Research And Realization Of Embedded Vehicle Positioning System Based On GPS/GPRS

While people owning their private cars nowadays, they will also be subject to high risks if they have their cars been stolen, thus along with huge economical losses. Cars-stolen has become a major public jeopardize across the world. At present, the researches on car anti-theft system based on GPS/GPRS and network have become a hot pot because of the increasing development of micro-electronic technology, GPS and wireless communications technology.Firstly, the basic theory of embedded GPS/GPRS vehicle positioning system, and its research and application conditions in home and foreign were detailedly expounded. In view of the current car anti-theft device's shortcomings such as: high rate of false alarms, installation and maintenance inconvenience, sound and light pollution and high cost, then proposed a vehicle positioning and tracking strategy that mainly composed by the vehicle positioning terminals and the vehicle owner, and supplemented by monitoring center. In this strategy, vehicle positioning terminals and the vehicle owner exchange the alarm and control information by using short message. According to the vehicle owner's needs, established the data communication between the vehicle terminal and the monitoring center, and put real-time vehicle positioning and tracking in practice.Based on the above ideas, this paper designed the hardware framework based on the ARM9 microprocessor, GPS module, GPRS module and acceleration sensor, and elaborated on the system's hardware circuit design process. The paper presents an application of real time and multithread characteristic of embedded Linux. It briefly introduced the method and the program of real time sampling from multi-sensors, and resolved the multi-mask running concurrent. Finally configurate the software systems and transplanting them to the hardware system based on S3C2410A.Case study have proved out that this vehicle terminal is suitable for inquire the vehicle status, positioning and tracking, and achieve predetermined requirements because of low-cost of communication and easy to operate.