数字直放站交织冗余覆盖方案研究

Research on Overlapped Redundant Coverage Scheme of Digital Repeater

为既有铁路通信GSM-R系统改造项目中有效节省投资、充分利用既有资源,并在复杂地形条件下保证GSM-R系统信号的稳定覆盖,分析了GSM-R冗余覆盖的可靠性;介绍了数字直放站的主要技术优势及特点;计算分析了在满足时延情况下数字直放站最大拉远距离;重点研究对比了八光口交织冗余覆盖方案、同站址双设备交织冗余覆盖方案及四光口交织冗余覆盖方案;指出了四光口交织冗余覆盖组网方案的几大优点。针对地形复杂、光纤资源少等既有铁路通信GSM-R系统改造项目,可考虑借鉴此方案。

In order to effectively save investment, make full use of existing resources and ensure the stable coverage of GSM-R system signals under complex terrain conditions in the transformation project of existing railway communication GSM-R system, the reliability of GSM-R redundant coverage is analyzed;the main technical advantages and characteristics of digital repeater are introduced;the maximum remote distance of digital optical fiber repeater is analyzed under the condition of satisfying time delay;this paper focuses on the research and comparison of eight-optical-ports interweaving redundancy coverage scheme, the same-site-dual-device interweaving redundancy coverage scheme and four-optical-ports interweaving redundancy cover scheme;several advantages of the four-optical-ports interleaving redundancy coverage scheme are pointed out. For the existing railway communication GSM-R system transformation projects with complex terrain and less optical fiber resources, this scheme can be considered for reference.