摘要
列控系统中数据通信子系统的可靠性对于保障列车安全高效运营具有重要作用.利用马尔可夫模型,综合了随机信道恶化,越区切换、无线接入设备故障等无线信道失效因素,提出了数据通信子系统非冗余结构和冗余结构的可靠性模型,分析了不同的数据通信系统结构对可靠性能的影响.同时,给出了列车运行速度与系统可用性指标的相互关系.分析结果显示,冗余结构的数据通信子系统有效提高了通信系统的可靠性;冗余结构的系统可用性指标比非冗余结构提高了大约两个数量级,达到99.99%;冗余结构有效消除了列车越区切换对系统可靠性能的影响.
The data communication subsystem （D C S） in control system is important to ensure the high efficiency and safety of train control. Based Markov process, the dependability model of DCS, which captures the channel degrade, handover and AP failure, proposed. The influence of different configuration and train velocity on the dependability of DCS is analysis. Performance evaluation shows that the redundancy configuration of DCS gains significant improvement in reliability than that of the no-re- dundancy one. The availability of redundancy configuration is as much as 99.99 %, which is about 100 times higher than that of the no-redundancy configuration. The redundancy configuration can efficiently eliminate the impact of handover on the dependability of DCS.
出处
《北京交通大学学报》
EI
CAS
CSCD
北大核心
2007年第5期23-26,43,共5页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
北京市科委资助项目(D0604003040811)
北京市教委资助项目(DX2005I0010)
关键词
基于通信的列车控制系统
可靠性分析
马尔可夫过程
冗余结构
可用性
communication based train control system（CBTC）
dependability analysis
Markov pro-tess
redundancy configuration
availability
