Aircraft Based Augmentation Systems (ABAS)
The performance improvement resulting from Aircraft Based Augmentation Systems (ABAS) is based on the use of redundant elements in the GNSS constellation or the combination of GNSS information with other navigation aids for integrity monitoring.Systems that analyse data gained from other aircraft systems beside GNSS signals are called Aircraft Autonomous Integrity Monitoring. (AAIM)
Additional information typically used comprises the barometric altitude from the altimeter or the position indication of an inertial system (INS/IRD).
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