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
4G GPS Tracker for vehicles
2023-04-114G GPS Tracker custom
2023-04-23obd2 tracker
2023-03-164G GPS Tracker for vehicles maker
2023-04-23Gps speed limiter Processing
2023-04-23Dog gps tracker manufacture
2023-04-23Dog gps tracker sales
2023-04-23fleet gps tracking wholesale
2023-04-23real-time gps tracking Processing
2023-04-23gps vehicle tracker Manufacturing
2023-04-23TK100N- Multi functional GPS Tracker
2023-10-06G500M-Mini GPS Tracker
2022-06-20TK100B- Accurate Pro version GT06/TK100
2023-10-06G06L
2022-06-21G05N Vehicle Tracker
2022-06-21Compared with wired GPS positioner and wireless GPS positioner.gps tracker for trailer manufacturer
2023-04-10Da GPS tells how to prevent car theft
2022-08-25The relationship between GPS and Beidou navigation?Asset tracking wholesaler
2023-02-18GPS user equipment
2023-06-01The reason why it is an important navigation that it is inseparable.realtime gps tracker online Prod
2023-04-25gps vehicle tracker.The role of installing GPS satellite positioning devices in the sales and leasin
2023-10-27Japan develops global positioning system independently
2022-09-05Application in emergencies GPS.plug & play Obd gps tracker Production
2023-05-06Car GPS Global Positioning System
2023-02-09The main uses of GPS
2022-10-10GPS military application introduction.realtime gps tracker online supplier
2023-05-06mini gps tracker.Installation and usage methods for automotive GPS locators
2023-11-08gps vehicle tracker.Accurate and inaccurate vehicle mileage statistics by GPS/Beidou satellite posit
2023-10-18How should a car loan company choose a reasonable car GPS locator?obd2 gps tracker verizon
2023-03-24GPS promotion direction.fleet gps trackers Processing
2023-07-03