EFFECT OF WET SNOW ON THE NULL-REFERENCE ILS SYSTEM

Authors
WALTON EK
Citation
Ek. Walton, EFFECT OF WET SNOW ON THE NULL-REFERENCE ILS SYSTEM, IEEE transactions on aerospace and electronic systems, 29(3), 1993, pp. 1030-1035
Citations number
12
Categorie Soggetti
Telecommunications,"Engineering, Eletrical & Electronic","Aerospace Engineering & Tecnology
Journal title
IEEE transactions on aerospace and electronic systems → ACNP
ISSN journal
00189251
Volume
29
Issue
3
Year of publication
1993
Pages
1030 - 1035
Database
ISI
SICI code
0018-9251(1993)29:3<1030:EOWSOT>2.0.ZU;2-V
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 r unway. Under certain combinations of snow and earth wetness, there is a severe reduction in the amplitude of the ground reflected signal com ponent. This can severely degrade the glide slope null and thus the IL S system.