Development Of C-V2X Vehicle Terminal For Intelligent Transportation System

Traffic problems are intensifying with the increase in car ownership.Automobile industry is forming on the basis of Internet of vehicles,and various technologies are being derived to solve road safety and traffic congestion problems.V2 X,as a derivative of the Internet of Vehicles technology,currently has two different communication technologies,DSRC and C-V2 X,to realize the interconnection of vehicles and vehicles,vehicles and people,vehicles and roads,vehicles and remote servers,vehicles and transportation facilities,through information interaction and optimization algorithm,a complete collaborative intelligent transportation system is formed to warn traffic safety problems and alleviate traffic congestion problems.This article takes the V2 X vehicle terminal in the intelligent transportation system as the main research object,analyzes the two communication technologies of DSRC and C-V2 X,and establishes an embedded R&D program based on C-V2 X communication technology.The development of V2 X in-vehicle terminal includes the development of software and hardware.The hardware development is based on the hardware circuit design,the software is based on the embedded Linux underlying design,and the communication function is the core.The V2 X in-vehicle terminal developed realizes the processing and transmission of data between the vehicle and other subsystems,which can meet the communication needs of building an intelligent transportation system.The main work of this topic is as follows:1.Based on the C-V2 X communication technology,an MCU+MPU+LTE-V vehicle terminal hardware system with IMX6.Q as the main processor and DMDxx as the communication module is designed.The definition of the hardware interface between 11 modules ensures the efficient communication between each module of the system.The power supply system of the vehicle terminal and the peripheral circuits of various chips are designed,and the reliability analysis of the entire hardware system is performed to realize the highly reliable and high-performance operation of the vehicle terminal.2.Based on the ARM9 architecture and Linux development environment,the software system of the vehicle terminal is developed,the configuration of U-Boot and Kernel is completed,and the Jffs2 file system is established using the Busybox tool to complete the embedded Linux transplantation.The CAN and NET communication sockets are designed using the Socket protocol family,the terminal communication function is realized,and the scene transmission algorithm of V2 X data transmission structure and vehicle speed guidance is designed.3.Carry out electrical performance,EMC and RF performance experiments on the developed vehicle terminal according to the national standard and design requirements,and use the cloud platform to carry out joint debugging of the communication function and communication protocol with the terminal.The results show that the software and hardware system of the vehicle terminal meets the design specifications.Finally,the V2 X scene real car test was carried out,the function of speed guidance of urban roads was realized,and the function of the car terminal in the actual scene was verified.