Improvements on the Instrument Landing System

The present paper deals primarily with CAA contribution to the art of instrument landing systems and is confined to the localizer and glide-path portions of the system. It describes briefly the present standard 8-loop localizer used at most sites as well as some modifications made in the basic localizer concept in order to adapt it to locations where siting problems exist. It also describes the standard glide slope as well as a new type of glide slope for use at extremely poor locations.