基于射线跟踪法的丘陵地区的电波传播特性的研究

发布时间：2018-03-05 00:17

本文选题：电波传播　切入点：射线追踪　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：丘陵作为陆地五大地貌之一,在我国有着广泛的分布,因此研究丘陵环境下的电波传播特性对于丘陵地区无线通信网络的设计与规划有着重要的意义。丘陵地区不规则的地形地貌使得以往对于丘陵地区的电波传播特性的研究基本采用实地测量和经验模型预测的方法,往往费时费力,且随着无线移动通信的发展,无论从效率还是精度上来说已远不能达到实际网络规划的要求。本文旨在运用射线跟踪方法以及地理信息技术,以建立丘陵环境下的电波传播确定性模型,以研究丘陵环境下不规则的地形地貌对于电波传播特性的影响。本文主要研究内容为:(1)制作了所研究丘陵区域的电子地图,建立对应的DEM高程模型。以电子地图作为数据源,在VB环境下利用Mapobjects(MO)组件式开发工具建立地理信息系统。通过对地图数据的分析与处理,由插值算法分析路径剖面的原始数据,可以计算出发送端与接收端的剖面函数,根据该函数建立收发端的确定性研究模型。(2)对路径剖面函数进行劈型近似化处理。运用射线跟踪方法中的镜像法对近似后的路径剖面进行分析,讨论了直射射线、反射射线、绕射射线以及混合模式射线模块的主要算法流程。并结合几何绕射理论以及一致性劈绕射理论的相关计算方法完成了相关无线信道参数的求解。(3)在Matlab和VB环境下对该射线跟踪模型进行仿真,研究了不同接收天线高度下,不规则地形对于电波传播路径损耗的影响,并将仿真结果与前人文献中的实验数据以及经验模型下的预测结果进行对比,验证了该模型的正确性与准确性。最后根据部分路径的仿真结果,研究了地面电参数对于电波传播路径损耗预测结果的影响,对该模型做出了一些改进。
[Abstract]:As one of the five landforms, hills are widely distributed in China. Therefore, it is of great significance to study the characteristics of radio wave propagation in hilly environment for the design and planning of wireless communication network in hilly region. The irregular topography in hilly area makes the radio wave propagation special for hilly area in the past. The methods of field measurement and empirical model prediction are basically used in the study of sex. It is often time-consuming and laborious, and with the development of wireless mobile communication, it is far from meeting the requirements of actual network planning in terms of efficiency and precision. In order to establish a deterministic model of radio wave propagation in hilly environment and to study the influence of irregular topography and geomorphology on the characteristics of radio wave propagation in hilly environment, this paper makes an electronic map of the studied hilly region. The corresponding DEM elevation model is established. With the electronic map as the data source, the GIS is established by using the MapobjectsMO-based development tool in VB environment. Through the analysis and processing of the map data, the original data of the path profile are analyzed by the interpolation algorithm. The profile functions of the sender and receiver can be calculated, According to this function, the deterministic research model of the transceiver is established. The path profile function is treated by splitting approximation. The image image method of ray tracing method is used to analyze the approximate path profile, and the direct ray and reflection ray are discussed. The main algorithm flow of diffraction ray and mixed mode ray module. Combining with geometric diffraction theory and consistent split diffraction theory, the relevant wireless channel parameters are solved in Matlab and VB environment. The ray tracking model is simulated. In this paper, the influence of irregular terrain on the propagation path loss under different receiving antenna heights is studied, and the simulation results are compared with the experimental data and the prediction results under the empirical model. The correctness and accuracy of the model are verified. Finally, based on the simulation results of some paths, the influence of ground electrical parameters on the prediction results of propagation path loss is studied, and some improvements are made to the model.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN011

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