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:
Can the car GPS locator work normally in a special environment?gps tracker no monthly fee manufactur
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
gps vehicle tracker custom
2023-04-23car gps tracker wholesale
2023-04-23car gps tracker Production
2023-04-23car gps tracker manufacture
2023-04-23portable gps tracker
2023-04-11gps tracker auto price
2023-04-11gps vehicle tracker distributors
2023-04-23simple gps tracking company
2023-04-23pet gps tracker cat custom
2023-04-23gps tracker for kids
2023-03-16G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19G500M-Mini GPS Tracker
2022-06-20GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07NB20 -4G Bluetooth Smart Pet Tracker
2022-06-21GF20-Mini Magnet GPS Tracker
2022-06-21Frequently problem solving of GPS positioner.realtime gps tracker online distributors
2023-03-09How to realize the function of GPS monitoring system?
2022-12-12The main features of the GPS vehicle positioning system.gps tracker for trailer Manufacturing
2023-03-28GSP composition features
2022-08-01GPS Application Solution
2022-10-09The car GPS positioner plug -in card is still free of card.van tracker webfleet solutions
2023-03-14What are GPS in aviation flight navigation.gps tracker for trailer distributors
2023-04-10How will a drone without a GPS tracker orient and return to its base?
2022-09-13The advantages of "Galileo" GPS positioning system
2023-02-11Introduction to the application of GPS in emergencies.gps tracker no monthly fee Processing
2023-05-06What basic functions should Beidou positioning equipment have.Gps speed limiter
2023-10-10This section describes GPS working modes
2022-11-01The reasons and solutions for the slow reaction of the GPS screen.realtime gps tracker online Soluti
2023-05-06The function of the car GPS.gps tracker no monthly fee wholesaler
2023-05-13How to choose the antenna module of the car GPS positioner?Best hidden gps trackers
2023-03-22