source:Industry News release time:2022-08-20 Hits: Popular:realtime gps tracker online
When it comes to positioning accuracy, we have to talk about SA and AS.
What is SA, AS?
GPS signals have two types of C/A codes and P codes.
The error of C/A code is 29.3m to 2.93m. Common receivers use C/A codes to calculate positioning. In the mid-1990s, the United States added SA (Selective Availability) to the signal for its own safety considerations, which increased the error of the receiver to about 100 meters. On May 2, 2000, SA was cancelled, so our current GPS accuracy should be within 20 meters.
The error of the P code is 2.93 meters to 0.293 meters, which is one tenth of the C/A code. But the P code can only be used by the US military. AS (Anti-Spoofing) is an interference signal added to the P code.
In short, the old beauty is also quite tired. A whole bunch of satellites were sent for military positioning. Then I felt it was not worth it and wanted to make some money, so I developed a signal for civilian use. Because GPS is in the hands of the old and the United States, although it is free to use, it is not practical for other countries to use it. The United States processed the GPS signals in the area two days ago, and the positioning accuracy became lower.
Russia has its own satellite positioning system, the Global Navigation Satellite System (GLObal NAvigation Satellite System). Europe will also develop its own positioning system NAVSAT. China also has its own satellite positioning, called Beidou, which is a dual-star system that can only locate its own country and nearby areas, and is currently only used by the military.
Read recommendations:
Factors affecting GPS positioning accuracy.gps tracker for trailer Production
The manufacturer believes how to effectively prevent the vehicle positioning system from being destr
Last article:GPS application knowledge
Next article:Basic knowledge of GPS satellite positioning system
Related Information
gps vehicle tracker wholesaler
2023-04-23Car gps tracking manufacturer
2023-04-234G GPS Tracker for vehicles maker
2023-04-23Fleet management expert
2023-03-164G GPS Tracker for vehicles
2023-03-16gps tracker for bike
2023-03-16gps tracker for trailer
2023-04-234G GPS Tracker supplier
2023-04-23Car gps tracking price
2023-04-11OBD GPS Tracker distributors
2023-04-233 Years Disposable Asset GPS Tracker
2025-03-31G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-193000mAh Magnet Asset GPS Tracker
2025-03-31G900LS 8 Lines-4G Car GPS Tracker
2025-03-31TK100B- Accurate Pro version GT06/TK100
2023-10-06DGPS Principle
2022-11-19How to buy GPS.Magnetic gps tracker manufacturer
2023-05-24What can GPS do besides navigation?
2022-08-25Brief analysis of the benefits of installing vehicle positioning system.van tracker webfleet solutio
2023-03-13Why do you still use the GPS of the United States?
2022-11-17GPS Tracking Monitoring Promotes Mobile Logistics Management
2022-12-30GPS indoor positioning technology
2022-08-1210 problems with common car GPS positioner.plug & play Obd gps tracker manufacture
2023-03-28Gps speed limiter.What are the functions implemented after the installation of the car GPS on-board
2023-10-13Is the gps tracker easy to use after removing the traffic card?
2022-09-09GPS flat antenna
2022-11-23Global Positioning System
2022-10-12GPS setting RF front end
2022-11-08GPS positioning function
2022-12-10What are the differences between car GPS positioning and mobile phone GPS positioning?plug & pla
2023-03-17