ILS glideslope evaluation for imperfect terrain

Poulose, MM and Mahapatra, PR (1988) ILS glideslope evaluation for imperfect terrain. In: IEEE Aerospace and Electronic Systems Magazine, 24 (2). pp. 186-191.

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Abstract

Instrument landing systems (ILS) are normally designed assuming the site around them to be flat. Uneven terrain results in undulations in the glidescope. In recent years, models have been evolved for predicting such aberrations as a simpler alternative to experimental methods. Such modeling normally assumes the ground to be fully conducting. A method is presented for considering imperfect terrain conductivity within the framework of the uniform theory of diffraction (UTD). A single impedance wedge formulation is developed to a form that resembles the standard form of UTD, with only one extra term in the diffraction coefficient. This extends the applicability of the standard UTD formulation and software packages to the case of the imperfectly conducting terrain. The method has been applied to a real airport site in India and improved agreement with measured glidescope parameters is demonstrated

Item Type:	Journal Article
Publication:	IEEE Aerospace and Electronic Systems Magazine
Publisher:	ieee
Additional Information:	Copyright 1988 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	21 Sep 2010 09:36
Last Modified:	21 Sep 2010 09:36
URI:	http://eprints.iisc.ac.in/id/eprint/32286

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