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:
personal gps tracker wholesaler
portable gps tracker wholesaler
G183 serials -JOBD GPS Tracker
GPS coordinates.gps tracker for trailer wholesaler
The manufacturer believes how to effectively prevent the vehicle positioning system from being destr
Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology
Next article:GPS Tracker.Application of GPS module
Related Information
simple gps tracking custom
2023-04-23plug & play Obd gps tracker
2023-04-114G GPS Tracker for vehicles sales
2023-04-23Car gps tracking Processing
2023-04-23pet gps tracker cat Factory
2023-03-16vehicle gps tracker manufacturer
2023-03-16Car gps tracking Production
2023-04-23mini gps tracker wholesale
2023-04-23car gps tracker Manufacturing
2023-04-23portable gps tracker distributors
2023-03-16YG119- Hunting Dog GPS tracker
2023-10-07TK100N- Multi functional GPS Tracker
2023-10-06G900LS 8 Lines-4G Car GPS Tracker
2025-03-31G183 serials -JOBD GPS Tracker
2022-09-06G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19What are the types of driving recorders?GPS Tracker for vehicles Manufacturing
2023-04-14How to maintain the GPS locator of the car.gps tracker with magnet Manufacturing
2023-03-28GPS positioning logistics solutions Logistics GPS positioning application solutions
2022-10-09What are the main parts of the receiver of the car GPS
2023-06-15Brief introduction of GPS control part
2022-09-22Does gps tracker cost traffic?
2022-09-15What is the difference between the car GPS positioner and the car navigator?gps tracker für auto web
2023-03-21GPS satellite error.realtime gps tracker online manufacturer
2023-04-23What cards do car GPS positioners generally use
2023-03-07Basic architecture of GPS receiver
2022-10-15Beidou Satellite GPS Trajectory.gps tracker no monthly fee distributors
2023-08-18GPS management system-efficient management of your vehicle
2023-02-16Development and Prospects of GPS Chips.gps tracker no monthly fee Processing
2023-08-15The difference between GPS positioning and base station positioning.GPS Tracker for vehicles Process
2023-05-09What is the GPS program of Gully?
2023-02-11