Part Of The Design, Vehicle Positioning Gps-based Bus Scheduling System

Supervising and controlling system of vehicle based on GPS had been applied in China from 1990s,but workable production appeared in 2000.These productions communicated by SMS(Short Message Service).But this system has disadvantage inhered:Communication fee is higher because of paying SMS one by one,and SMS also was delayed and dropped. This reduces the system real-time and reliability.After the 2.5 generation mobile communication technology GPRS brought into market by China Mobile Corporation, the cost of data transmission has been reduced. Because of GPRS has characteristics of charge in quantity, always online, lower cost, make it become the best solution of mobile data transmission. Based on research of GPS,GPRS,we gave a design of new system as a whole and the implement of design of terminal on car and transmission way of position data.With the analysis of GPS location, GPRS communication, GIS (geological information system) technique, we studied technology on GIS/GPS application. The system is designed by taking advantages of GPS's full directions and precision, and the GPRS always online with low cost.Because of time the function that finished is limited, but it is the basic skill of a supervising and controlling system of vehicle based on GPS. With the research going on, the function may be more perfect.