It is a terminal equipped with a built-in GPS module and a mobile communication module, used to transmit the positioning data obtained by the GPS module to a server on the Internet through a mobile communication module (gsm/gprs network), so that the terminal location can be queried on a computer or mobile phone.

　　There are basically two types of GPS positioning devices installed in the car, magnetic and wired. Magnetic devices are basically composed of built-in batteries and strong magnets, with the advantage of easy installation and relying on magnets to adsorb anywhere on the body shell. The disadvantage is that the battery usage is limited, and there will always be times when it runs out of power. Another type is wired, which is directly connected to the power line inside the car.

　　The spatial distribution of GPS is composed of 24 GPS working satellites, which together form the GPS Satellite constellation, of which 21 are available for navigation and 3 are active standby satellites. These 24 satellites are distributed in 6 orbits with an inclination angle of 55 ° and orbit the Earth. The operation period of the satellite is about 12 Sidereal time. Each GPS working satellite sends out signals for navigation and positioning. GPS users use these signals for their work.

　　There are basically two types of GPS positioning devices installed in the car, magnetic and wired. Magnetic devices are basically composed of built-in batteries and strong magnets, with the advantage of easy installation and relying on magnets to adsorb anywhere on the body shell. The disadvantage is that the battery usage is limited, and there will always be times when it runs out of power. Another type is wired, which is directly connected to the power line inside the car.

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