Integrated GPS LAAS/Inertial Guidance System Using Multiple Kalman Filters

Mats Brenner

Abstract:	In current air transport aircraft the integration of inertial signals with (ILS or LAAS) guidance signals and radar altitude is performed in complementary filters. This paper investigates an alternative integration technique, where the LAAS broadcast differential information is tightly integrated with inertial signals by means of multiple Kalman filters. In this mechanization the main filter provides the guidance signal and the sub–filters are used to propagate integrity information with regard to the LAAS signal in space. The paper discusses the benefits and performance improvements of this type of integration. It is specifically shown that the continuity risk associated with a satellite failure or a temporary drop of a satellite can be reduced. The paper also quantifies the capability to complete a precision approach or a CAT III B roll out within required bounds in a situation where the LAAS broadcast or GPS signals are suddenly lost.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	681 - 690
Cite this article:	Brenner, Mats, "Integrated GPS LAAS/Inertial Guidance System Using Multiple Kalman Filters," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 681-690.
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