What are the classifications of GPS
navigators
Classification by receiver usage
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 ??10m, and ??100m when there is SA influence. Such receivers are inexpensive and widely used. According to different application fields, 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.
Because of the high speed of the aircraft, the receivers used in aviation are required to be able to adapt to high-speed motion.
Satellite – 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 the carrier phase observation value for relative positioning, and the positioning accuracy is high. The structure of the instrument is complicated and the price is more expensive.
3. Timing receivers
These receivers mainly use the high-precision time standard provided by GPS satellites for timing, and are often used for time synchronization in observatories and radio communications.
By receiver carrier frequency
Single frequency receivers
Single frequency receivers Only the L1 carrier signal can be received, and the carrier phase observation value can be measured for positioning. Since the effect of ionospheric delay cannot be effectively eliminated, single-frequency receivers are only suitable for short baselines (