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:
Portable car gps systems Manufacturing
The principle of GPS indoor positioning technology
What is the difference between a car GPS locator and GPS navigation?
Last article:The obvious advantages and characteristics of GPS products
Next article:GPS helps you avoid the electronic eye
Related Information
4G GPS Tracker for vehicles Production
2023-04-23fleet gps tracking Vendor
2023-04-23real-time gps tracking wholesale
2023-04-23car gps tracker maker
2023-04-23Gps speed limiter Processing
2023-04-23gps vehicle tracker price
2023-04-23real-time gps tracking company
2023-04-23simple gps tracking Manufacturing
2023-04-23fleet gps tracking supplier
2023-04-23GPS Tracking price
2023-04-11G05N Vehicle Tracker
2022-06-21TK08A Motorcycle GPS Tracker
2022-06-20G02M Pet Tracker
2022-06-19TK100N- Multi functional GPS Tracker
2023-10-06G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19The development history of GPS
2022-08-12GPS is mainly composed of.obd-II port gps tracker Manufacturing
2023-05-20Why is it recommended to install the GPS vehicle positioning system?Portable car gps systems
2023-03-24Two major trends of GPS navigators
2022-08-10GPS network time server.Gps speed limiter manufacture
2023-05-27What are the types of driving recorders?GPS Tracker for vehicles Manufacturing
2023-04-14How should a car loan company choose a reasonable car GPS locator?obd2 gps tracker verizon
2023-03-24gps vehicle tracker.Wireless GPS locator
2023-10-20Introduction and Comparison of GPS PPS Technology and Other Clock Synchronization Technologies
2022-11-11Mobile GPS positioning
2023-07-13Disadvantages of GPS cameras.realtime gps tracker online distributors
2023-08-16Frequently problem solving of GPS positioner.realtime gps tracker online distributors
2023-03-09Polarization Design of GPS.fleet gps tracking
2022-11-16Simulator test GPS
2022-10-10GPS, crawling in chaos
2022-12-20