摘要
铁路既有450 MHz无线列调系统急需转型升级为基于400 MHz频段的列车数字无线调度通信系统(DRTD)。针对DRTD频点数量不足,在线路并线、接轨、交会等特殊场景下易产生同频干扰的问题,首先研究DRTD架构及相关设备的射频指标,采用Egli和Okumura-Hata 2种传播模型计算路径损耗,通过对比得出城区场景下宜采用Egli模型,郊区、开阔区宜采用Okumura-Hata模型;其次选取影响无线信号收发的相关参数,并结合2种传播模型提出DRTD同频干扰保护距离的计算方法;最后,在线路并线、接轨、交会等特殊场景下,根据同频干扰保护距离计算方法,得出不同场景下的同频干扰保护距离,即城区大于10.6 km、郊区大于15.6 km、开阔区大于56 km,并给出相应的同频复用建议,可为后续DRTD大规模建设及同频干扰保护提供一定的参考与借鉴。
The existing 450 MHz wireless train dispatching communication system of railway urgently needs to be transformed and upgraded to the digital radio communication system for train dispatching(DRTD)based on 400 MHz frequency band.Due to the insufficient number of DRTD frequency points,it is prone to cause co-frequency interference in special scenarios such as track merging,line connection,and intersection.To address this problem,the architecture of DRTD and RF indicators of related equipment are investigated firstly.The path loss is calculated using two propagation models,namely Egli’s model and Okumura-Hata’s model.Through comparison,it is concluded that the Egli model should be adopted in urban scenarios,while the Okumura-Hata model should be used in suburban and open areas.Secondly,by selecting relevant parameters that affect wireless signal transmission and reception,and combining the two propagation models,a calculation method for the protection distance against co-frequency interference of DRTD is proposed.Finally,in special scenarios such as line paralleling,connection,and intersection,based on the calculation method of co-frequency interference protection distance,the co-frequency interference protection distances under different scenarios are obtained:not less than 10.6 km in urban areas,not less than 15.6 km in suburban areas,and not less than 56 km in open areas.And corresponding suggestions for co-frequency reuse are also given,which can provide some reference and inspiration for the subsequent large-scale construction and co-frequency interference protection of DRTD.
作者
宋宗莹
李雪
朱镔汉
SONG Zongying;LI Xue;ZHU Binhan
出处
《铁道通信信号》
2025年第9期39-44,共6页
Railway Signalling & Communication
基金
国家铁路局课题研究计划(KF2025-061)。
关键词
列车数字无线调度通信系统
传播模型
特殊场景
频率规划
同频复用
Digital radio communication system for train dispatching(DRTD)
Propagation model
Special scenarios
Frequency planning
Co-frequency reuse
