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:
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
portable gps tracker wholesaler
2023-03-16Pet GPS Tracker wholesale
2023-03-16gps vehicle tracker Processing
2023-04-114G GPS Tracker for vehicles Manufacturing
2023-04-23Magnetic gps tracker wholesaler
2023-03-16gps tracker device Factory
2023-04-23pet gps tracker cat Manufacturing
2023-03-16simple gps tracking Production
2023-04-23GPS Trackers Factory
2023-04-11gps vehicle tracker manufacturer
2023-04-23G200(L) -Magnet GPS Tracker
2022-06-2010000mAh Magnetic Asset GPS Tracker
2025-04-086000mAh Magnetic Asset GPS Tracker
2025-03-31TK200AM-Disposable GPS Tracker
2022-06-21G900LS J16-4G Car GPS Tracker
2023-10-06The difference between GPS positioning and base station positioning.GPS Tracker for vehicles Process
2023-05-09Beidou Navigation system-GPS system composition and working principle
2022-10-20GPS navigation function
2022-07-23How to purchase GPS locators?
2023-02-21What is the relationship between car-hailing and gps locator?
2022-07-18GPS positioning technology
2022-11-24Fleet management.Analysis of users' demand for monitoring services of car GPS positioning systems
2023-11-03Introduce how to use the car navigation instrument.gps tracker with magnet distributors
2023-05-10What are the advantages of electric vehicle GPS positioner?
2023-04-03With GPS positioning function police smart clothing
2023-02-09Principles of GPS system positioning.Magnetic gps tracker company.gps tracker for Car supplier
2023-07-13Composition and Application of GPS.gps tracker app distributors
2023-07-04Development Trend of Automobile GPS Positioning System
2022-12-07GPS topographic mapping.pet gps tracker cat Solution
2023-07-03Analysis of GPS Antenna Principle
2022-08-18