基于高性能射线跟踪技术的城市隧道无线信号覆盖研究

Research on wireless signal coverage in urban tunnels based on high-performance ray tracing

城市隧道封闭狭长的结构使其内部的电波传播特性不同于室外,其内部的无线信号覆盖情况一直都被广泛关注.隧道内的无线通信系统可承载安全管理、调度指挥等业务,在行业信息化方面发挥重要作用.随着天线技术的不断成熟,分布式天线系统已逐步应用在城市隧道内.采用高性能射线跟踪技术开展分布式天线系统的无线信道仿真,得到分布式天线系统的部署方案,并对分布式天线系统和泄漏电缆系统的无线信号覆盖情况进行比较.结果表明在城市隧道内分布式天线系统的天线间隔采用400 m即可满足接收门限要求且可实现近似泄漏电缆的均匀覆盖效果,为城市隧道内分布式天线系统的部署提供了理论与技术支持.

Wireless communication system inside the tunnel can support services such as security management, dispatch and command, playing an important role in industry informatization. As antenna technology has become increasingly mature, distributed antenna system has been gradually applied in urban tunnels. Therefore, this study adopts the high-performance ray-tracing technology to conduct wireless channel simulation of distributed antenna system. The deployment scheme of the distributed antenna system is then obtained.The wireless coverage of the distributed antenna system and the leaky cable system are compared. The results show that the distributed antenna system with 400 m interval in urban tunnels can satisfy the receiving-end threshold requirement and achieve coverage quality similar to that of the leaky cable. This study provides theoretical and technical support for the deployment of the distributed antenna system in urban tunnels.