Research On Interface Technology And Security In Urban Rail Traffic Interlocking System

With the favorable momentum of China’s economic development, enlargement of the city scales as well as the increasing of the urban population, the existing urban transportation mode is unable to meet the travel demand. Thus developing the urban rail transit vigorously has become a new norm in the society, which requires the urban development department to adjust the development direction so as to ensure the travel needs of urban residents.The development of urban rail transit has brought good market prospect for its signal system, however, the computer interlocking system has played the most important roal in signal system. Communication based train control(CBTC) system is the mainstream signal system in current urban rail transit, so the research on communication interface between automatic train protection(ATP), automatic train supervision(ATS) and computer interlocking system is particularly important. As the background of lanzhou urban rail line 1, researches on the interface between all electronic computer interlocking system and ATS, ATP, platform screen doors, metro flood gate, interlocking system in depot.Firstly, based on the analysis of the interface functional requirement between the computer interlocking system and metro flood gate, platform screen doors, rolling stock depot,ATP, ATS. Combines the methods of designing interface and some related safety standards to make a detailed analysis of relevant communication interface design. According to the characteristics of each subsystem, determine its way of passing information.Secondly, in the aspect of hardware design, focuses on the all electronic computer interlocking system and platform screen doors’ s state transfer interface circuit, control command transfer interface circuit, metro flood gate transfer interface circuit, "request closed" information transfer circuit, "allow closed" information transfer circuit, rolling stock depot interlocking system’working principle of transmission circuit and fault- safety principles.In the aspect of communication interface design, this paper analyzed the data exchange between the all electronic computer interlocking system and ATP, ATS, designed the secure communication interface between all electronic computer interlocking system and ATP, ATS.This paper elaborate a variety of security measures on secure communication protocol, as well as the establishment of the communication, initialization, maintaining and closing process.Using VC++6.0 to build the simulation network, with the station ATS extension and operating display machine/under interlocking machine’s communication between the server and the client pattern implementation. Through the communication process simulation and the fault test simulation to verify the feasibility of communication interface design.Finally, this paper combines adoptive security measures in the design, analys the security of involved relay interface circuit and communication interface, futher calculates thereliability of the hardware connection between all electronic computer interlocking system and ATS, ATP, platform screen doors, metro flood gate, interlocking system in depot. On this basis, calculate all electronic computer interlocking system and ATP, ATS system’s probability of communication message transmission dangerous side, the results prove that safety communication protocol to meet safety requirements.The research on external interface of full electronic computer interlocking systematically in this paper, provides relevant reference for the practical application and theoretical research in the future.