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:
Last article:The obvious advantages and characteristics of GPS products
Next article:GPS helps you avoid the electronic eye
Related Information
gps tracker app price
2023-04-11car gps tracker price
2023-04-11gps tracker auto
2023-04-11mini gps tracker Processing
2023-04-234G obd gps trackewr
2023-03-16Pet GPS Tracker wholesale
2023-03-16van tracker webfleet solutions
2023-03-16GPS Tracker for vehicles Vendor
2023-03-16gps vehicle tracker Vendor
2023-04-11fleet gps tracking Factory
2023-04-23G500M-Mini GPS Tracker
2022-06-20TK08A Motorcycle GPS Tracker
2022-06-20G09L -6 inch Tail light tracker
2022-06-20P60L Personal gps tracker
2022-06-21personal gps tracker Production
2022-09-06Detailed introduction to GPS satellite constellation.plug & play Obd gps tracker wholesaler
2023-05-06GPS Tracking Monitoring Promotes Mobile Logistics Management
2022-12-01GPS mobile phone positioning characteristics
2022-10-21How to install and place the GPS tracker with more accurate positioning and stronger signal
2022-07-14Six characteristics of GPS
2022-10-12How to judge the quality of a car GPS locator?vehicle gps tracker webfleet solutions
2023-03-21GPS vehicle positioning.simple gps tracking Solution
2023-07-04What are the commonly used car GPS positioner?
2023-02-25gps vehicle tracker.Provide a complete set of solutions for the application field of GPS positioning
2023-11-06GPS navigation all-in-one machine.Pet GPS Tracker distributors
2023-07-18Introduction to GPS application scope
2022-12-13Causes of GPS Positioning Drift
2022-09-20GPS signal in the air
2022-11-08About GPS Drift
2022-08-19Does gps tracker cost traffic?
2022-09-15