Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Lewis E. Vogler

Abstract: Comparisons of theoretical attenuation based on multiple knifeedge diffraction with measured values of median propagation loss are presented for a number of different propagation paths. In general the knife-edge predictions tend to overestimate received signal strength with most of the differences between predicted and observed. Values lying in the range –12 to +7dB. Use of a computerized topographic data base to generate path profiles for the knife-edge attenuation result in predicted/observed loss differences of about the same magnitude, although spurious results sometimes arise.

Keywords: data comparisons; multiple knife-edge attenuation


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