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:
4G GPS Tracker for vehicles Production
Where is the GPS positioner generally installed.gps tracker with magnet distributors
Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology
Next article:GPS Tracker.Application of GPS module
Related Information
portable gps tracker
2023-04-11Gps speed limiter distributors
2023-04-234G GPS Tracker for vehicles manufacturer
2023-04-23Cantrack G05
2023-04-11fleet gps trackers Factory
2023-04-23simple gps tracking Processing
2023-04-234G LTE gps tracker
2023-04-11car gps tracker Factory
2023-04-11gps tracker for bike
2023-04-11pet gps tracker cat Solution
2023-03-163 Years Disposable Asset GPS Tracker
2025-03-316000mAh Magnetic Asset GPS Tracker
2025-03-31GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07personal gps tracker Production
2022-09-06GF20-Mini Magnet GPS Tracker
2022-06-21Prison GPS Personnel Management Program
2022-08-23GPS installation step
2022-10-10What is GPS dual -frequency positioning technology?obd-II port gps tracker Manufacturing
2023-03-11GPS data
2022-10-22It is recommended to install at least two GPS locators for risk control practice
2022-07-15GPS navigator component-global positioning system
2023-05-16Classification of GPS antenna
2022-11-12The main error and elimination algorithm in GPS positioning
2023-02-10GPS positioning principle
2022-11-26GPS Logistics Tracking and Monitoring Application Solution
2023-02-02gps vehicle tracker.What are the installation requirements for GPS locators reflected in
2023-10-17GPS positioner helps logistics and transportation companies manage transparency and intelligence.obd
2023-03-28Three wiring line search methods for installing GPS positioner.realtime gps tracker online supplier
2023-04-11Twelve problems commonly used in car GPS positioner.gps tracker für auto webfleet solutions
2023-03-09How to connect the mobile phone of the Beidou GPS positioner?gps tracker no monthly fee wholesaler
2023-04-15