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Q: How is earth curvature correction calculated?
A: TAP software which uses radial elevation data (for plotting radial profiles, computing radio propagation obstruction losses, etc.) allows elevation values to be corrected for earth curvature, including atmospheric diffraction effects.
The formula used for elevation correction is:
(1) Ecorr = E + (78.5/k) x 10-3 x D x(P-D)
Ecorr is the corrected elevation in meters.
E is the actual elevation in meters.
k is the curvature correction factor to compensate for atmospheric diffraction, typically 4/3 for most radio propagation applications. To ignore atmospheric diffraction, use a value of 1.0 for this factor.
D is the horizontal distance along the path from the primary site to the point being corrected (in kilometers).
P is the distance from the site to the end of the path (in kilometers).
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