摘要近年来，我国铁路一直朝着高速化、网络化、业务多样化的趋势不断发展，也因此对铁路环境下的通信有着更高的要求。GSM-R铁路移动通信系统，作为目前各国铁路系统中使用最为广泛、最大程度上能够满足铁路通信业务要求的通信系统，已越来越成为关注和研究的对象。而对该系统规划和建设时所要面临的一系列难题，如保证高速铁路环境下通信传输的可靠性和稳定性以及频繁的越区切换所带来的通信连续性要求，都是设计与施工时所要考虑的重点问题。74903

本文主要根据高速铁路环境下的特点，对GSM-R网络结构、业务范围和该系统在高速环境的特点等几方面进行了介绍。并对其无线信道特征以及相关信道参数的定量计算进行了说明。

阐述了几种无线覆盖方式的特点，重点对其无线信号传输的频率分配问题进行了探讨。对三种无线冗余覆盖方式从可靠性、频率利用率、容灾能力以及工程造价等几方面进行了相互对比，从而在合适的环境下选取最为恰当的覆盖方式。

对不同环境下基站信号传输所面临的路径损耗问题进行研究，从而引出了应用最为广泛的路径损耗模型——Hata模型。根据该模型得出了不同环境下、不同基站高度产生的小区半径。并据此计算列车运行速度和重叠区长度之间的关系，并通过Matlab对其进行了仿真。另外还对基站间距的规划做出了说明。

以上研究内容都是GSM-R网络规划与设计时所要考虑的重点问题，因此，本文对该网络的建设提出了一些理论基础。

该论文有图19幅，表21个，参考文献33篇。

毕业论文关键词：GSM-R；无线覆盖方式；小区半径；重叠区长度；基站间距

Study of GSM-R Wireless Coverage Planning under High-speed Railway Environment

Abstract In recent years, the railways in our country have seen the trends of high speed, network and business persified and therefore the communication railway environment has higher requirements。 GSM-R, working as the communication system which has been most widely used in many countries and could satisfy the need of railway communication as possible, has gradually become the stuff to be noticed and researched。 However,when planning and constructing the system have to face a series of problems, such as to ensure the reliability and stability of high-speed railway communication transmission environment and frequent handoff communication brought continuity requirements, which are Key issues to be considered during the process of design and construction。 

According to the characteristics of high-speed railway environment, this paper mainly introduces GSM-R network structure, business scope and the characteristics of the system in the high-speed environment,etc。 It also introduces the radio channel characteristics and has quantitative calculation aiming to and parameters related to the channel。 Then it compares the loss in the process of signal transmission among different models。

It describes the characteristics of wireless coverage in several ways and mainly discusses its frequency assignment problem in wireless signal transmission。 Also, three wireless redundancy methods were compared with each other from the reliability, frequency utilization, disaster recovery capabilities, and project cost and other aspects, so as to select the most appropriate way to cover in the right environment。

It researches the issues that the path loss of base stations signal transmission under different environmental and then leads to the most widely used model --Hata path loss model。 According to the model it reached radius cells under different environment and different base  station height。 And calculates the relationship between the speed of the train and the length of the overlap regions, which are simulated using Matlab 。 Also the planned distance between the base stations has been described。