Integrating WAAS into LAAS to Improve the Integrity of LAAS

Hengqing Wen, Peter Yih-ru Huang, John Dyer, Andy Archinal and John Fagan

Abstract:	The University of Oklahoma has developed a fully functional Local Area Augmentation System (LAAS) based on FAA prototype. The system has been used to conduct tests on LAAS validation, guided approach, guided missed approach, guided departure and curved path approach. According to the LAAS MOPS (RTCA DO-253A), three or four local reference stations are needed to guarantee the integrity of the LAAS signal in space. Since WAAS is providing the signal with the integrity risk in the degree of ten to the minus seven, LAAS can take advantage of the ready-to-use WAAS signal to increase FAA LAAS integrity. This paper studies the impact of losing one or more references on LAAS integrity, proposes the algorithms to integrate WAAS into LAAS integrity check, presents the extent of the LAAS integrity that can be improved by WAAS and illustrates the theoretical and simulation results. Our research shows the integration will improve the LAAS integrity especially when LAAS is losing its reference(s). This paper will also study the LAAS accuracy and continuity effects after the integration.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	2855 - 2860
Cite this article:	Wen, Hengqing, Huang, Peter Yih-ru, Dyer, John, Archinal, Andy, Fagan, John, "Integrating WAAS into LAAS to Improve the Integrity of LAAS," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 2855-2860.
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