B-value Research for FAA LAAS Station Integrity and Fault Detection

Hengqing Wen, Joseph Havlicek, and John Fagan

Abstract:	The University of Oklahoma (OU) successfully developed a Local Area Augmentation System (LAAS) based on FAA prototype in 2001. Our LAAS is the first running LAAS system after FAA. With three reference stations, OU LAAS has been used for field tests on Category I and Category II precision approaches. We have used it for the tests of LAAS performance and missed approach. It is now used for testing the curved-path approach. We have seen a promising success for LAAS applications and we are working on pushing LAAS into commercial practice. The B-values are measures to detect the reference fault and protect system integrity. However, there’s still no systematic way to determine the fault detection threshold. This paper is to present some research results at OU and show that three-reference configuration has a different performance than four-reference system and thus the detection threshold and the protection levels (PL) should be dealt with discretions. This paper proposed a way to determine the fault detection thresholds for both configurations. Comparison is made to give the difference between the three and four reference systems. The overall system integrity test result is also provided.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	817 - 822
Cite this article:	Wen, Hengqing, Havlicek, Joseph, Fagan, John, "B-value Research for FAA LAAS Station Integrity and Fault Detection," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 817-822.
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