Accession Number : ADA138228

Title :   Instrument Landing System Critical Area Studies.

Descriptive Note : Final rept.,


Personal Author(s) : McFarland,R H ; Longworth,J D

PDF Url : ADA138228

Report Date : Nov 1983

Pagination or Media Count : 197

Abstract : Theoretical and experimental studies have been performed to determine the perturbational effects on glide slope and localizer course structures. The effects are those produced by aircraft parked in front of the transmitting antennas. Contours are given which indicate the maximum path irregularity for a particular ILS zone given a specific size aircraft, its location and orientation. From these, critical - area designations for particular airdromes can be determined. Special concerns have been given to the effects of the Boeing 747 on the performance of the Cat III, two-frequency localizer and on the 8- and 14- element, single-frequency systems. Also, effects of general aviation type aircraft on the null-reference glide slope have been calculated and measured.

Descriptors :   *Microwave landing systems, Radio reception, Glide path systems, Radio transmission, Anomalies, Radio signals, Scattering, Radio interference, Glide slope, Distortion, Perturbations, Aircraft, Ground level

Subject Categories : Air Navigation and Guidance
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE