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1、兰州交通大学毕业设计（论文）I摘要CBTC（Communication Based Train Control，基于通信的列车控制）系统利用连续、大容量的车地双向可靠数据通信来实现列车控制信息、列车状态信息的无线传输，是先进的列车自动控制系统。通过 CBTC 系统可以减小行车间隔，安全、高效、可靠地实现全方位、多功能的列车控制，而且即使在发生故障的情况下也可以采用备用模式安全运行，从而保证了行车安全，提高了铁路线路的利用率。DCS（Digital Communication System，数据通信系统）子系统实现车地之间双向、连续、高速、安全的信息交互，承载了直接关系到行车安全的重要数据信息，
2、是 CBTC 系统的核心。论文从 CBTC 系统和 DCS 系统的发展历程及系统构成入手，对 DCS 系统的轨旁有线骨干网络和车地无线通信网络两大模块进行了详细的阐述，对网络的组网方式、协议配置、功能以及设备的性能做了详细的描述。提出以采用 TCP/IP 协议的以太网为轨旁骨干网络、以 WLAN（Wireless LAN，无线局域网）为车地无线通信网络的数据传输系统作为 DCS 子系统的解决方案。论文对 DCS 系统可能受到的网络安全威胁从两方面进行了阐述，根据 DCS 系统的组网方式和协议结构，提出具有针对性的解决方案，并对与网络安全相关的频率规划和冗余设计做了简单说明。关键词：DCS，轨旁
3、骨干网络，车地通信网络，WLAN，安全传输，接入认证兰州交通大学毕业设计（论文）IIAbstractThe CBTC (Communication Based Train Control) system is an advanced train automatic control system which makes use of bi-directional, big-capacity digital communication between wayside and train, to transfer the information of the status of the train,
4、 as well as the controlling information. By using CBTC system, we can reduce the interval between trains achieving high round, multi-train control safely, efficient and reliably. Even in the case of failure, the standby mode may be used for safe operation. Thus, we ensure traffic safety so that impr
5、oving the utilization of the railway line. The core part of CBTC is DCS (Digital Communication System) subsystem, which achieve two-way, continuous, high-speed, secure information exchange between vehicles and destinations, carring important data information relavant to traffic safety directly.Start
6、ing from development process and system configuration of CBTC system and DCS system, I elaborated two modules including the wired sidings backbone network of DCS system and the wireless communication network between trains and destinations, the composition of the network, configuration requirements,
7、 function, and performance of the equipment. We propose a data transmission system, as a solution of DCS subsystem, adopting Ethernet based on TCP/IP protocol as terrestrial backbone network and WLAN (Wireless Local Area Net) as a wireless communication network.In the article, network security threa
8、ts that DCS system may suffer are described in two ways. According to networking and protocol structure of DCS systems, we propose targeted solutions, and give a brif introduction for frequency planning and redundant design relavant to network security.KEYWORDS: DCS, Trackside backbone network, Trai
9、n and terrestrial communications network, WLAN, Secure transmission, Access authentication兰州交通大学毕业设计（论文）III目录1. 绪论 .11.1 选题背景及意义 .11.2 基于通信的列车控制系统（CBTC） .11.2.1 CBTC 系统的出现 .11.2.2 CBTC 系统的结构 .21.3 数据传输子系统（DCS） .41.3.1 DCS 子系统的组成 .41.3.2 DCS 子系统的发展 .61.4 论文主要内容及章节安排 .62. DCS 系统网络 .82.1 轨旁骨干网络 .82.2 轨旁数据接入网络 .92.3 车载数据通信网络 .102.3.1 车载网络系统的组成 .102.3.2 IEEE 802.11 标准 .112.3.3 无线设备 .112.3.4 无线覆盖 .122.3.5 越区切换 .122.3.6 无线网络冗余 .122.3.7 无线抗干扰 .132.4 车地双向通信网络 .142.5 DCS 子系统对 WLAN 的要求 .162.6 DCS 子系统的性能 .172.6.1 网络的整体性能 .
