铁路长大隧道数字直放站拉远距离及切换区间距分析  

Analysis of Long-distance Extension of Digital Repeater and Spacing between Devices in Switching Zone of Long Railway Tunnel

作　　者：刘宁 赵留俊 葛伟涛 Liu Ning;Zhao Liujun;Ge Weitao(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁路通信信号工程技术》2022年第5期38-43,共6页Railway Signalling & Communication Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(P2021G012)。

摘　　要：铁路长大隧道的无线覆盖以基站拉远直放站的方式为主,但是直放站并不能无限制地拉远。同时,针对超长隧道场景,设置单套远端机时,1.5 km的间距不一定满足重叠区的要求。基于直放站的两种组网方式,针对GSM和直放站的特性以及漏缆和光缆的传播特性,通过公式推导给出远端机的理想拉远距离。结合链路预算,分析超长隧道直放站的单点故障下的解决方案,给出通用的切换区设备间距的建议。The wireless coverage of long railway tunnels is mainly by the way of extending the distance of repeater from the base station,however,the distance cannot be extended without limitation.At the same time,for the long railway tunnel scenario,when a single set of remote terminal is set up,the spacing of 1.5 km does not necessarily meet the requirements of the design specifications for overlapping area.In this paper,based on the two networking modes of repeater,aiming at the characteristics of GSM and the repeater as well as the propagation characteristics of leaky cables and optical cables,the ideal extended distance of the remote terminal is given through formula derivation.Based on the link budget analysis of the single-point fault solution of the repeater in the long railway tunnel,the general spacing between devices in the switching zone is proposed.

关 键 词：铁路长大隧道 数字直放站 拉远距离 切换区设备间距 

分 类 号：U285.21[交通运输工程—交通信息工程及控制]