摘要
在基于通信的列车控制系统中,区域控制中心ZC(Zone Controller)子系统负责向列车发布移动授权,对于保障列车安全高效运营具有重要作用。为提高ZC的可靠性,设计中通常会使用冗余结构,其内部的安全通信协议就成为系统成败的关键。本文介绍构建于UDP协议之上的ZC内部安全通信协议的设计与实现,利用OP-NET网络仿真工具对该协议进行建模,并模拟VxWorks实时操作系统的多任务调度环境,构建基于交换式以太网的通信性能仿真研究平台。根据ZC的实际运行情况,对通信过程进行仿真,分析了发送窗口对报文最大时延的影响。仿真结果表明,适当的发送窗口数量可以兼顾通信效率和时间精度。
The Zone Controller（ZC） subsystem in the communication-based train control system is responsible to issue movement authority to the train,thus playing an important part in ensuring the high efficiency and safety of train control.The redundancy structure is designed to improve the reliability of ZC,and the security communication protocol in the redundancy structure is the key factor to determine whether the system is successful or not.The design and implementation of the UDP-based security communication protocol are introduced.The module of the protocol is built using OPNET,the multi-task schedule of the VxWorks real time operating system is simulated,and the communication performance research platform is set up on the basis of the switched Ethernet.The communication process is simulated basing on the real running situation of ZC,then the influence of the send window on the maximum delay of packets is analyzed.Simulation results show that the appropriate number of send windows is able to improve the precision of communication time and the efficiency of data transmission at the same time.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2010年第3期43-48,共6页
Journal of the China Railway Society
基金
国家自然科学基金资助项目(60634010)
教育部创新团队发展计划项目(TRT0605)
