摘要
针对目前广泛应用于城市轨道交通信号系统中,基于IEEE802.11系列标准的两种WLAN传输方式——空间自由波和波导管.简要分析两种传输方式的工程和技术特点.深入分析WLAN射频覆盖和通信机制.结合北京轨道交通亦庄、昌平线组合传输方法的应用实例,提出空间自由波和波导管进行组合的组合传输无线覆盖方式,并简要介绍车地无线通信系统的系统结构和工作方式,无线AP的性能特点和分布原则.计算WLAN自由空间损耗、信号接收强度、链路系统裕量.提出WLAN技术在信号系统车地通信中应用的前景.
In this paper,the IEEE802.11 series-based WLAN transmission modes are proposed： space free wave and waveguide,which have been widely used in urban rail transit signal system.The engineering characteristics and technical features of these two modes are briefly introduced,and the WLAN radio frequency coverage and communication mechanism are deeply analyzed.Baesd on the implementation in subway lines Yizhuang and Changping,the wireless coverage of space free wave and waveguide combination transmission are documented,as well as the structure and working mode of train-ground communication system,the performance characteristics and distribution principle of the wireless AP.The calculation of the WLAN free space loss,signal accept strength and link system allowance are also presented.The development direction of WLAN in the signal system is proposed.
出处
《交通运输系统工程与信息》
EI
CSCD
2011年第4期55-60,共6页
Journal of Transportation Systems Engineering and Information Technology
关键词
城市交通
轨道交通
组合传输
车地通信
无线局域网(WLAN)
无线接入点(AP)
urban traffic
rail transit
combination transmission
train-ground communication
wireless local area networks（WLAN）
wireless access points
