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The European Geostationary Navigation Overlay Service (EGNOS) is a satellite-based augmentation system (SBAS) developed by the European Space Agency and EUROCONTROL on behalf of the European Commission. Currently, it supplements GPS by reporting on the reliability and accuracy of their positioning data and sending out corrections.
GNSS augmentation is a method of improving a navigation system's attributes, such as accuracy, reliability, and availability, through the integration of external information into the calculation process, for example, the Wide Area Augmentation System, the European Geostationary Navigation Overlay Service, the Multi-functional Satellite ...
The geostationary satellite (green) always remains above the same marked spot on the equator (brown). A geostationary equatorial orbit (GEO) is a circular geosynchronous orbit in the plane of the Earth's equator with a radius of approximately 42,164 km (26,199 mi) (measured from the center of the Earth).
Satellites in the first generation Meteosat series [1] Satellite Launch date Mission end Meteosat-1: 23 November 1977 Imager failed in November 1979; data collection ended in 1984 Meteosat-2: 10 June 1981 Moved to graveyard orbit in December 1991 [2] Meteosat-3 (Meteosat-P2) 15 June 1988 Retired in 1995 Meteosat-4 (MOP-1) 19 April 1989
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Geostationary satellites are launched to the east into a prograde orbit that matches the rotation rate of the equator. The smallest inclination that a satellite can be launched into is that of the launch site's latitude, so launching the satellite from close to the equator limits the amount of inclination change needed later. [48]
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The actual measured accuracy of the system (excluding receiver errors), with SA turned off, based on the findings of the FAA's National Satellite Test Bed, or NSTB. WAAS Measured 0.9 m / 1.3 m The actual measured accuracy of the system (excluding receiver errors), based on the NSTB's findings. Local Area Augmentation System (LAAS) Specification