There are many kinds of GPS satellite receivers, which can be divided into geodesic, total station, timing, handheld and integrated types according to their models; It can be divided into vehicle mounted, ship mounted, airborne, satellite mounted and missile mounted according to its use.

　　After more than 20 years of practice, it has been proved that the GPS system is a high-precision, all-weather and global radio navigation, positioning and timing multi-function system. GPS technology has developed into an international high-tech industry with multiple fields, modes, purposes and models.

　　◆ On board GPS

　　When a GPS positioning terminal is made of hardware and software for vehicle positioning, it is called on-board GPS, but positioning alone is not enough. We also need to transmit the positioning information to the alarm center or the vehicle GPS holder, which is called the third party. Therefore, the GPS positioning system also includes GSM network communication (mobile phone communication), which sends the satellite positioning information to the third party by SMS. The short message message is interpreted by the microcomputer, and the vehicle position is displayed on the electronic map. In this way, vehicle GPS positioning is realized. At the same time, install the corresponding detection sensor on the vehicle, and use the GSM network communication function of vehicle GPS positioning to send the anti-theft alarm information to a third party, or send the alarm phone and short message directly to the owner's mobile phone to complete the vehicle GPS anti-theft alarm. It can be seen here that the GSM network part of vehicle GPS positioning is actually a smart phone, which can communicate with a third party, and can also send information such as the vehicle being robbed, the driver being hijacked, or kidnapped to a third party. Therefore, vehicle GPS positioning is positioning, anti-theft and anti-theft.

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