铁路信号系统安全软件架构分析方法

Analysis Method for Safety Software Architecture of Railway Signaling System

软件在信号系统安全关键控制和防护功能中发挥的作用越来越大。对铁路信号系统安全软件架构设计进行安全分析时,因其组件之间的交互复杂性,需要采用系统方法,关注组件之间异常交互对系统安全性的影响。结合软件开发工程实际,基于EN 50128对铁路信号系统防护软件的要求,提出安全软件在架构设计阶段进行软件错误影响分析的完整流程和实现的技术措施。该流程通过确定分析范围和分析层级,着重分析软件本身错误对系统功能安全的影响,具有高效性和实用性。

Software plays a more and more important role in the critical security control and protection function of the signaling system.During the security analysis on the architecture design of railway signaling system security software,due to the complexity of interaction among its components,it is necessary to adopt a systematic approach and pay attention to the influence of abnormal interaction among components on system security.In combination with the actual conditions of software development engineering and based on the requirements of EN 50128 for railway signaling system protection software,this paper puts forward the complete process and technical measures for error impact analysis of security software in the architecture design stage.By determining the analysis scope and level,the process focuses on analyzing the influence of software errors on the functional security of the system,which is efficient and practical.