摘要
随着铁路450 MHz、800 MHz频段腾退工作的推进,列车数字无线调度通信系统(DRTD)的规模化部署显著提速,构建高可靠、低时延且节省投资的无线覆盖设计方案,已成为当前研究热点。DRTD通过固定电台与数字光纤直放站的协同组网实现无线覆盖,采用Egli模型和Okumura-Hata模型,可预测固定电台和直放站在开阔区的无线覆盖半径。在覆盖预测的基础上,针对传输时延与干扰抑制等工程约束条件,提出基于最大允许设备间距的差异化覆盖方案。综合分析DRTD特性、无线传播环境,以及覆盖设计关键要素,提出固定电台射频输出、直放站时延调整和固定电台射频拉远3种开阔区组网方案,并进行对比评估,明确各自的适用条件。举例分析结果表明,针对长度为30 km的平原长大区间,建议采用固定电台射频拉远组网方案,以减少站点设置,节省工程投资。
With the progress of the decommissioning work of the 450 MHz and 800 MHz frequency bands for railway,the large-scale deployment of the digital radio communication system for train dispatching(DRTD)has significantly accelerated.Thus,constructing a wireless coverage design that is highly reliable,has low latency,and saves investment has become a current research hotspot.The DRTD achieves wireless coverage through coordinated networking between fixed radio stations and digital optical fiber repeaters.The propagation models such as Egli and Okumura-Hata are employed to predict the wireless coverage radius of fixed radio stations and repeaters in open areas.Based on the coverage prediction,considering the engineering constraints such as transmission delay and interference suppression,a differentiated coverage scheme based on maximum allowable equipment spacing is proposed.By comprehensively analyzing the characteristics of DRTD,wireless propagation environment and the key elements of coverage design,three open-area networking schemes are presented:RF output of fixed radio stations,delay adjustment of repeaters and RF remote extension of fixed radio stations.These schemes are compared and evaluated,and their respective applicable conditions are clarified.The case analysis results show that for a 30 km long and wide plain area,it is recommended to adopt the fixed station RF remote extension networking scheme to reduce the number of stations and save project investment.
作者
李雪
赵波
焦晓辉
LI Xue;ZHAO Bo;JIAO Xiaohui
出处
《铁道通信信号》
2025年第9期15-21,共7页
Railway Signalling & Communication
基金
国家自然科学基金(U2268201)。
关键词
列车数字无线调度通信系统
开阔区
链路预算
数字光纤直放站
无线覆盖
时延
Digital radio communication system for train dispatching(DRTD)
Open area
Link budget
Digital optical fiber repeater
Wireless coverage
Delay
