GNSS: Global Navigation Satellite System
Generic term for satellite navigation systems like GPS, GLONASS, GALILEO
for detailed information visit wikipedia.org
GALILEO:
Civil, European satellite navigation system
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GLONASS: Globalnaja Nawigazionnaja Sputnikowaja Sistema
Satellite navigation system developed for military purposes by Russia, also used for civil purposes
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GPS: Global Positioning System
Developed for military purposes by the USA, also used for civil purposes
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EGNOS: European Geostationary Navigation Overlay Service
European system for existing GPS signals providing higher accuracy and information about reliability of the signal
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GATE:
Galileo test and development environment
