband EM pulse in different dispersive media is discussed in detail. The EM scattering curves and the wiggle traces are given for several typical subsurface anomalies.

关 键 词：FD-TD法 频变媒质 基带脉冲 脉冲波传播 散射 

分 类 号：TN011[电子电信—物理电子学]