A Guide for the Selection of Antenna Characteristics for Single Frequency and Two Frequency Localizers in the Presence of Reflecting Structures.
Final rept. Oct 69-Apr 75,
ALFORD (ANDREW) CONSULTING ENGINEERS WINCHESTER MA
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Four new localizer antenna arrays, utilizing traveling wave elements, have been developed for the FAA. These elements are directional and are free of the mutual coupling problems of former arrays. Additionally the elements in the arrays are fed through couplers which have a 50 ohm input and output impedance. All arrays are broad band and operate without any line cutting. An initial part of this effort was to study a large number of the congested airports and determine the theoretical patterns necessary to provide CAT I or CAT II performance. Additionally the arrays were to be modular, that is the smallest array could be expanded into the next bigger higher performance array and so forth to the very largest array. The smallest two arrays are single frequency arrays and the larger two are two-frequency capture-effect arrays. During the theoretical study phase, a computer program was developed to assist in analyzing the signal performance in the presence of reflecting surfaces. From this study, this handbook was developed to assist the engineer to make predictions with a minimum of mathematics as to what array to install to give the perforamnce desired or what array is needed to upgrade a present localizer array. Author
- Terminal Flight Facilities
- Electrical and Electronic Equipment
- Air Navigation and Guidance