To evaluate accurately the ability of radar in evaporation duct environments , a method is proposed which is combined the electromagnetic waves propagation numerical equation with the theories of radar receiver 该文主要针对如何准确评估蒸发波导环境下雷达的探测能力问题，利用电磁波传播的数值方程并结合雷达接收机理论，构建了雷达探测定量评估的模型和方法。
Early in the process of marking out network , mobile communication corporations need to avoid the existence of no - signal areas in order to provide good services , so the study of propagation prediction in regions became an important task 早期移动通信运营商在规划网络过程中，需要消除信号盲区的存在，因此研究区域环境内电磁波传播特性就成为一个重要课题。
Chapter 4 introduces the applications of the fdtd method . radiated - transmission approach is used to analyze the properties of the ultra - wide band electromagnetic propagation . this chapter presents the effect of the media on the electromagnetic propagation with different electromagnetic parameters and different configurations , and the results agree well with those of the measurements 然后第四章介绍了时域有限差分法( fdtd )的应用：运用辐射传输模型研究了超宽带电磁脉冲在混凝土墙中的传播特性，给出了不同电参数及不同结构下介质对电磁波传播的影响并与实际测量结果进行了对比，获得了较好的一致性。
According to practice of transient electromagnetic operators , this paper will introduce a new multi - aperture transient electromagnetic method integrating a lot of simulation experiment data on the base of its primary theory and transmission rule . in the end , result shows this new method can improve so much direction of electromagnetic field that it increases lognitudinal resolving power 本论文根据瞬变电磁法勘探工作者的实践，利用电磁波运动学特征在讨论其基本原理和电磁波传播规律的基础上，结合在论文过程中进行的大量模拟实验资料，进一步引入了多孔径瞬变电磁发射场源，实验结果分析证明采用瞬变电磁多孔径发射场源改善了辐射场的方向性，提高了瞬变电磁法勘探的垂向分辨力。
Finally in chapter 6 , the problems of boundary conditions and incident wave , as the most valuable problem of mrtd as a time - domain method , are studied . this chapter presents the simulation results of the electromagnetic propagation and its interactions with the dielectric slab and analyse of the graph of the reflection coefficient in frequency . compared with fdtd results , the numerical results , obtained using the mrtd method , show the directness and conciseness of mrtd as a time - domain method and the advantages in grid enlargement and saving computer resource etc . 最后，第六章讨论了mrtd作为时域数值技术最具实际应用价值的边界条件设置和入射波加入等问题，并给出模拟电磁波传播过程和介质板反射系数频谱分析，其数值结果表明了mrtd作为时域方法的直观简练，与fdtd方法的结果比较，显示了其在扩大网格、节省计算资源等方面的优势。
