隧道场景列车车体对无线电波传播的影响  

Influence of Train Body on Radio Wave Propagation in Tunnel Scene

作　　者：陶成[1] 张春圆 周涛[1,2] 张文良 TAO Cheng;ZHANG Chunyuan;ZHOU Tao;ZHANG Wenliang(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing Jiangsu 210096,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《中国铁道科学》2019年第4期86-94,共9页China Railway Science

基　　金：国家自然科学基金资助项目(61701017);北京市自然科学基金资助项目(4174102);东南大学移动通信国家重点实验室开放研究基金资助课题(2018D11);中央高校基本科研业务费专项资金资助项目(2018JBM003)

摘　　要：应用射线跟踪法,仿真对比地铁隧道场景中列车车体加入前后采用直接覆盖和中继覆盖2种通信方式、1.4和38.0GHz 2种通信载频,以及收发天线不同位置时无线电波传播特性的变化情况。结果表明:采用直接覆盖的通信方式,无线电波在穿越车体时会产生严重的穿透损耗,均方根时延扩展明显增大;采用中继覆盖的通信方式,列车车体的存在对2种载频情况下的路径损耗结果影响不明显,但对均方根时延扩展结果影响会有较大不同;在隧道内有列车的情况下,载频为1.4GHz时,收发天线分别设置在车头中部和隧道墙边位置路径损耗最小,均方根时延扩展亦不大,而载频为38.0GHz时,发射天线设置在隧道顶部或者墙边效果较好,接收天线设置在车头中部位置时,路径损耗和均方根时延扩展均最小。The ray tracing method was used to simulate and compare the two communication modes of direct coverage and relay coverage in two different communication carrier frequencies of 1.4 and 38.0 GHz before and after adding the train body to the subway tunnel scene,and the changes of radio wave propagation characteristics under different positions of transmitting and receiving antennas.Results show that,with the direct coverage communication mode,radio waves will generate severe penetration loss when passing through the train body,and the root mean square delay spread will increase significantly.With the relay coverage communication mode,the influence of the train body on the results of path loss under two different carrier frequencies can be omitted,but the influence on the results of root mean square delay spread is obvious.In the case of a train in the tunnel under the carrier frequency of 1.4 GHz,when the transmitting and receiving antennas are located in the central part of the locomotive and at the side of the tunnel wall,the minimum path loss and small root mean square delay spread can be acquired.When the carrier frequency is 38.0 GHz,the effect of transmitting antenna is better at the top or the side of the tunnel.When the receiving antenna is located in the central part of the locomotive,both the path loss and root mean square delay spread are the smallest.

关 键 词：地铁隧道 无线通信系统 射线跟踪法 通信载频 天线位置 路径损耗 时延扩展 

分 类 号：TN92[电子电信—通信与信息系统] U451[电子电信—信息与通信工程]