This paper introduces a software design of a vehicle positioning system using GPRS technology. The composition and working principle of the vehicle positioning system are explained, and the method of implementing network protocol stacks such as TCP/IP and PPP in ARM embedded systems is introduced. Taking advantage of the GPRS\'s permanent online and high communication rate, the system realizes real-time information interaction between the monitoring center and the vehicle terminal. Moreover, the effectiveness and stability of the system have been verified in practical applications.
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