Application And Research Of Database Storage Unit In CBTC System

Communication based train control system is the most popular and important automatic train control System in the modern world. It can accomplish its data communication utilizing continuous, high capacity, bi-directional train-to-wayside data communications. CBTC system contains a lot of subsystems, which are inosculated together and can realize the powerful function of CBTC system.Hereinto, DSU is shorted for database storage unit. It is one subsystem of communication based train control (CBTC) system. DSU can save and provide all of the CBTC data, and realize many data processing functions, such as data research, data exchange and data download. After consulting many correlative materials information, this paper generally researches and designs the DSU subsystem of CBTC system. This paper defines the configuration and character functions of all the sub-databases, and analyses all kinds of data processing methods. The paper also constructs all modules of the data storage and management subsystem in DSU system, and provides the development strategy of embedded DSU software system including real-time characteristic. The design steps and development flows of the software system are emphasized in this paper in order to establish the embedded DSU software platform.Considering the safety demands of the simulation system and its actual equipment, this paper suggests developing the DSU system based on the safety computer. And it should be done by utilizing computer C language to compile the source code of the program based on VxWorks, which is one of embedded real-time operating system. Besides, the paper makes a qualitative research on the characters of data security and database security in DSU system. And the emphasis is that how the construction of DSU represent the demand of data security. Finally, this paper summarizes the task, and looks forward to prospect, for example how to put the actual equipment into further job.