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Abstract : Co-channel and adjacent-channel interference predictions for the Instrument Landing System are presented. Information on the various types of ground facilities involved is given first. Propagation mechanisms applicable to the 108 to 112 Mc/s frequency range are discussed second together with the calculation of transmission loss and its variability. Third, the statistical treatment of interference problems is explained. Finally, the results of the study are presented as curves of normalized desired-to-undesired signal strength ratios versus distance from the desired station. Aircraft altitudes of 1,000, 6,250, 12,000, and 18,000 feet along with station separations ranging from 20 to 330 nautical miles were considered. Detailed procedures, mathematical formulas, and computer programs used are discussed. (Author)

Interference predictions for the instrument landing system