摘要
研究目的:基于无线局域网技术(WLAN)在城市轨道交通系统中的迅速发展,本文首先简单介绍并比较几个常用WLAN技术标准的不同特点,通过分析乘客信息系统(PIS)和信号基于通信的列车自动控制系统(CBTC)的车地无线网络组网结构及传输数据的特点,得出两个系统的网络带宽需求,并通过比较研究PIS和CBTC系统车地无线网络特点,探讨PIS与CBTC在地铁隧道环境下使用WLAN技术可能存在的相关问题。研究结论:根据对PIS车地无线网络系统的带宽分析,PIS只能采用802.11a或802.11g技术。当PIS系统采用802.11a技术标准时,两系统之间可避免干扰,并且接口简单,工程实施性较容易;采用802.11g技术标准时,PIS系统需与CBTC系统避让频点,增加了两系统在无线网络上的工程接口。同时,两系统的车地无线网络还应考虑其他无线网络的干扰。
Research purposes：With the rapid development of WLAN technology in subway,the characteristics of popular standards of WLAN technology are introduced in the article.The bandwidth requirement of passenger information system（PIS） and communication based train control（CBTC） system are deduced from the analysis of WLAN networking structure and the characteristics of data transmission.Other characteristics of PIS and CBTC wireless network are also analyzed.And possible problems of PIS and CBTC when WLAN is adopted in metro tunnel are discussed. Research conclusions：Based on the analysis of the bandwidth requirement of the PIS wireless network,only the 802.11a technology or 802.11g technology can be adopted in PIS.The interference between PIS and CBTC can be avoided when 802.11a technology is adopted in PIS,and the interface and implementation of project are easier.But when 802.11g technology is adopted in PIS,the frequency of PIS should be different from the frequency of CBTC,and the project interface is increased.Possible interference from other wireless network should be considered simultaneously.
出处
《铁道工程学报》
EI
北大核心
2011年第6期88-91,112,共5页
Journal of Railway Engineering Society
