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Harmonisation of Category-III Precision Approach Navigation System Performance Requirements

Published online by Cambridge University Press:  13 September 2010

Wolfgang Schuster  and
Washington Ochieng
Wolfgang Schuster*
Affiliation:
(Centre for Transport Studies, Imperial CollegeLondon)
Washington Ochieng
Affiliation:
(Centre for Transport Studies, Imperial CollegeLondon)
*
(Email: w.schuster@imperial.ac.uk)
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Abstract

Two distinct methods have been proposed and used to derive the required performance for CAT-II and III precision approaches: the “ILS (Instrument Landing System) Look-Alike Method” and the “Autoland Method”. The former is based on the concept of matching the performance of the ILS at the Navigation System Error (NSE) level through linearization of current specifications at a given height. The latter is based on the need to protect the safety of a landing operation using the current specification for the probability to land in a given landing box. Fundamentally, both methods assume the same safety targets and type of distribution, and are independent of specific navigation architectures. Therefore, they should deliver the same performance requirements. However, the requirements from the two methods for CAT-III approach are different. This paper reviews the two methods in detail, highlighting the key differences, and proposes ways to reconcile the methods and the requirements.

Keywords

CAT IIIILS Look-alikeAutoland
Type
Research Article
Information
The Journal of Navigation , Volume 63 , Issue 4 , October 2010 , pp. 569 - 589
Copyright
Copyright © The Royal Institute of Navigation 2010

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