The Study On The Electronic Map Matching System Based On Beidou

With the rapid development of China’s railways,trains have become more and more people’s travel options as a popular means of transportation.In order to ensure the safety of people’s lives and property,Beidou satellite positioning technology is applied to the continuous positioning and management of railway trains,and it is even more capable.To meet the requirements of modern railways for efficient monitoring,automatic continuous,high-precision and reliable train positioning.Therefore,research on the Beidou-based key technology of train positioning and the technology of electronic map matching to achieve real-time continuous positioning for China’s railway trains is of great significance for the safety control of trains in China and the development of railway transportation.In this paper,an electronic map matching system based on Beidou train positioning is designed.Based on this,the map matching algorithm is also studied and verified.The main work of the dissertation is as follows:The basic principles of Beidou satellite navigation technology,GIS technology,GPRS technology and computer technology are studied;the functional requirements of the train terminal,remote server system,and electronic map positioning browser are analyzed;according to the system design requirements,design principles and working principles,Out of the overall system design.In the lower machine part,the STM32F103 microprocessor is used as the main control chip,and the Beidou satellite receiver module,GPRS communication module and peripheral circuits are externally expanded to carry out the hardware design of the train terminal.The procedure of positioning and communication function of the train terminal is designed and programmed in the development environment.The design of the upper computer positioning and monitoring center adopts the B/S architecture,and the remote server construction,database design,electronic map rendering,and electronic map positioning browser end design are performed.Using database technology,ASP.NET technology,ADO.NET technology,and hypergraph technology,the electronic map browser is designed and implemented to perform real-time positioning and display of the train and track playback.Combining the characteristics of electronic map and train driving,a compound matching algorithm is improved.Different algorithms are used in different sections of the road.The accuracy and reliability are verified by simulation.The composite matching algorithm is implemented in the actual system.