Vertically-guided Instrument
Approaches Using the Wide Area Augmentation System (WAAS)
May 2003
Emily Q. Calle, The MITRE Corporation
H. Leslie Crane, The MITRE Corporation
S.V. Massimini, DSc, The MITRE Corporation
Frederick A. Niles, The MITRE Corporation
ABSTRACT
The WAAS system, which will be commissioned in 2003, will provide
the capability for vertically-guided instrument approaches at most runway
ends in the continental United States. Different criteria have been
developed for designing these instrument approaches. This presentation
will provide background on the development of vertically-guided instrument
approaches and estimates of the relative benefits provided by several
different approach criteria, including the approaches governed by the
new Required Navigation Performance (RNP) criteria.

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