The vehicle GPS positioning management system is mainly used for the vehicle GPS autonomous positioning, combined with the wireless communication system for vehicle scheduling management and tracking. Such as vehicle global positioning alarm system, police GPS command system, etc. have been successfully developed. They are respectively used for urban bus dispatching management, vehicle and ship alarm and dispatching in scenic tourist areas, and dispatching and monitoring of vehicles and ships by customs, public security, coastal defense and other departments.

　　The main functions of the monitoring center are:

　　◆ Data tracking function. The real-time position of the moving vehicle is displayed in the form of frame list. Such as car number, longitude, speed, heading, time, date, etc.

　　◆ On diagram tracking function. The positioning information of the mobile vehicle is displayed on the corresponding electronic ground (sea) map background. The electronic earth (sea) map can be enlarged, reduced, restored and switched at will. There are two reception methods: normal reception and random roll call reception. It can also provide the function of selecting whether to run the vehicle track.

　　◆ Analog display function. The known target location information can be input into the computer and displayed.

　　◆ Decision command function. The decision-making command communicates with the mobile vehicle by means of communication. The communication mode can be text, code or voice to achieve dispatching command.

　　The main functions of the on-board part are:

　　◆ Positioning information sending function. The GPS receiver locates in real time and sends the positioning information to the monitoring center through the radio station.

　　◆ Data display function. Display the real-time position of the vehicle on the display unit. Such as longitude, latitude, speed and heading.

　　◆ Receive dispatching command. Receive the dispatching command from the monitoring center, and display or send voice on the display unit.

　　◆ Alarm function. Once an emergency occurs, the driver starts the alarm device, and the monitoring center will immediately display the vehicle situation, accident location, vehicle personnel and other information.

　　Vehicle GPS positioning belongs to single point dynamic navigation positioning. Its positioning accuracy is about 100M. In order to improve the positioning accuracy, differential GPS technology can be used.

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