Global Positioning System (GPS)
The Global Positioning System (GPS) is a satellite based global navigation system which provides time and location services to users across the globe. The constellation is formed of 31 active satellites that broadcast a precision code and navigation message down to Earth. In order to obtain the most accurate time and location data, a receiver must be within line of sight to at least four satellites.
Bands L1 and L2 are available for civilian use, while band L5 is designated for aeronautical services.
|Band||Freq. (MHzMegaHertz (MHz) 10^6 Hz)||Bandwidth||Usage|
|L1||1575.42||15.345 MHzMegaHertz (MHz) 10^6 Hz||Precision Code Broadcasts|
|L2||1227.60||11 MHzMegaHertz (MHz) 10^6 Hz||Precision Code Broadcasts|
|L3||1381.05||Nuclear Detonation Detection|
|L4||1379.913||Ionospheric Correction Studies|
|L5||1176.45||12.5 MHzMegaHertz (MHz) 10^6 Hz||Safety of Life (SoL) Signal|