GPS system consists of empty constellation, user receiving equipment, wireless data communication equipment and ground monitoring and adjustment equipment. The empty constellation is 24 satellites launched by the United States, operating in six quasi-synchronous orbits of 22,000 kilometers. It can cover the whole world, and these 24 satellites send out global, all-weather, three-dimensional, real-time cutting-edge, high-precision satellite navigation and positioning signals. As long as the user's receiving device needs to receive signals from three of the 24 satellites, it can determine accurate data on the receiver's location. These data information are transmitted to the commissioning command center through the wireless data transmission system, and the equipment in the commissioning command center conducts data analysis and processing. on the electronic map. Because the GPS system can provide global, all-weather, three-dimensional, real-time continuous, high-precision satellite navigation and positioning, and has good confidentiality, low cost, and convenient use, the United States, Britain, France, Germany, Japan, Canada, Switzerland, Denmark, Israel, etc. The country has begun to develop and produce GPS user equipment on a large scale, and make it develop in the direction of miniaturization, low power consumption and low cost. With the improvement of GPS technology, the vehicle positioning system will become an indispensable technical means to improve the level of urban travel and road services.

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