Ground-Based Augmentation System (Gbas)

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Submitted By pankrissy
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Ground-Based Augmentation System (GBAS) is a satellite navigation technology added to the Global Navigation Satellite System (GNSS) to augment the entire performance. GNSS basically consists of the Global Positioning System (GPS) and the Global’naya Navigatsionnaya Sputnikovaya Sistema (GLONASS). However, due to the ionospheric gradient, the performance of GNSS with GPS and GLONASS only is limited. Four Augmentation Systems are thus added to GNSS, including the Space-Based Augmentation System, Ground-Based Augmentation Systems, Airplane-Based Augmentation Systems, and Ground-Based Regional Augmentation Systems, in order to improve accuracy, integrity, continuity of service, and availability of navigation. Among the four augmentation systems, GBAS is the only one capable of meeting the most stringent operational needs of aviation, e.g. takeoff and landing in low-visibility conditions. Therefore, it has been effectively applied to the support of takeoff and landing operations.

GBAS consists of a ground segment, airborne segment, and space segment. To facilitate the navigational performance augmentation, GABS is used to develop differential corrections for each satellite, and broadcast these corrections to the airborne receiver over a very high frequency (VHF) data broadcast (VDB) signal transmitted in the 108.0-117.975 MHz band. The ground segment consists of three or four reference receivers located on or near an airport property. These receivers track the signals from navigation satellites. By measuring the time of transmission between the GPS satellite and the reference receivers, the distance the signal traveled is determined, correcting the errors of the GPS or GLONASS. The GBAS Ground Facility then provide aircraft with the updated corrections, integrity, and approach path information through the VHF data link.

With the improved accuracy, integrity,…...

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