The MLS Integrated Approach System: Hybrid Position Calculation and Initial Flight Test Results

Edward J. Breeuwer, Dignus-Jan Moelker and Durk van Willigen

Abstract:	MIAS, an acronym for the MLS Integrated Approach System, is a navigation system based on MLS and differential GPS, meant for the precision approach phase of flight. The differential GPS data are transmitted through the Auxiliary Data Word channel of MLS. To put a minimum load on this channel, the differential corrections need to be transmitted with a minimum update rate to leave adequate room for other potential data channel users, while at the same time preserving the accuracy and integrity specifications. MIAS offers an increased level of integrity with respect to the autonomous systems and the redundant set of measurement sources gives a higher continuity- of-service. MIAS is a system composed of an angle- based system and a range-based system, hence it is more complex to set up the hybrid position calculation. This paper presents a comprehensive treatment of the hybrid position calculations needed for MIAS and gives a qualitative assessment of the achievable level of integrity and Continuity-of-Service. Delft University has performed flight tests at Amsterdam’s Schiphol Airport in order to collect MLS and GPS data. Initial results of the hybrid system are described.
Published in:	Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993) June 21 - 23, 1993 Royal Sonesta Hotel Cambridge, MA
Pages:	101 - 110
Cite this article:	Breeuwer, Edward J., Moelker, Dignus-Jan, van Willigen, Durk, "The MLS Integrated Approach System: Hybrid Position Calculation and Initial Flight Test Results," Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993), Cambridge, MA, June 1993, pp. 101-110.
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