The Aircraft based augmentation was introduced to augment the received GNSS information based on the information available on board to enhance the performance of the core-satellite constellations.


ABAS Avionics equipped in aircraft use one of the following techniques to enhance the performance (accuracy, integrity, continuity, and/or availability) of unaugmented GNSS and/or of the aircraft navigation system:

RAIM, is a technique which uses redundant GNSS information from multiple satellites to asses data integrity using an onboard GNSS receiver with RAIM capability.

Aircraft autonomous integrity monitoring (AAIM), uses information from additional onboard sensors such as the Inertial Navigation System (INS) to calculate the GNSS data integrity.

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