Enhancing GAST D Availability by Using an Ionospheric Field Monitor

Susumu Saito and Takayuki Yoshihara

Peer Reviewed

Abstract:	The global navigation satellite system (GNSS) ground-based augmentation system (GBAS) approach service type (GAST) D is one of the GBAS approach service types that can support Category II/III approach and landing based on single-frequency Global Positioning System (GPS) and/or Russian Global Navigation Satellite System (GLONASS) signals. It has been shown that the availability of GAST D service may not be sufficient in ionospherically active regions such as low magnetic latitude regions. Here, we propose to improve the availability of GAST D service by using the ionospheric field monitor (IFM) that has previously been proposed for use with GAST C. The residual differential error and missed-detection probability in GAST D with the IFM are evaluated by simulation. The results show that the IFM provides a simple and effective means for reducing the residual differential error associated with ionospheric anomalies and for improving the availability of GAST D service in ionospherically active regions.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 73, Number
Cite this article:	Citation Tools are available on the NAVIGATION open access site https://doi.org/10.33012/navi.731
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