RADIO-WAVE REFLECTIONS FROM A SPHERICAL EARTH - PREDICTIONS AT VHF AND UHF

Authors
  1. Whitteker, J.H.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
The field strength of radio waves at VHF and UHF can be affected by reflections from the ground or water. Except for the shortest paths, the reflecting surface must be considered to be spherical rather than flat. The report describes procedures that may be programmed into a computer for automatically finding the reflection point, for calculating the effective coefficient of reflection, and for estimating the effect of any obstructions in the path of the reflected ray. The description is intended to be complete enough to be used for writing a computer program to do the calculations. New formulas are derived, and references are given for formulas obtained elsewhere. A comparison of the results with CCIR curves for propagation around a spherical earth shows agreement within about 1 dB in the region for which reflection calculations are used.
Report Number
TN-715 —
Date of publication
15 Nov 1982
Number of Pages
30
DSTKIM No
83-01118
CANDIS No
39074
Format(s):
Hardcopy;Originator's fiche received by DSIS

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