GBAS
The Ground Based Augmentation System (GBAS) is an augmentation to GNSS that focuses its service on the airport area (approximately a 30 km radius). It broadcasts its correction message via a very high frequency
(VHF) radio data link from a ground-based transmitter. GBAS will initially provide support for CAT I Precision Approach operation and ultimately fulfill the extremely high requirements for accuracy, availability, and integrity necessary for Category I, II, and III precision approaches. In addition it will provide the ability for more flexible, curved approach paths, terminal area and regional augmentation in regions which desire such implementation. Current GBAS demonstrated accuracy is less than 1 meter in both the horizontal and vertical axis.
A step-by-step explanation of the GBAS system can be found here:
FAA LAAS - How it Works
Further information on EUROCONTROL's GBAS activities is contained in:
ANT Outline
The LATO focus group (go to LATO page) oversees the GBAS activities and provides a forum to discuss Precision Approach related issues.
Jointly chaired by the FAA and EUROCONTROL, the International GBAS Working Group (I-GWG) provides a biannual working forum on GBAS.
Presentations and papers from its meetings are available through the GBAS Issues and LATO Focus group (Link) OneSky team.
The PEGASUS tool provides a validation environment fro GBAS systems and is available to interested stakeholders.
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