NDLI: Integrity monitoring requirements for FAA's GPS Wide-Area Augmentation System (WAAS)

Content Provider	IEEE Xplore Digital Library
Author	Loh, R. Fernow, J.P.
Copyright Year	1994
Description	Author affiliation: Center for Adv. Aviation Syst. Dev., MITRE Corp. (Loh, R.; Fernow, J.P.)
Abstract	Three years ago, FAA started on an ambitious program to perform research, development and implementation of satellite navigation based on the approval and use of the DoD's Global Positioning System (GPS). One of the research and development (R&D) projects was to determine the capabilities and requirements for a GPS Wide-Area Augmentation System (WAAS), a ground-based GPS augmentation. The FAA's WAAS will consist of up to about 30 ground reference stations that will combine data to estimate separate corrections for clock and ephemeris for each monitored satellite, and also generate a correction term for ionospheric delays at lattice points on a grid formed by the intersection of lines of constant latitude and longitude. The corrections are relayed through geostationary satellites in order to reach all users in a wide geographic area. Since WAAS is expected to support Category I (CAT I) precision approaches, stringent integrity monitoring requirements will have to be satisfied. Existing single location navigation sources, such as ILSs, are monitored at a single location, whereas WAAS must be monitored at many locations and the information combined to produce a single integrity broadcast message suitable for a wide geographic area. In addition, the WAAS message includes separate differential correction components that can be individually monitored, but the integrity information must be correlated with an aircraft position error. The authors develop integrity monitoring requirements, starting with the instrument landing system (ILS), and extrapolating them for WAAS.
Starting Page	629
Ending Page	636
File Size	785872
Page Count	8
File Format	PDF
ISBN	0780314352
DOI	10.1109/PLANS.1994.303369
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-04-11
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monitoring FAA Global Positioning System Satellite broadcasting Satellite navigation systems Delay estimation Research and development Clocks Mesh generation Lattices
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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