Standard Propagation
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Standard Propagation
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The propagation
of radio
energy over a smooth spherical earth of uniform dielectric constant and
conductivity under conditions of standard refraction
in the atmosphere, i.e., an atmosphere in which the index of refraction
decreases uniformly with height at a rate of 12 N-units per 1000 feet. See superstandard
propagation, substandard
propagation, standard
atmosphere.
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Standard propagation results in a ray curvature due to refection which
has a value approximately one-fourth that of the earth's curvature, giving a
radio horizon which is about 15 percent greater than the distance to the
geometrical horizon. This is equivalent to straight-line propagation over a
fictitious earth whose radius is four-thirds the radius of the actual earth.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
