source:Industry News release time:2022-07-21 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:
Application in GPS tourism.plug & play Obd gps tracker Processing
Last article:GPS navigation function
Next article:Introduction to GPS Navigation
Related Information
Gps speed limiter maker
2023-04-23gps vehicle tracker
2023-04-11Cantrack Login
2023-04-11fleet gps tracking supplier
2023-04-23gps vehicle tracker custom
2023-04-11Gps speed limiter custom
2023-04-23gps vehicle tracker distributors
2023-04-11Dog gps tracker Factory
2023-04-23simple gps tracking Solution
2023-04-23Dog gps tracker wholesale
2023-04-23personal gps tracker Production
2022-09-06GF30 Magnet GPS tracker with Voice listen
2022-06-21TK103B
2022-06-20G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19GF20-Mini Magnet GPS Tracker
2022-06-21Car GPS Global Positioning System
2023-02-09How to help the GPS positioner help take care of the elderly and children?Car gps Solution
2023-02-18What should I do if I encounter an offline alarm in the car GPS positioner?realtime tracking device
2023-03-24What are the information methods sent by GPS reference stations.gps tracker app Manufacturing
2023-06-14What's the point of having a gps tracker in a car?
2022-07-15How to determine whether the car is equipped with a GPS positioner?trailer gps tracker Manufacturing
2023-03-17Overview of GPS Clock.OBD GPS Tracker manufacturer
2023-07-18GPS Tracking Monitoring Promotes Mobile Logistics Management
2022-12-30School bus GPS positioning and 3G wireless video monitoring management.Magnetic gps tracker Factory
2023-07-10Actual demand and development trend of GPS market
2022-12-22Principles of GPS system positioning.Magnetic gps tracker company.gps tracker for Car supplier
2023-07-13Composition of GPS clock system.portable gps tracker company
2023-07-07Dual GPS frequency positioning, improve accuracy.Portable car gps systems distributors
2023-03-11GPS Earth Coordinate Series Brief description
2023-02-10GPS positioning system prospects
2023-06-02