自主式交通系统逻辑架构可靠性分析与评价

Reliability analysis and evaluation of logical architecture for autonomous transportation system

随着交通系统自组织运行与自主化服务能力的快速发展,自主式交通系统(ATS)正逐渐成为未来交通的重要发展方向,而其逻辑架构的可靠性十分关键,但现有关于交通系统框架的评价大多集中在其影响以及效益方面。因此,基于复杂网络理论,从系统拓扑的层面上对ATS逻辑架构可靠性进行分析与评价,并识别出需要重点维护的薄弱节点。首先,以道路自主式安全自动驾驶场景的ATS逻辑架构作为研究对象,介绍其基本结构,并分析复杂网络理论应用的可行性。其次,通过各服务及其数据流的重要程度确定边的权重,构建加权网络模型,并根据节点度、节点强度、平均路径长度、聚类系数和全局效率等指标进行复杂网络类型判断和网络拓扑特性分析。在此基础上,根据节点强度法、节点介数法以及互信息法对节点重要性进行评估。最后,通过分析表明,道路自主式安全自动驾驶场景的ATS逻辑架构网络具有小世界和无标度网络特性,网络整体结构紧凑且数据传输效率高。基于强度、介数和信息量3个指标分析得到的自动驾驶车辆、交通运行管理部门以及通信基站等薄弱节点在整个网络数据传输过程中需要重点维护。利用复杂网络理论对ATS逻辑架构可靠性进行分析与评价,可为未来ATS逻辑架构建设提供理论依据和可靠性层面的指导。

With the rapid development of the Autonomous Transportation System(ATS),it is necessary to comprehensively analyze the reliability of its logical architecture.However,most of the existing evaluations on the transportation system framework focus on the impact and benefits.Therefore,based on complex network theory,the reliability of the logical architecture from the perspective of network topology was analyzed and evaluated,and the important nodes that require priority maintenance were identified in this study.First,the basic structure of the logical architecture for ATS in the road automatic safe autonomous driving scenario was introduced,and the feasibility of complex network theory application was analyzed.Second,a weighted network model was constructed by determining the weight of edges based on the importance of each service and its data flow.The type of complex network was determined,and the network topology was analyzed according to the index of node degree,node strength,average path length,clustering coefficient,and global efficiency.On this basis,the node importance was evaluated according to the node strength method,node betweenness method,and mutual information method.Finally,the analysis shows that the logical architecture for the ATS network which is a small-world and scale-free network has a compact structure and high data transmission efficiency,and key nodes such as autonomous vehicles,traffic operation management department,and communication base station need to be maintained during the whole data transmission process.Based on complex network theory,this study provides theoretical reference and guidance on the reliability of the logical architecture for ATS.