The Research And Design Of Vehicle Mobile Terminal Based On Embedded System

With the social advancing, our country's transportation industry has developed greatly, but many problems of the traffic management has come out ,which increase the difficulty of vehicle management and controlling .Therefore, how to use existent technology to implement effective monitoring of vehicle has practical significance.Vehicle mobile terminal is an important part of vehicle monitoring system. GPS equipment of vehicle mobile terminal is used for the monitoring by the vehicle monitoring system. The location information processed by control module is transmitted to monitoring center through the GPRS wireless communication network. Then correlative measures are taken and corresponding controlling orders of vehicle mobile terminal are sent out by the monitoring center combining GIS system after the analysing of the location information.In the first instance , the background significance of research is introduced in this paper.Then the relative technologies of vehicle monitoring system are illuminated, and project designing of the system is brought forward, which includes the design and implementation of hardware platform, customization and transplantation of operating systems,the choice of software development platform and development of application program, etc.Subsequently, we focus on the function design of the software of vehicle mobile terminal and monitoring center. The software of vehicle mobile terminal includes following aspects. First, the customization and transplantation of the embedded operating systemμC/OS- II .The system has the advantage of hardware and software upgrading, if replacing the hardware platform, a few of transplantation work to the operating systems just need to be done, without modifying the irrelevant hardware application code. Also, if adding new functions, we only need to design a new task to join to the system in terms of the timing allocation priority, then software upgrading would be realized. Second, the designing of the system communication protocols. This system frames a set of communication protocols to equal the data format between monitoring center and vehicle mobile terminal, then orders can be only identified by the system to carry out the correct operations.Third, the designing of the main program of system. These include the design of system initialization, serial interruption, GPS data, GPRS link and vehicle alarming processing,vehicle mobile terminal configuration processing, designing of TTS processing program.The final part of this paper is the designing of the monitoring center software. These include, implementing the basic operations of zoom, ranging and layers controlling of electronic map by using Visual C++ embedded mapx. According to the users needs, monitoring centre staffs use the electronic map to actualize classification inquiring and locating. Through processing by the map matching algorithm, the track of electronic map is comparatively smooth, and positioning errors become less.To conclude, the vehicle mobile terminal designed in this paper is compact, reliable with function and is of well expansion. It has performed well in the actual state of roads and achieved the expected results, however, the system's stability needs further improvement.