面向智能网联交通系统的模块化柔性试验场

To provide a reference for the design and construction of an intelligent and connected transportation system, this paper reviews the status of testing technology in existing research. Combining the experience of testing and research on connected and autonomous vehicle test-sites at Chang'an University, this paper proposes a modular flexible test bed for an intelligent and connected transportation system. The modular flexible test bed included an application layer, a sensing and releasing layer, a network link layer, and a management service layer. The application layer simulated a real-world intelligent connected environment. The adaption of devices and services in different environments for intelligent connected transportation can be verified by simulating various aspects of weather, roads, and traffic conditions. The sensing and releasing layer collected information of the environment and traffic system and released control and service information, through sensing devices including a camera, light detection and ranging (lidar) device, and millimeter-wave radar, and releasing devices including a variable information board. The network link layer consisted of a heterogeneous vehicular network. Through collaboration among networks, the network link layer could provide transparent transmission and exclusive network information services for devices and services in the application and sensing and releasing layers. The management service layer managed storage, backup, processing, and visualization of the lower layers' data, and implemented the management and maintenance of the lower layers' test devices. Based on the modular test bed mentioned above, an in-door test bench for an intelligent and connected vehicle was developed to cooperate with the test bed for simulating, recreating, and adjusting a traffic scene, so as to realize a flexible intelligent and connected transportation test. The modular flexible test bed for an intelligent and connected transportation system proposed in this paper has a standardized test environment and uses a controllable and traceable test process and scientific test evaluation method. It can verify intelligent and connected devices and services on functionality, application processing, application effects, and service utility, in different dimensions. The construction, promotion, and application of the modular flexible test bed for intelligent and connected transportation systems can promote the transformation of intelligent and connected technology from theoretical research to practical application and will play a crucial role in achieving innovation and reform of future transportation information services and transportation systems.