Title :
Effect of wet snow on the null-reference ILS system
Author_Institution :
ElectroSci. Lab., Ohio State Univ., Columbus, OH
fDate :
7/1/1993 12:00:00 AM
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;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
