Anita G. Longley

Abstract: This report reviews much of the earlier work on radio propagation in urban areas, including a good deal of data from measurement programs, careful studies of multipath propagation, and techniques to reduce multipath fading. A number of investigators have also developed propagation models for use in urban areas. Most of these are largely empirical, and are presented as curves with various correction factors for antenna height, frequency and terrain irregularity. The present report describes a model, intended for use with a digital computer, which provides a rapid means for calculating both the median attenuation and the location variability expected in urban areas. The model has been tested against measured values and is applicable for a wide variety of conditions.

Keywords: irregular terrain; radio propagation; broadcast systems; land-mobile systems; location variability; urban communications

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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