The aspect sensitivity of man‐made, field‐aligned ionospheric irregularities implies that the geometry of VHF communications circuits using these scatterers must be carefully designed. The design problem is sufficiently complex that it is best approached with the aid of a computerized model. Examples are presented showing the results of path modeling for man‐made clouds located in Colorado and in Italy. The effects of variations in cloud height and communications circuit frequency are evident from these examples. It is concluded that geometric restrictions are sufficiently strong as to limit the application of the technique to certain specialized point‐to‐point or point‐to‐zone uses.
This technical report was prepared by the Science and Technology Division, General Research Corporation, under Naval Weapons Center Contract N00123-75-C-0320 and documents work conducted from May 1976 to December 1976. The Naval Air Systems Command is sponsoring a program on the image quality of cockpit displays, with application to A-6E TRAM, A-7E FLIR, and other airborne target acquisition systems. The work has included in-house laboratory research, simulation studies, and flight tests, under the direction of CDR P. Chatelier (AIR-340F). The study reported here was supported by NAVAIRSYSCOM AirTask A03P.3400/008B/7F55-525-000. This report has been reviewed for technical accuracy by Dr. H. H. Bailey, The Rand Corporation, and Ronald A. Erickson, Naval Weapons Center.
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