射频信号在电气化铁路隧道中的传输分析及应用

分析了射频信号沿电气化铁路隧道的传播。基于隧道壁的特性以及接触网和轨道的存在，对于应用频率、传输模式、场的表示给出了符合实际的分析。结合设计与研制的电气化铁路接触网施工安全防护用便携射频收发机在宝（宝鸡）－成（成都)铁路沿线长期应用与测试，给出了在汇龙场隧道射频传输的实际效果。研究表明，电气化铁路隧道是语音和低速数字信号传输的有效信道。

Analysis and Application of RF Transmission in Electric Railway Tunnels

RF transmission in electric railway tunnels is studied based on the characteristics of the tunnel walls and the fact that there are catenary and rails as paths of signals. The RF frequency, its propagation mode and the calculation of the electric field are analyzed. As an example, application of the radio transmitters designed for communication in a mountainous section in Baoji-Chengdu railway is presented. It is shown that an electrified railway tunnel is an effective channel for transmission of language and slow digital signals.