source:truck tracking webfleet solutions release time:2023-02-01 Hits: Popular:realtime gps tracker online
When it comes to positioning accuracy, we should talk about SA and AS
What is SA, AS?
There are two kinds of GPS signals: C/A code and P code.
The error of C/A code is 29.3m to 2.93m. The general receiver uses C/A code to calculate the location. For its own safety, the United States added SA (Selective Availability) to the signal in the middle of the 1990s, which increased the error of the receiver to about 100 meters. SA was cancelled on May 2, 2000, so our current GPS accuracy should be within 20 meters.
The error of P code is 2.93m to 0.293m, which is one tenth of that of C/A. But P code can only be used by the US military. AS (Anti Spoofing) is a jamming signal added to P code.
In a word, Lao Mei is also very tired. A lot of satellites were sent for military positioning. Then I thought it was not worth it and wanted to make some money, so I developed signals for civilian use. The accuracy could not be too high, but people cursed me when the accuracy was low. Because GPS is in the hands of the United States. Although it is free to use, it is not practical for other countries to use it. The United States has processed the GPS signals in this area two days ago when it hit Afghanistan, and the positioning accuracy has become lower.
Russia has its own satellite positioning system, Global Navigation Satellite System. Europe should also develop its own positioning system, NAVSAT. China also has its own satellite positioning system, called Beidou, which is a dual satellite system. It can only locate its own country and nearby areas, and is currently only used for the military.
Read recommendations:
The editor of Beidou Tong introduced how to use the driving recorder.realtime gps tracker online who
Last article:The obvious advantages and characteristics of GPS products
Next article:GPS helps you avoid the electronic eye
Related Information
car gps tracker manufacturer
2023-04-23car gps tracker
2023-04-11Pet GPS Tracker supplier
2023-03-16Gps speed limiter
2023-04-11Dog gps tracker
2023-04-11gps vehicle tracker manufacturer
2023-04-23Cantrack G05
2023-04-11real-time gps tracking Manufacturing
2023-04-23car gps tracker custom
2023-04-11Car gps tracking price
2023-04-114G Wired GPS Tracker PCBA
2022-06-17G03
2022-06-21G500M-Mini GPS Tracker
2022-06-2010000mAh Magnetic Asset GPS Tracker
2025-04-08GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07Application in GPS Meteorology.plug & play Obd gps tracker manufacturer
2023-04-2410 problems with common car GPS positioner.plug & play Obd gps tracker manufacture
2023-03-28GPS network security ideas
2022-08-12Introduction to GPS system functions
2022-11-11GPS receiver introduction.gps tracker no monthly fee Solution
2023-05-11The correct method of using the car GPS positioning system shallow analysis.realtime gps tracker onl
2023-03-28How to use the car GPS positioner after installation?plug & play Obd gps tracker Processing
2023-03-28What factors can interfere with the signal of a car GPS locator.simple gps tracking
2023-09-18Fleet management.Analysis of users' demand for monitoring services of car GPS positioning systems
2023-11-03Advantages of GPS technology
2022-10-22What are the precautions for using the Beidou car GPS?plug & play Obd gps tracker Production
2023-04-14What are the precautions for installing the car GPS positioner
2023-02-25GPS positioning manufacturers introduce the composition of satellite positioning systems.Dog gps tra
2023-06-14GPS, crawling in chaos
2022-12-20GPS system composition.mini gps tracker manufacture
2023-07-13