GPS system can be said to be the earliest, most mature and widely used positioning technology. The full English name of GPS is "Navigation Satellite Timing Ranging/Global Position System, that is, satellite time measuring and ranging navigation/global positioning system. The United States began to develop the GPS system in the 1970s. This system, which lasted 20 years and cost 20 billion dollars, was built in 1994. The system is provided with location information services by 24 satellite groups located in space. These 24 satellites are evenly distributed on six orbital planes and orbit the earth in a cycle of 11 hours and 58 minutes, The orbital inclination of the satellite's orbital plane relative to the Earth's equatorial plane is 55 °. The purpose of this layout is to ensure that at least four satellites can be observed at any place and at any time in the world.

　　GPS system is a new generation of satellite navigation and positioning system with real-time three-dimensional navigation and positioning capability in sea, land and air. Its positioning error can be controlled within 10m. After more than ten years of use by many professional departments around the world, GPS has the remarkable characteristics of all-weather, high-precision, automation, and high efficiency. Today, the GPS client receiver is shrinking in size, and the accuracy of the client is getting higher and higher, even in some high-end mobile phones, laptops and other electronic products. The popularity of GPS clients has accelerated the application of GPS positioning technology in the commercial field. While creating huge commercial profits, it is also gradually changing the lifestyle of modern humans.

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