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:
Last article:GPS navigation function
Related Information
4G GPS Tracker supplier
2023-04-23fleet gps trackers price
2023-04-23Cantrack G05
2023-03-16Vehicle tracking device
2023-03-16car gps tracker manufacture
2023-04-23OBD GPS Tracker sales
2023-03-164G LTE gps tracker
2023-04-11simple gps tracking
2023-04-11cat gps tracker
2023-04-11real-time gps tracking wholesale
2023-04-23G500M-Mini GPS Tracker
2022-06-203 Years Disposable Asset GPS Tracker
2025-03-31GF30 Magnet GPS tracker with Voice listen
2022-06-21G05N Vehicle Tracker
2022-06-21NB20 -4G Bluetooth Smart Pet Tracker
2022-06-21What is the function of gps tracker.mileage tracking webfleet solutions
2023-03-13GPS indoor positioning technology
2022-08-12GPS military application introduction.realtime gps tracker online supplier
2023-05-06What is GPS dual -frequency positioning technology?obd-II port gps tracker Manufacturing
2023-03-11GPS pseudo -distance measurement introduction.car gps tracker supplier
2023-04-19The GPS navigation function is diverse. Let's take a closer look at the GPS navigation voice prompt
2023-04-14Selection of GPS hardware architecture
2022-12-08Various GPS systems.4G GPS Tracker for vehicles Production
2023-08-22What is the application range of the car positioner?realtime gps tracker online manufacturer
2023-03-09GPS data reception
2022-10-27gps vehicle tracker.How to Implement Global Positioning System
2023-11-16Beidou Satellite Positioner.hang tag button manufacture
2023-06-06The car GPS positioner plug -in card is still free of card.van tracker webfleet solutions
2023-03-14The Development of GPS in the New Century
2022-09-24Bluetooth GPS.obd2 gps tracker verizon sales
2023-08-03