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:
G01 Smallest Personal Old People Mini GPS Tracker for Kids
GPS indoor positioning application
GPS monitoring system develops rapidly.Hidden GPS Trackers Manufacturing
Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology
Next article:GPS Tracker.Application of GPS module
Related Information
gps tracker fur auto webfleet solutions
2023-03-16gps tracker for kids
2023-04-11Gps speed limiter distributors
2023-04-23Hidden GPS Trackers wholesaler
2023-03-16real-time gps tracking
2023-03-16Car gps tracking
2023-04-11GPS Tracker supplier
2023-04-11fleet gps trackers Vendor
2023-04-234G GPS Tracker for vehicles Production
2023-04-234G GPS Tracker for vehicles sales
2023-04-23G900LM J16-4G Car GPS Tracker
2025-03-25YG119- Hunting Dog GPS tracker
2023-10-07TK08AL- RFID Car GPS Tracker
2023-10-07G900LS J16-4G Car GPS Tracker
2023-10-06VSL100 GPS Speed Limiter, Speed Governor
2022-06-19GPS positioning interactive service
2022-08-12What are the functions of the driving recorder?obd-II port gps tracker Manufacturing
2023-04-14GPS DOP and Active Satellites (GSA)
2022-09-28Where is the car GPS locator usually installed in a car?plug & play Obd gps tracker distributors
2023-03-25What are the functions of a car navigator?gps tracker no monthly fee wholesale
2023-04-11This product focuses on humanized design to minimize the false alarm rate.
2022-12-15The basic architecture and characteristics of GPS
2022-10-15GPS locator installation
2022-10-27Vehicle GPS
2022-12-08Shared bicycles require the installation of Beidou/GPS satellite positioning module.GPS Tracker
2023-09-22How to do car GPS positioning in a car rental company.obd2 gps tracker verizon distributors
2023-03-16Development Trend of Automotive GPS Positioning System
2022-08-26GPS management system-efficient management of your vehicle
2023-02-16Application of GPS
2022-09-24GPS power consumption and noise
2022-09-01