December 1976 | NTIA Technical Report OT-76-107
Harold T. Dougherty; Burgette A. Hart
Abstract: This report presents some estimates of the enhanced fields deduced from the presently available theory and observational data. The fields of interest are the enhanced fields that are encountered in the presence of the stratified atmosphere, the ducting conditions associated with supercritical refractivity gradients both near the surface and aloft. As a basis for estimating the likelihood of occurrence of these supportive conditions, the available information is surveyed. It is suggested that the access to computers and the availability of historical radiosonde data be exploited and the pertinent characteristics of elevated layers and their associated ducts be mapped on a worldwide basis to meet the interference prediction requirements of regulatory agencies.
Keywords: interference; propagation; fading; anomalous propagation; radio signals; ducting
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