DocumentCode
916236
Title
Effect of wet snow on the null-reference ILS system
Author
Walton, E.K.
Author_Institution
ElectroSci. Lab., Ohio State Univ., Columbus, OH
Volume
29
Issue
3
fYear
1993
fDate
7/1/1993 12:00:00 AM
Firstpage
1030
Lastpage
1035
Abstract
The null-reference instrument landing system (ILS) uses a horizontally polarized antenna on a tower to produce an elevation angle null which forms the VHF glide slope signal used in instrument approaches to a runway. Under certain combinations of snow and Earth wetness, there is a severe reduction in the amplitude of the ground reflected signal component. This can severely degrade the glide-slope null and thus the ILS system
Keywords
antennas; electromagnetic wave polarisation; electromagnetic wave reflection; instrument landing systems; radiowave propagation; snow; Earth wetness; VHF glide slope signal; elevation angle null; glide-slope null; ground reflected signal; horizontally polarized antenna; instrument landing system; null-reference ILS system; wet snow; Degradation; Dielectric constant; Dielectric losses; FAA; Instruments; Polarization; Poles and towers; Reflection; Reflectivity; Snow; Soil;
fLanguage
English
Journal_Title
Aerospace and Electronic Systems, IEEE Transactions on
Publisher
ieee
ISSN
0018-9251
Type
jour
DOI
10.1109/7.220950
Filename
220950
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