source:truck tracking webfleet solutions release time:2023-07-14 Hits: Popular:realtime gps tracker online
24 GPS satellites orbit the Earth at an altitude of 12000 kilometers above the ground in a 12 hour cycle, allowing for simultaneous observation of more than 4 satellites at any point on the ground at any time.
Due to the precise positioning of satellites, in GPS observations, we can obtain the distance from the satellite to the receiver. Using the distance formula in three-dimensional coordinates and using three satellites, we can form three equations to solve the positions of observation points (X, Y, Z). Considering the error between the satellite clock and the receiver clock, there are actually four unknowns, X, Y, Z, and clock difference. Therefore, a fourth satellite needs to be introduced to form four equations for solving, in order to obtain the longitude, latitude, and elevation of the observation point.
In fact, receivers can often lock in more than 4 satellites. In this case, the receiver can be divided into several groups based on the constellation distribution of the satellites, with 4 satellites in each group. Then, the algorithm selects the group with the smallest error for positioning, thereby improving accuracy.
Due to the errors in satellite orbit and satellite clock, the influence of atmospheric troposphere and ionosphere on signals, and the artificial SA protection policy, the positioning accuracy of civil GPS is only 100 meters. In order to improve positioning accuracy, differential GPS (DGPS) technology is commonly used to establish a reference station (differential station) for GPS observation. The known precise coordinates of the reference station are compared with the observed values to obtain a correction number, which is then released to the public. After receiving the correction number, the receiver compares it with its own observation values to eliminate most of the errors and obtain a more accurate position. Experiments have shown that using differential GPS, the positioning accuracy can be improved to 5 meters.
Read recommendations:
Positioner manufacturer tells the role of car GPS positioner.gps tracker for trailer Vendor
Last article:Principles of GPS system positioning.Magnetic gps tracker company.gps tracker for Car supplier
Next article:GPS mobile engineering mode.gps tracker device wholesale
Related Information
Magnetic gps tracker
2023-03-16gps tracker for Car
2023-04-11gps tracker device
2023-04-11mini gps tracker manufacturer
2023-04-234G GPS Tracker for vehicles manufacturer
2023-04-23fleet gps tracking price
2023-04-23Car gps tracking price
2023-04-11gps vehicle tracker Manufacturing
2023-04-11gps vehicle tracker price
2023-04-23Pet GPS Tracker Manufacturing
2023-03-16G05N Vehicle Tracker
2022-06-21YG119- Hunting Dog GPS tracker
2023-10-07GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07G900LS 8 Lines-4G Car GPS Tracker
2025-03-31G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19The development history of GPS
2022-08-12GPS Tracker Features and Benefits
2022-07-08Beidou GPS Navigation System - Future development
2022-10-20Main Errors in GPS Positioning and Their Elimination Algorithm
2022-12-10GPS_GPRS system composition and characteristics
2022-10-28Vehicle GPS positioner startup status classification description.gps tracker für auto webfleet solut
2023-03-28gps vehicle tracker.What is the price of a vehicle GPS locator
2023-11-09Car GPS.obd-II port gps tracker Processing
2023-05-13GPS application
2022-10-10Gps speed limiter.GLONASS Satellite Navigation System
2023-10-11What basic functions should Beidou positioning equipment have.Gps speed limiter
2023-10-10What are the classification of GPS system.gps tracker no monthly fee wholesale
2023-04-21Five requirements that a good GPS module must meet
2022-11-07mini gps tracker.The role of vehicle GPS satellite positioning system in logistics transportation
2023-11-02What kind of Bluetooth GPS do you choose?fleetmanagement webfleet solutions
2022-11-16