北斗定位與通信一體化的智能車載網(wǎng)絡(luò)終端的開發(fā).pdf

1、 Abstract Abstract With the rapid development of China’s logistics industry, extensive attention are paid to intelligent logistics management system and demands for accurate vehicle monitoring and scheduling are becomin

2、g increasingly urgent. In order to achieve effective commands, coordinated control and management of all kinds of vehicles, and improve the efficiency and security of logistics，many vehicle monitoring research institut

3、ions and companies both at home and abroad have given priority to research and develop embedded vehicle terminal system. At present, due to the limitation of different models and application scenarios, the universality

4、of car terminal products available in the markets is poor; some cars has the only function of vehicle positioning; some cars possess poor adaptability and augmentability, causing that on-board network cannot be easily

5、built between terminal equipment and all kinds of vehicle information cannot be flexibly collected. Moreover, there are no universal standards for car terminals and peripherals. As a result, the interconnection and inte

6、rworking among them are hard to realize. According to the existing problems of current vehicle terminal system in current logistics environment, a intelligent vehicle network terminal of Beidou positioning and communica

7、tion integration based on STM32 is developed, which includes terminal host and RFID peripheral. As microcontroller STM32F103ZET6 acts the core, this terminal host consists of three modules. UM220 module is in charge of

8、receiving beidou satellite positioning signals. Domestic beidou positioning technology can be used to get rid of the dependence on foreign navigation potential harm, technology will no longer be disciplined by others. B

9、oth SIM900A and USR-WIFI232 are wireless communication modules. Based on existing GPRS mobile communication network infrastructure, SIM900A is used for the transmission of information between intelligent vehicle terminal

10、 and monitoring and controlling platform. USR-WIFI232 module is responsible for making connection to all kinds of intelligent peripherals and building cars’ WiFi network via a serial port wireless transmission mode. As

11、 microcontroller STM32F103RCT6 acts the core, this RFID peripheral consists of two modules. PN532 module is used for reading and writing information of Mifare card or Driver certification RFID card, thereby giving the r

12、ealization of various application information,gathering and transmitting them to terminal host. In accordance with the requirements of the system’s overall technical solution, the whole structure and function of the veh

13、icle terminal is firstly determined and all the techniques involved are analyzed and selected. Then, the design of terminal hardware is completed on Altium Designer Release10 Platform, which is followed by design of te

14、rminal software. With plentiful peripheral interfaces, terminal hardware can flexibly expand peripherals which can be conveniently and efficiently used by means of plug and play. According to JT/T808-2013communication p

15、rotocol specification issued by national ministry of transport, the software design of terminal display and each terminal module’s function is completed on Keil uVision5. Finally, connected with communication and contr