source:truck tracking webfleet solutions release time:2024-03-04 Hits: Popular:realtime gps tracker online

Roughly speaking, the ground coordinates and their conventional geographic features (i.e. spatial resection) are obtained by measuring the distance from an in orbit satellite (which determines it to be a known data) to a ground point. Because the position variables in the equation include XYZ and clock deviation T, the number of accepted satellites must be greater than or equal to 4.
In the positioning process, there are two methods to obtain the pseudorange (i.e. the distance with errors) from the satellite to the ground: 1. ranging code; 2. Carrier phase.
1. The ranging code belongs to pseudo-random noise code, which is a binary code sequence. The key is to measure the time difference between the transmitted signal and the received signal, which is obtained through atomic clock synchronization. Due to the refraction of the carrier wave carrying the ranging code when passing through the current layer, ionospheric errors are generated. Solar activity has an impact on the total electron density of the ionosphere, so it can also have an impact on GPS positioning. According to our teacher, there was a period of time when GPS could not be used due to solar flares.
2. If a satellite S emits a carrier model (which is used as a ranging signal here), the signal propagates to various places. At a certain moment, the phase of the signal at receiver R is ψ R. At satellite S ψ S. Note that what is mentioned here is ψ R, ψ S is the complete carrier phase, including the entire number of cycles, calculated from the same starting point. The distance between the satellite and the ground ρ=λ ( ψ S- ψ R) .
As can be seen from the above, if the corresponding phase number is inaccurate or cannot be directly obtained, then GPS will not work. In addition, during the measurement process, if the altitude angle of the satellite (the angle between the satellite and the ground level) is too small, it is also impossible to perform measurement and positioning. In summary, during the measurement period, there were no four or more satellites, the altitude angle was too small, there were obstructions such as high-rise buildings, intense solar activity, the position and operation of satellites in orbit, and the condition of the receiver may all cause GPS to be unable to locate or inaccurate.
Read recommendations:
GPS Tracker for vehicles Manufacturing
The GALILEO GPS system consists of 10 signals in four frequency bands.
Why do the antennas need to be facing up when installing a GPS tracker?
Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology
Next article:GPS Tracker.Application of GPS module
Related Information
4G GPS Tracker for vehicles
2023-03-16Magnetic gps tracker Vendor
2023-04-23GPS Trackers price
2023-04-11pet gps tracker cat Vendor
2023-03-16real-time gps tracking Vendor
2023-04-23gps vehicle tracker sales
2023-04-23GPS Tracker price
2023-04-11plug & play Obd gps tracker
2023-04-11gps tracker app
2023-04-11gps vehicle tracker Production
2023-04-2310000mAh Magnetic Asset GPS Tracker
2025-04-08G183 serials -JOBD GPS Tracker
2022-09-06TK08AL- RFID Car GPS Tracker
2023-10-07P02L Smart Walkie-Talkie Tracker
2025-09-196000mAh Magnetic Asset GPS Tracker
2025-03-31GPS indoor positioning application
2023-02-15GPS Capabilities
2022-12-28The historical development of GPS in the 20th century
2023-02-10GPS flat antenna
2022-11-23Little White-fronted Goose No. 12 spent nearly 4 months in the summer breeding season near the Berin
2022-09-17GPS automatic gain control system
2022-11-17The advantage of mobile phone GPS navigation.GPS Tracker for vehicles Production
2023-05-09Introduction to GPS positioning tracker
2022-12-15Whether GPS positioning is GPS navigation.obd-II port gps tracker manufacture
2023-05-09Typical GPS Clock Products.Hidden GPS Trackers supplier
2023-07-18How to choose the installation location of the wireless GPS positioner?4G GPS Tracker for vehicles
2023-03-22GPS uses traditional paper maps to find its location.realtime gps tracker online manufacturer.obd2 g
2023-04-13gps vehicle tracker.What's wrong with the inaccurate positioning of the ultra long standby GPS locat
2023-10-11Three Parts of GPS
2022-11-01Gps speed limiter.Why do operating vehicles need to install a Beidou satellite positioning and drivi
2023-10-26