Computed Performance of Glide Slope Arrays on Sites with Limited Ground Plane

The computed performance of four different types of glide slope transmitting arrays sited over idealized ground planes consisting of one-dimensional perfectly conducting strips of various lengths in free space is presented. The idealized ground plane approximates the practical case of a site consisting of an expanse of relatively flat ground plane ending in a precipitous dropoff or in rough diffusely reflecting terrain. The computed results show several phenomena which have repeatedly been observed.     

Disturbance of ILS Localizer Signals by Reflections from Large Hangers

An equation giving the disturbance of ILS localizer signals by reflections from a flat hangar wall is derived, and a computer program for performing the required calculations is discussed. Results calculated for a hypothetical case are presented.     

An Inverted VOR of Small Aperture

A new type of omnirange very-high-frequency omnidirectional radio (VOR), intended to be compatible with existing receivers, is described. It is ``inverted' in the sense that reference phase is transmitted by AM, as in the Doppler VOR (DVOR). Variable phase is radiated as a rotating square-wave FM field, the radiating elements being concentric loop antennas with circumferences equal to integer numbers of wave-lengths. Each loop radiates one term in the Fourier expansion of the variable phase field.