Flight Evaluation of GPS Aided Inertial Navigation Avionics with MSAS Augmentation (MSAS-GAIA)

H. Tomita, M. Harigae, K. Hoshinoo

Abstract:	MSAS-GAIA is a next-generation aircraft on-board navigation system that integrates GPS with INS (Inertial Navigation System) and can utilize both wide- and local-area augmentation systems for GPS, in particular the MSAS augmentation system that will broadcast correction signals from the MTSAT satellite. A flight experiment was carried out to evaluate the performance of the MSAS-GAIA system. Because MTSAT is not yet on orbit, MSAS messages were transmitted to the experiment aircraft via a landline and local radio link. The system demonstrated good accuracy, with a 95% navigation error of 1.8m horizontal and 2.2m vertical during flights totaling eight hours. Error due to ionospheric delay and range error due to clock and satellite position errors were properly corrected using the MSAS messages. Integration with INS gave stable protection levels even during temporary loss of GPS signals, and 100% availability meeting APV-I required navigation performance was achieved. The smooth switching from satellite- to ground-based augmentation (MSAS to CDGPS/INS) was also successfully demonstrated.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	2819 - 2827
Cite this article:	Tomita, H., Harigae, M., Hoshinoo, K., "Flight Evaluation of GPS Aided Inertial Navigation Avionics with MSAS Augmentation (MSAS-GAIA)," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 2819-2827.
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