source:truck tracking webfleet solutions release time:2024-01-17 Hits: Popular:realtime gps tracker online
To understand the principle of positioning, first popularize what GPS is. GPS (Global Positioning System) is a new generation satellite navigation and positioning system developed by the United States in the 1970s and fully completed in 1994. It has the function of real-time three-dimensional navigation and positioning in all directions at sea, land, and air. The system consists of three parts: the space part (GPS satellite), the ground monitoring part, and the user part. There are a total of 24 satellites in the space section, of which 21 are working satellites and 3 are backup satellites, distributed in 6 orbits at an angle of 60 ° to each other. The distribution of satellites allows for the observation of more than 4 satellites anywhere and at any time in the world, and maintains a geometric shape with good positioning accuracy. This provides continuous global navigation capabilities over time.
Our mobile end belongs to the user part of the GPS system, and its built-in GPS module only has the receiving function, not the transmitting function. GPS satellites are equipped with high-precision cesium atomic clocks to ensure the accuracy of time synchronization. The satellite continuously transmits carrier signals to the Earth, which modulate broadcast ephemeris and timestamps representing the satellite's position, as well as C/A and P codes used for ranging. The C/A code is coarse and is generally used for civilian use, while the P code is fine and not easily interfered with. It is used for military use.
After the GPS module on the mobile phone receives the GPS signal, the time difference △ t can be obtained by comparing the timestamp in the navigation message with the current time in the device. The speed of electromagnetic waves v is the same as the speed of light propagation, and v multiplied by △ t to obtain the distance between the mobile phone and the GPS satellite (the receiver satellite clock has certain errors and atmospheric propagation errors, and the measured distance is also known as pseudorange), Each GPS terminal can simultaneously obtain navigation messages from at least 4 satellites. By using the method of spatial distance resection, we can calculate the three-dimensional position and other information of the mobile terminal, so that we can understand our current position on the mobile terminal.
Read recommendations:
gps vehicle tracker manufacturer
Last article:4G GPS Tracker.There are four mainstream satellite systems worldwide
Next article:Gps speed limiter.The application advantages of GPS measurement technology
Related Information
vehicle gps tracker
2023-04-11Car gps tracking price
2023-04-11Dog gps tracker wholesale
2023-04-23gps vehicle tracker manufacturer
2023-04-23gps vehicle tracker maker
2023-04-23gps vehicle tracker Solution
2023-04-23GPS Tracking custom
2023-04-11pet gps tracker cat manufacturer
2023-03-16portable gps tracker
2023-04-11cat gps tracker wholesaler
2023-04-23G900LS 8 Lines-4G Car GPS Tracker
2025-03-31P02L Smart Walkie-Talkie Tracker
2025-09-19G183 serials -JOBD GPS Tracker
2022-09-066000mAh Magnetic Asset GPS Tracker
2025-03-31Mini Sized GPS Tracker PCBA
2022-06-17GPS guidance (Bearing)
2022-11-23Overview of GPS Vehicle Positioning System
2022-07-12What is the effect of a manufacturer sharing the car positioner?plug & play Obd gps tracker whol
2023-04-14What is GPS location time?
2022-10-26GPS predecessor
2023-06-01GPS positioning anti lost device comparison.gps tracker auto webfleet solutions
2023-02-24Positioning accuracy of GPS module
2023-02-03GPS mobile phone positioning principle
2022-10-21GPS receiving antenna
2022-09-27GPS locator function.Magnetic gps tracker Solution
2023-06-21Which vehicles are the on-board GPS locator terminals applied to.gps vehicle tracker
2023-10-07Car GPS system
2023-02-09How to apply GPS positioner to view the location of the electric vehicle
2023-03-06What does the gps fee for buying a car mean?
2022-08-12GPS flat antenna
2022-11-23