Satellite-Based Augmentation Systems (SBAS) are civil aviation safety-critical systems that augment Global Navigation Satellite Systems (GNSS), such as GPS, by providing integrity information, differential corrections, and improved accuracy. They are typically used to enhance the reliability and accuracy of positioning data for aviation, maritime, and land-based applications. Common SBAS systems include WAAS (Wide Area Augmentation System) in the United States, EGNOS (European Geostationary Navigation Overlay Service) in Europe, and MSAS (MTSAT Satellite Augmentation System) in Japan.
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