基于CBTC车地无线通信系统2.4GHz频段抗干扰性能提升和改造的应用
占礼辉陈抒华王磊
Application of 2.4 GHz Frequency Band Anti-Interference Performance Improvement and Transformation Based on CBTC Vehicle-Ground Wireless Communication System
ZHAN LihuiCHEN ShuhuaWANG Lei
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作者信息:杭州地铁运营有限公司，310017，杭州
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Affiliation:Hangzhou Metro Operation Co., Ltd., 310017, Hangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.12.043
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中图分类号/CLCN:U231.7
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栏目/Col:研究报告
摘要:
［目的］城市轨道交通的信号系统使用2.4GHz频段车地无线通信系统，但其极易受到通信运营商、民用Wi-Fi、个人热点、蓝牙、RFID（射频识别）技术等设备的干扰，导致车地通信中断故障频发，甚至影响列车的正常运营。因此，需研究CBTC（基于通信的列车控制）车地无线通信系统2.4GHz频段抗干扰性能和应用改造措施。［方法］介绍了因车地通信中断而导致的列车紧急制动故障问题；介绍了抗干扰性能提升方案；以杭州某地铁线路为例，通过现场测试等方法开展5.8GHz频段改造工程。［结果及结论］通过采取固定干扰源排查整治、加装屏蔽装置、通信运营商频段调整等多种措施以提高抗干扰性能。结合现阶段5.8GHz频段应用情况及线网内5.8GHz频段信道占用情况，将车地无线组网方式由2.4GHz（A网）+2.4GHz（B网）改造为2.4GHz（A网）+5.8GHz（B网）的组网方式。在采取多种抗干扰措施后，车地通信故障得到了缓解，通过5.8GHz频段改造应用，解决了杭州地铁某线路因车地无线通信中断导致列车产生紧急制动的问题。
Abstracts:
［Objective］ Urban rail transit uses a 2.4 GHz frequency band vehicle-ground wireless communication system for the signal system, which is extremely susceptible to interference from communication operators, civilian WiFi, personal hotspots, Bluetooth, RFID (radio frequency identification) technology and other equipment, resulting in frequent vehicle-ground communication interruptions and even affecting the normal operation of trains. Therefore, it is necessary to study the anti-interference performance and application transformation measures of the 2.4 GHz frequency band in CBTC (communication-based train control) vehicle-ground wireless communication system. ［Method］ The problem of train emergency braking failure caused by vehicle-ground communication interruption, as well as the solution to improve anti-interference performance are introduced; taking a certain metro line in Hangzhou as example, a 5.8 GHz frequency band transformation project is carried out through on-site testing and other methods. ［Result & Conclusion］ The anti-interference performance is improved by taking various measures such as investigating and rectifying fixed interference sources, installing shielding devices, and adjusting the frequency bands of communication operators. Based on current situations of the 5.8 GHz frequency band application and channel occupancy in the line network, the vehicle-ground wireless networking mode is transformed from 2.4 GHz (A network)+2.4 GHz (B network) to 2.4 GHz (A network)+5.8 GHz (B network). After taking a variety of anti-interference measures, vehicle-ground communication failures are alleviated. Through the transformation and application of the 5.8 GHz frequency band, the train emergency braking problem caused by vehicle-ground wireless communication interruption on a certain line of Hangzhou Metro is solved.
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