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What are SBAS, WAAS and EGNOS and what are they used for?

April 26, 2017egnos SBAs Used WAAS

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What are SBAS, WAAS and EGNOS and what are they used for?

1 Answer

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10 Posted

These systems provide correction data to enhance the accuracy of the GPS position. The correction data covers variables such as: • Long term errors of the satellite orbits • Short term and Long term errors of the satellite clocks • IONO correction grids (Ionospheric corrections) • Integrity information Wide Area Augmentation System (WAAS), Multi-Functional Satellite Augmentation System (MSAS) and European Geostationary Navigation Overlay Service (EGNOS) all provide similar correction data that is transmitted over two of the 20 channels of the GPS receiver. The data is then used by the GPS engine to improve the accuracy of the fix.