Global Navigation Satellite System (EGONS)
Introduction Global Navigation Satellite System (GNSS) is an umbrella term that include vase range of satellite navigations system that provide geospatial and positioning data in a global range covering, systems such as: GPS (USA) , GLONASS (Russia), QZSS (Japan) ...etc. Here well define the European Geostationary Navigation Overlay Service (EGONS) as an example of GNSS,its history, system segments, explore satellites names and their signals, navigation, Reference from and time and accuracy. Definition The European Geostationary Navigation Overlay Service (EGNOS) is a satellite based augmentation system (SBAS) developed by the European Space Agency and EUROCONTROL . It was intended for general Purpose application and freely accessible. also supply GPS, GLONASS and Galileo by sending report about their reliability and accuracy of their positioning data and provide corrections History The system started in 2009 after the European Commission signed a contract with the European Sate