November 1982 | NTIA Technical Report TR-82-108
Comparisons of Observed Propagation Loss with Predictions from Multiple Knife-Edge Attenuation
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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