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:
4G GPS Tracker for vehicles Processing
What are the fixed installation locations for GPS locators.gps tracker for trailer maker
Last article:The obvious advantages and characteristics of GPS products
Next article:GPS helps you avoid the electronic eye
Related Information
fleet gps trackers company
2023-04-23pet gps tracker cat supplier
2023-03-16Dog gps tracker
2023-04-23Dog gps tracker Manufacturing
2023-04-23gps tracker for kids Vendor
2023-04-23gps tracker device
2023-04-11Cantrack TK100
2023-04-23GPS Tracker Solution
2023-04-11Gps speed limiter supplier
2023-04-23Dog gps tracker sales
2023-04-23TK100 (GT06) Vehicle Tracker
2022-06-20TK08A Motorcycle GPS Tracker
2022-06-20G03
2022-06-21G500L -4G OBD GPS Tracker
2022-09-06P60L Personal gps tracker
2022-06-21GPS function and use
2022-10-10Can a gps tracker be made smaller?
2022-07-16The role of UAV GPS module
2022-10-13Introduction to the principle of Beidou positioning by positioning manufacturers.gps tracker for tra
2023-06-20WIFI GPS
2022-10-25What are the functions of the driving recorder?obd-II port gps tracker Manufacturing
2023-04-14GPS receiver work principle.gps tracker no monthly fee Manufacturing
2023-04-23GPS tracking purchase method.4G GPS Tracker for vehicles Manufacturing
2023-08-17GPS classification and usage.gps vehicle tracker company
2023-07-14How to choose the installation location of the wireless GPS positioner?4G GPS Tracker for vehicles
2023-03-22Overview of the car navigation system.Magnetic gps tracker Manufacturing
2023-05-18What are GPS satellite tracks?
2022-10-26Do you know the working principle of the pet GPS positioner?realtime gps tracker online wholesaler
2023-03-10What does the gps fee for buying a car mean?
2022-08-12How to use gps tracker?
2022-09-19