Design And Research Of Driverless Subway Data Processing System Based On High Precision Clock Synchronization

With the rapid development of science and technology,computer technology and fieldbus technology have also ushered in an era of vigorous development.The communication system and the central master control system used in modern subway trains have been improved with each passing day.New fieldbus technologies are also increasing.To ensure the safety and reliability of the equipment on the train is the premise of the safe and stable operation of the train.It is also the basis of train operation that the real-time communication data between the train master control system and each auxiliary system can be realized quickly and accurately,and it is also a problem worth studying in the field of train communication.The article first introduces the current research status and development trend of unmanned train control systems and high-precision clock synchronization,and then focuses on the basic principles of the IEEE1588 protocol,the best master clock algorithm and the principle of master-slave clock synchronization.Finally,a detailed analysis and introduction to the system designed in this article.In this paper,an unmanned subway data processing system based on high precision clock synchronization is designed and completed.The whole system is divided into high precision clock synchronization module and data processing module.The hardware design of the clock synchronization module adopts STM32 as the main controller and the physical layer network chip DP83640 to assist.The software includes optimal master clock algorithm design,RTOS operating system and LWIP protocol stack construction.The hardware design of the data processing module adopts FPGA as the main control chip,and the combination of hardware and software completes the communication with the train positioning sensor and on-board ATP,so as to realize the automatic control of the driverless subway train.In the system testing phase,the first clock synchronization precision test system,and then to live sports car test system,test results show that based on high precision clock synchronization driverless metro data processing system,the precision of the clock synchronization of microsecond,meet the requirements of the synchronization precision of driverless metro trains,and through the PC to complete the train location,speed and a barrier-free show ahead.