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:
VSL100 GPS Speed Limiter, Speed Governor
Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology
Next article:GPS Tracker.Application of GPS module
Related Information
real-time gps tracking supplier
2023-04-23Asset GPS Tracker
2023-03-16gps vehicle tracker wholesaler
2023-04-11Gps speed limiter Vendor
2023-04-23gps vehicle tracker Solution
2023-04-11Hidden GPS Trackers supplier
2023-04-23GPS Trackers Factory
2023-04-114G GPS Tracker supplier
2023-04-23pet gps tracker cat Factory
2023-03-16Dog gps tracker Solution
2023-04-23TK103B
2022-06-20G900LM-4G Car Mini GPS Tracker
2025-03-25GF20-Mini Magnet GPS Tracker
2022-06-21G900LM J16-4G Car GPS Tracker
2025-03-25G900LS 8 Lines-4G Car GPS Tracker
2025-03-31The role of UAV GPS module
2022-10-13How to buy a car GPS locator?rastreador de GPS Production
2023-03-15GPS position difference principle
2022-10-11GPS receiver classification.realtime gps tracker online distributors
2023-04-23GPS navigation solution
2022-12-10Why is the GPS tracker inaccurate?
2022-09-16Development of GPS Continuous Operation Station Network and Integrated Service System.gps tracker no
2023-08-14The application of GPS in the traffic system.plug & play Obd gps tracker Manufacturing
2023-04-23Beidou 4G wiring GPS positioner installation precautions.realtime gps tracker online Processing
2023-03-28Car GPS Application Notes
2022-08-24GPS maintenance.obd2 gps tracker verizon maker
2023-06-09The concept of static drift of the car GPS positioner and cause.plug & play Obd gps tracker manu
2023-03-25GPS forward direction (heading).gps tracker for bike wholesale
2023-06-10How to design an excellent personal GPS satellite locator
2023-02-21GPS network time server.Gps speed limiter manufacture
2023-05-27