Introduction to GNSS

Global Navigation Satellite System (GNSS) is the generic term for all of the Satellite Systems in use, or under construction.

Global Positioning System (GPS) is a space-based global navigation satellite system developed by the United States Department of Defense. It is widely used for civilian navigation and positioning, surveying and scientific applications and is the only fully functional satellite system.

The Russian GLObal NAvigation Satellite System (GLONASS) is operated by the Russian Ministry of Defense. There are also the planned Chinese Compass navigation system and Galileo positioning system of the European Union (EU).

GPS uses a constellation of between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave signals, which enable GPS receivers to determine their location, speed, direction, and time. GPS was. Its official name is NAVSTAR-GPS.

It is maintained by the United States government and is freely accessible by anyone with a GPS receiver.

For more information please visit these external links:

http://tycho.usno.navy.mil/gpsinfo.html

http://www.glonass-ianc.rsa.ru

http://www.ngs.noaa.gov/orbits/