RECOMMENDATION ITU-R P.526-6 - PROPAGATION BY DIFFRACTION
ANNEX 1
1 Introduction
2 Fresnel ellipsoids and Fresnel zones
3 Diffraction over a spherical earth
    3.1 Numerical calculation
    3.2 Calculation by nomograms
4 Diffraction over obstacles and irregular terrain
    4.1 Single knife-edge obstacle
    4.2 Finite-width screen
    4.3 Single rounded obstacle
    4.4 Double isolated edges
    4.5 General method for one or more obstacles