source:Industry News release time:2022-07-23 Hits: Popular:realtime gps tracker online
24 GPS satellites operate at an altitude of 20,200 kilometers above the ground, making it possible to observe more than 4 satellites simultaneously at any point on the ground at any time.
Since the position of the satellites is accurate, we can obtain the distance from the satellite to the receiver in GPS observation. Using the distance formula in the three-dimensional coordinates and using three satellites, three equations can be formed to solve the position of the observation point (X , Y, Z). Considering the error between the satellite's clock and the receiver's clock, there are actually 4 unknowns, X, Y, Z and the clock difference, so it is necessary to introduce a fourth satellite to form 4 equations to solve, so as to obtain the observation point's Latitude and longitude and elevation.
In fact, the receiver can often lock more than 4 satellites. At this time, the receiver can be divided into several groups according to the constellation distribution of the satellites, each group has 4 satellites, and then the group with the smallest error is selected by the algorithm for positioning, thereby Improve accuracy.
Due to errors in satellite orbits and satellite clocks, the influence of the atmospheric troposphere and ionosphere on signals, and the artificial SA protection policy, the positioning accuracy of civilian GPS is only 100 meters. In order to improve the positioning accuracy, differential GPS (DGPS) technology is generally used to establish a base station (differential station) for GPS observation, and use the known precise coordinates of the base station to compare with the observed value to obtain a correction number and publish it to the outside world. . After receiving the correction number, the receiver compares it with its own observation value, eliminates most of the errors, and obtains a relatively accurate position. Experiments show that using differential GPS, the positioning accuracy can be improved to 5 meters
Read recommendations:
4G GPS Tracker for vehicles wholesaler
Last article:GPS navigation function
Related Information
best gps tracker
2023-04-11simple gps tracking Production
2023-04-23mini gps tracker Solution
2023-04-23Pet GPS Tracker sales
2023-04-11Pet GPS Tracker
2023-04-11real-time gps tracking
2023-04-11gps vehicle tracker custom
2023-04-11gps tracker no monthly fee
2023-04-23Gps speed limiter custom
2023-04-23car gps tracker Factory
2023-04-23G08L - 4inch Smart Tail Light Tracker
2022-06-20TK100 (GT06) Vehicle Tracker
2022-06-20TK200AM-Disposable GPS Tracker
2022-06-21personal gps tracker Production
2022-09-06G200(L) -Magnet GPS Tracker
2022-06-20GPS navigator component-global positioning system
2023-05-16How to design an excellent personal GPS satellite locator
2023-02-21Accuracy of GPS
2022-12-28How to use the Beidou GPS positioner.plug & play Obd gps tracker Processing
2023-04-14The development of GPS system
2022-10-12Do I need to pay information for using GPS?
2022-10-10Why is the GPS tracker inaccurate?
2022-09-16The application of 4GGPS positioning system in vehicle management.obd2 gps tracker verizon distribut
2023-03-28GPS system space part
2023-02-03How to install and use the car GPS positioner
2023-02-14GPS receiver.gps tracker no monthly fee distributors.gps tracker no monthly fee ufacturer
2023-04-13GPS positioning monitoring system
2022-12-06GPS mobile phone positioning characteristics
2022-10-21GPS reset did not have a substantial impact on car GPS locators
2023-09-04Introduce the different types of GPS positioner
2023-02-25