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
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:
Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology
Next article:GPS Tracker.Application of GPS module
Related Information
Car gps tracking price
2023-04-11GPS Trackers custom
2023-04-11Car gps tracking wholesale
2023-04-23Cantrack Login
2023-04-11gps tracker app
2023-04-11simple gps tracking company
2023-04-23gps vehicle tracker maker
2023-04-23obd2 tracker supplier
2023-03-16real-time gps tracking maker
2023-04-23gps tracker device Factory
2023-04-23P02L Smart Walkie-Talkie Tracker
2025-09-19G183 serials -JOBD GPS Tracker
2022-09-06NB20 -4G Bluetooth Smart Pet Tracker
2022-06-21G500L -4G OBD GPS Tracker
2022-09-06P60L Personal gps tracker
2022-06-21GPS module performance
2023-02-03Factors affecting GPS positioning accuracy.gps tracker for trailer Production
2023-05-18How to buy GPS positioner.obd2 gps tracker verizon
2023-03-14What are the advantages of 4G positioner.realtime gps tracker online Production
2023-03-28Exploring China's Beidou Satellite Navigation and Positioning System
2022-08-23What will be affected by the accuracy of LBS positioning.gps tracker no monthly fee manufacturer
2023-03-10There are three parts to the GPS plan
2022-08-12Car GPS Navigation System
2022-11-04How to prevent the car positioning system from being destroyed.plug & play Obd gps tracker Solut
2023-05-09Logistics GPS positioning application scheme
2022-10-09GPS Capabilities
2022-12-28Centimeter -level high -precision 4G full Netcom GPS positioner.fleet management software webfleet s
2023-03-08Car GPS one click alarm.fleet gps tracking Solution
2023-07-21Car GPS positioning system.Gps speed limiter Production
2023-05-26How accurate is GPS positioning?
2022-10-26Related Articles

Firstly, let's take a look at why GPS locators are inaccurate and have large errors. GPS positioning accuracy, generally within 10 meters if obtaining Beidou or GPS signals; If it is a signal...

GPS differential positioning technology is an important method to improve the positioning accuracy of the Global Positioning System (GPS). In traditional GPS positioning, satellite signals are af...

Vehicle GPS Navigation System Vehicle mounted GPS navigation system is an indispensable and important device in modern automobiles, providing drivers with convenient and accurate navigation service...

Handheld GPS positioning device is a portable and practical positioning tool widely used in outdoor exploration, geological exploration, forestry investigation and other fields. Handheld GPS posi...

In modern society, high-precision GPS locators play a crucial role. It has brought many conveniences to people's lives and work with its excellent positioning accuracy and reliable performance...

Real time GPS tracker is an advanced technology device that can track target objects in real-time at any time and any place, bringing great convenience to people's lives and work. The core fu...