Abstract
A simplified method of computing knife edge diffraction in the shadow region is presented which is applicable to most obstacle gain paths, that is, paths with a dominant mountain obstacle. The method has been worked out for 1) the four-ray model-specular reflection on each side of the obstacle, 2) the two-ray model-reflection on one side only, and 3) the single-ray model-no reflection on either side. The obstacle can be at any location along the path. The accuracy is within 2 db for path geometries such that the usual diffraction parameter <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\nu</tex> is greater than 1 and the two terminal heights are less than the obstacle height. Curves which further simplify the computation procedure are presented.
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