source:truck tracking webfleet solutions release time:2022-08-12 Hits: Popular:realtime gps tracker online
According to the geometric positioning principle of measuring navigation parameters, satellite navigation can be divided into angle measurement, time ranging, Doppler velocity measurement and combination method. Among them, the angle measurement method and combination method have no practical application due to low accuracy.
①Doppler speed measurement positioning: "Meridian" satellite navigation system adopts this method. The user positioning device measures the Doppler frequency shift curve according to the Doppler frequency shift between the frequency of the signal received from the navigation satellite and the frequency of the signal sent from the satellite, and the user's position can be calculated according to this curve and the satellite orbit parameters.
② Time ranging navigation and positioning: "Navigation Star" global positioning system adopts this system. The user receiving equipment accurately measures the propagation time of the signals sent by the four satellites in the system that are not in the same plane (to ensure unique results, the four satellites cannot be in the same plane), and then completes a set of model mathematical operations including four equations, The three-dimensional coordinates of the user's position and the error between the user's clock and the system time can be calculated.
The difference between the user's own geographic location coordinates measured by the navigation satellite and its real geographic location coordinates is called the positioning error, which is the most important performance index of the satellite navigation system. The positioning accuracy mainly depends on the orbit prediction accuracy, the navigation parameter measurement accuracy and its geometric amplification factor and the user dynamic characteristic measurement accuracy. The accuracy of orbit prediction is mainly affected by the Earth's gravitational field model and other orbital perturbations; the measurement accuracy of navigation parameters is mainly affected by the performance of satellites and user equipment, signal refraction in the ionosphere, troposphere and multipath and other error factors. Its geometric amplification factor is given by It is determined by the geometric relationship between the satellite and the user's position during positioning; the user's dynamic characteristic measurement accuracy refers to the user's heading, speed and antenna height measurement accuracy during positioning
Read recommendations:
gps tracker no monthly fee supplier
Principle of GPS indoor positioning technology
What are the cases of GPS positioner?gps tracker no monthly fee manufacturer
Last article:GPS indoor positioning technology
Next article:GPS Global Positioning System
Related Information
GPS Trackers sales
2023-04-11gps vehicle tracker manufacture
2023-04-11Car gps tracking manufacture
2023-04-23fleet gps trackers Processing
2023-04-23fleet gps tracking manufacture
2023-04-23real-time gps tracking company
2023-04-234G GPS Tracker for vehicles Factory
2023-04-23gps vehicle tracker maker
2023-04-23Pet GPS Tracker Manufacturing
2023-03-16fleet solution webfleet solutions
2023-03-16TK103B
2022-06-20G06L
2022-06-21personal gps tracker Production
2022-09-06GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19Intelligent GPS anti-theft electronic system
2022-08-26GPS positioning function
2022-12-10GPS Accessories FAQ
2022-08-08What to do if the GPS positioning speed is slow.plug & play Obd gps tracker Solution
2023-04-08GPS establishes network connection
2022-10-19The development of electronic maps.personal gps tracker Manufacturing
2023-05-17GPS satellites
2022-11-03Do I need to pay information for using GPS?
2022-10-10GPS knowledge base: what is RTK technology
2022-12-02How to apply GPS positioner to view the location of the electric vehicle
2023-03-06How to purchase GPS locators?
2023-02-21About GPS Drift
2022-08-19Are the mortgage loan cars installed in the car GPS terminal?mileage tracking webfleet solutions
2023-03-14How to start GPS
2022-08-19GPS positioning principle
2022-11-26