Ground-Based Augmentation System (GBAS)

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Ground-Based Augmentation System (GBAS)
YMML GBAS WF.mp3.png
Frequencies 108 MHz,117.975 MHz
Frequency Range 108 MHz - 117.975 MHz
Mode AM
Modulation D8PSK
Emission Designator
Bandwidth 15 kHz
Location Worldwide
Short Description GBAS is an advanced aircraft navigation system that provides GPS corrections to aircraft on approach.
I/Q Raw Recording
Audio Sample

Ground-Based Augmentation Systems (GBAS) forms part of the Global Navigation Satellite System (GNSS), and provides GPS corrections to aircraft on approach, guiding them to land. GBAS will eventually replace conventional Instrument Landing Systems, as it is more precise than ILS and is less expensive to install.


GBAS is used on the VHFVery High Frequency (30-300 MHz) aeronautical radio navigation band between 108-117.975 MHzMegaHertz (MHz) 10^6 Hz, with a 25 kHzKiloHertz (kHz) 10^3 Hz channel spacing.

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