Research And Development Of Vehicle Networking Gateway Controller

With the development of sensor technology,mobile communication technology and information processing technology,intelligent transportation system(ITS)has become an effective means to solve the problem of road congestion.The Internet of Vehicles is an important part of the realization of intelligent transportation system.Vehicles,as a network node,are connected to the Internet and can realize information exchange with road infrastructure,other vehicles and management centers.Based on the research of intelligent transportation system and Internet of Vehicles at home and abroad,this paper designs a gateway controller for Internet of Vehicles which integrates CAN bus network,Ethernet technology,GPRS and NB-IoT wireless communication technology.The gateway controller of Internet of Vehicles can realize the data intertransfer between wired network and wireless network,real-time data transmission and external communication in the car,which has certain research and development value.According to the requirements of high real-time performance,large amount of data,high rate transmission and external network connection for the application of vehicles,a hardware system of gateway controller for Internet of vehicles is designed,which is based on ARM STM32F4 chip and integrated with CAN,Ethernet,GPRS and NB-IoT communication modules.After the selection of the above modules,the schematic modular design of ARM STM32F4 chip as the main controller and the four-layer PCB design of "signal-ground-power-signal" are completed.Taking Keil as the software development environment,the program design of CAN,Ethernet,GPRS and NB-IoT is carried out under the framework of FreeRTOS operating system,including the initialization,receiving and sending program of CAN module,the TCP/IP communication design of Ethernet module,the network entry communication design of wireless module,and the protocol conversion design of each communication module.In order to ensure the security of data transmission in the Internet of Vehicles,aiming at the problem that the information source cannot be confirmed,the national secret algorithm SM3 combined with random number is used to conduct two-way authentication for the identity of CAN network node and gateway controller,which effectively eliminates the information transmission of false information sources.Aiming at the problem of transparency of CAN data transmission,the national secret algorithm SM4 combined with CBC mode is used to encrypt CAN message transmitted from CAN network node to gateway controller,which effectively solves the operation of the attacker's snooping plaintext.Finally,based on the relevant hardware platform,multiple auxiliary software are used to verify the functions of the gateway controller CAN and Ethernet,CAN and USART protocol conversion,and the information security verification including identity authentication and information encryption is completed.The gateway controller of Internet of Vehicles integrated with in-car network technology and wireless communication technology is studied.The hardware and software design and information security design of CAN,Ethernet,GPRS and NB-IoT communication modules are completed.The experiment verifies the validity of CAN and Ethernet,CAN and USART protocol conversion function,identity authentication and information encryption information security function.