Augmentation

Any technique of providing enhancement to GNSS in order to provide improved navigation performance to the user.

– Satellite-based augmentation system (SBAS). A system providing additional satellite signals in order to enhance the performance of the GNSS service. (e.g. Wide Area Augmentation System (WAAS, US); European Geostationary Navigation Overlay Service (EGNOS); Multi-transport Satellite Augmentation System (Japan); GPS Aided Geo Augmented Navigation system (GAGAN, India)

– Ground-based augmentation system (GBAS). A system providing additional signals from a ground-based station in order to enhance the performance of the GNSS service. (e.g. IALA DGNSS beacon system)

Source: Nick Ward, IALA e-Nav committee vicechair, March 2009

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