The Navigation Performance of the Multi-Mode Integrated Approach System

Edward J. Breeuwer, Robert B. Engels, Harry C.F. Benckhuijsen, Maarten Vijt de Hoag, and Durk van Willigen

Abstract:	MIAS, an acronym for the Multi-mode Integrated Approach System, is a navigation system based on the Microwave Landing System and differential GPS, intended for the precision approach phase of flight. The data link required for the differential messages is provided by the Auxiliary Data Word Channel of MLS. Initial flight test results have shown that MIAS is able to tkltil the accuracy demands made by ICAO for Category I, II and III approaches [2]. The main strength of MIAS is its dissimilar redundancy which offers a higher Continuity+f- Service and an increased level of integrity with respect to the autonomous systems. MIAS offers the unique combination of external integrity monitoring of the MLS signals on the ground and Receiver Autonomous Integrity Monitoring of both the MLS and GPS signals in the air. Due to its dissimilar redundancy a single system component failure of MIAS will not affect the availability of the approach system. This paper presents the Integrity and Continuity-of-Service figures of the Multi-Mode Integrated Approach System. Shown is that a Cat II MLS ground installation together with GPS is capable of fultilling the RNP Continuity of Service Requirements for Cat III, which could provide a substantial cost reduction factor for the implementation of MLS. In addition an enhanced technique for RAIM called RASIM is presented, which makes optimal use of the hybrid form of MLS and GPS. The second part of the paper assesses MIAS as the positioning component in the concept of the Required Navigation Performance and shows that the hybrid use of a global and a relative positioning system reduces the integrity load on an on-board data base.
Published in:	Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994) June 6 - 8, 1994 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	401 - 410
Cite this article:	Breeuwer, Edward J., Engels, Robert B., Benckhuijsen, Harry C.F., de Hoag, Maarten Vijt, van Willigen, Durk, "The Navigation Performance of the Multi-Mode Integrated Approach System," Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994), Colorado Springs, CO, June 1994, pp. 401-410.
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