Types of GPS

　　There are many types of GPS satellite receivers, which are divided into geodetic type, total station type, timing type, handheld type and integrated type according to the model; according to the application, they are divided into vehicle type, shipborne type, airborne type, spaceborne type and bomb-borne type. .

　　Classification according to the purpose of the receiver

　　1. Navigation receiver

　　This type of receiver is mainly used for the navigation of the moving carrier, it can give the position and speed of the carrier in real time. This type of receiver generally uses C/A code pseudorange measurement, and the single-point real-time positioning accuracy is low, generally ±25mm, and ±100mm when there is an SA influence. Such receivers are inexpensive and widely used. Depending on the field of application, such receivers can be further divided into:

　　Vehicle type - used for vehicle navigation and positioning;

　　Nautical type - used for ship navigation and positioning;

　　Aviation type - used for aircraft navigation and positioning. Due to the high speed of the aircraft, receivers used in aviation are required to be able to adapt to high-speed motion.

　　Satellite type - used for satellite navigation and positioning. Since the speed of the satellite is as high as 7km/s or more, the requirements for the receiver are higher.

　　2. Geodetic receivers

　　Geodetic receivers are mainly used for precision geodetic surveys and precision engineering surveys. This type of instrument mainly uses carrier phase observations for relative positioning, and has high positioning accuracy. The structure of the instrument is complicated and the price is more expensive.

　　3. Timing receiver

　　This type of receiver mainly uses the high-precision time standard provided by GPS satellites for timing, and is often used for time synchronization in astronomical observatories and radio communications.

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