Research And Realization Of On-board Host Mainframe Software For Modern Tram

With the development of urbanization in China,urban traffic problems have gradually become the core of people's attention.The rapid development of the subway has effectively improved the efficiency of urban transportation,but for the second and third-tier cities,a more cost-effective transportation mode is needed to solve the problem of urban traffic congestion.The rapid development of modern trams has effectively solved this problem.Through the analysis of the functional requirements of the vehicle signal system,the main functional modules of the tram on-board host are determined.At the same time,the key technology of the positioning module is studied emphatically,and the combined positioning method is put forward for positioning.The software of speed monitoring module,positioning module software,door control software and intersection priority application software are designed,and the function is verified by simulation.Firstly,the research background and significance of the modern tram on-board host are introduced in detail,the research status at home and abroad is analyzed and the main research contents of the paper are briefly introduced.Secondly,the system modules of tram are summarized,the business flow chart of modern tram is analyzed,the differences between tram signal system and other rail transit signal system are compared,the frame structure and software function modules of tram car host are designed,and the interface software with other systems is designed.Then,several commonly used positioning methods are compared.Through the analysis and comparison of the advantages and disadvantages of several positioning methods,the combination of satellite positioning and dead reckoning positioning is selected as the positioning method of tram,and the positioning principles of the two positioning methods are explained.Federal kalman filter algorithm is used to optimize the positioning results and effectively improve the positioning accuracy.The superiority of this positioning algorithm is proved by comparing the error before and after filtering.Finally,Microsoft Visual Studio 2013 is selected as the development platform of modern tram on-board host software.Based on the simulation environment,the debugging of each module function of modern tram on-board host is completed,and the software function simulation of the approaching section of intersection and the approaching section of turnout is realized when the tram is operating on the main line,the calculation of the maximum limit speed curve is realized,and the logic judgment of the door control is completed.Through the simulation experiment,the on-board host designed in this paper realized the functional requirements of the tram signal system.