Theoretical Investigation of Single-Frequency 8-Element Localizer Signal Scattering for Critical Area Determination.
OHIO UNIV ATHENS AVIONICS ENGINEERING CENTER
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A theoretical investigation of the log-periodic, 8-element, single-frequency localizer has been performed to establish critical area criteria for all categories of ILS operation. Contour maps are provided which predict the peak localizer CDI perturbation in each ILS zone for various sizes, locations, and orientations of scatterer aircraft in the vicinity of the localizer transmitting array. Also, plots are provided indicating locations at which the presence of an interfering aircraft will cause the radiated signal of the 8-element localizer to exceed Category I, Category II, or Category III tolerances, specified in U.S. Flight Inspection Manual 8200.1. Additionally, comparative data for the log-periodic, 14-element, single-frequency localizer are presented.
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