Integrated GNSS/Altimeter Landing System

Ronald Braff

Abstract:	The purpose of the study reported in this paper is to describe and analyze the performance of a future integrated GNSS/altimeter system that would have capability to support approaches to 200 ft decision height without SBAS or GBAS. If such a system could provide comparable vertical guidance capability as the LAASGBAS Service Level C, precision approach to lowest Category I minima, it could provide full Category I service that includes the integrity performance to support visually monitored autoland. The time frame of the study is when both GPS III and Galileo will be fully implemented. The vertical guidance component includes the roles of barometric altimeter and radar (or laser) altimeter (RA) with terrain elevation database, minimization of the needed database coverage area, and a sensor integration method and algorithm that adjusts vertical solution weights to achieve required vertical integrity risk regardless of the magnitude of a fault error due to either a GNSS or RA fault. The robustness of the system when there are simultaneous GNSS and RA faults is also analyzed. For the less demanding horizontal component, the guidance is based on un-augmented GNSS and integrity is provided by RAIM. The performance analysis is based on availability achieved over the 48 states when an assumed GPS III alone or combined GPS III/Galileo are the GNSS component of the system. Included in the analysis are assumed sensor errors, vertical integrity risk analysis to quantify high-level system integrity requirements, and continuity risk and accuracy requirement considerations.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	2934 - 2949
Cite this article:	Braff, Ronald, "Integrated GNSS/Altimeter Landing System," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 2934-2949.
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