source:truck tracking webfleet solutions release time:2023-04-13 Hits: Popular:realtime gps tracker online
The GPS receiver can receive time information accurate to nanoseconds that can be used for time service; The forecast ephemeris used to forecast the approximate position of the satellite in the coming months; The broadcast ephemeris used to calculate the satellite coordinates required for positioning, with an accuracy of several meters to tens of meters (different satellites, changing at any time); And GPS system information, such as satellite status.
The distance from the satellite to the receiver can be obtained by measuring the code of the GPS receiver. Because of the error of the receiver's satellite clock and atmospheric propagation error
Poor, so it is called pseudo distance. The pseudo range measured for 0A code is called UA code pseudo range with an accuracy of about 20 meters, and the pseudo range measured for P code is called P code pseudo range with an accuracy of about 2 meters.
The GPS receiver decodes the received satellite signals or uses other technologies to remove the information modulated on the carrier wave
Recover the carrier. Strictly speaking, the carrier phase should be called the carrier beat phase, which is the difference between the carrier phase of the received satellite signal affected by Doppler frequency shift and the signal phase generated by the local oscillation of the receiver. Generally, the phase change value can be recorded by measuring at the epoch time determined by the receiver clock and keeping track of the satellite signal. However, the initial phase value of the receiver and satellite oscillator at the beginning of the observation is unknown, and the phase integer of the initial epoch is also unknown, that is, the integer ambiguity can only be calculated as a parameter in data processing. The accuracy of the phase observation value is as high as mm, but the premise is to solve the ambiguity of the whole cycle. Therefore, the phase observation value can only be used when there is a relative positioning and a continuous observation value, and the phase observation value can only be used to achieve the positioning accuracy better than the meter level.
According to the positioning mode, GPS positioning is divided into single point positioning and relative positioning (differential positioning). Single point positioning is a way to determine the position of a receiver based on the observation data of a receiver. It can only use pseudo range observation measurement, which can be used for rough navigation and positioning of vehicles and ships. Relative positioning (differential positioning) is a method to determine the relative position between observation points based on the observation data of more than two receivers. It can use either pseudo range observation or phase observation. Geodetic or engineering measurements should use phase observation values for relative positioning.
Read recommendations:
pet gps tracker cat wholesaler
fleet solution webfleet solutions
TK100B- Accurate Pro version GT06/TK100
How to find the GPS locator on the car?obd2 gps tracker verizon supplier
Last article:GPS cannot search for satellite signal problems.plug & play Obd gps tracker distributors
Next article:The strategic role of GPS satellite positioning system and commercial interests.gps tracker no month
Related Information
Hidden GPS Trackers
2023-04-11GPS Tracker company
2023-04-11fleet gps trackers
2023-04-11pet gps tracker cat
2023-03-16obd2 tracker
2023-03-16obd2 gps tracker verizon
2023-04-11car gps tracker supplier
2023-04-23fleet gps trackers company
2023-04-23Cantrack G05
2023-03-16obd2 tracker wholesale
2023-03-16TK200AM-Disposable GPS Tracker
2022-06-21TK08AL- RFID Car GPS Tracker
2023-10-07G900LS-4G Car GPS Tracker
2023-10-06G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19G183 serials -JOBD GPS Tracker
2022-09-06What to do if the GPS positioning speed is slow.plug & play Obd gps tracker Solution
2023-04-08GPS receiving antenna
2022-09-27Introduction to the principle of Beidou positioning by positioning manufacturers.gps tracker for tra
2023-06-20How can the GPS positioner prevent electric vehicles from being stolen?plug & play Obd gps track
2023-03-17GPS locators can be used as a source of real-time information on road conditions
2022-07-19The principle of GPS is introduced to you
2022-11-19The development of electronic maps.personal gps tracker Manufacturing
2023-05-17GPS Automotive navigation system.gps tracker device Solution
2023-07-24Development Trend of Automobile GPS Positioning System
2022-12-07Twelve problems commonly used in car GPS positioner.gps tracker für auto webfleet solutions
2023-03-09Brief analysis of problems and solutions of vehicle location tracker.realtime gps tracker online Pro
2023-03-13GPS monitoring system system function and characteristics
2023-02-11GPS positioning principle
2022-11-26GPS satellite positioning is an inevitable trend
2023-02-23What are the functions of breeding solar GPS positioning
2023-02-23