The GPS system consists of four parts: space constellation, user receiving equipment, wireless data communication equipment, and ground monitoring and control equipment. The space constellation is 24 satellites launched by the United States and operating in six quasi Synchronous orbit over 22000 kilometers. It can cover the world, and these 24 satellites can provide global, all-weather, three-dimensional, real-time border and high-precision satellite navigation and positioning signals. The user receiving device only needs to receive signals from three of the 24 satellites to determine the accurate data of the receiver's location. This data information is transmitted to the control and command center through a wireless data transmission system, and is analyzed and processed by the equipment in the control and command center. It is also configured through a geographic information system and a high-resolution electronic display in the central system, Display the real-time location of the user's receiver on an electronic map. Due to the ability of GPS systems to provide global, all-weather, three-dimensional, real-time, continuous, and high-precision satellite navigation and positioning, as well as good confidentiality, low cost, and convenient use, countries such as the United States, the United Kingdom, France, Germany, Japan, Canada, Switzerland, Denmark, Israel, etc. have begun to develop and produce GPS user equipment on a large scale, and have made it develop towards miniaturization, low power consumption, and low cost. With the increasing improvement of GPS technology, vehicle positioning systems will become an indispensable and important technical means to improve urban transportation and improve road service levels.

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