Annex 1
1 Introduction
2 Basic concepts
2.1
Fresnel
ellipsoids and Fresnel zones
2.2
Penumbra
width
2.3
Diffraction
zone
2.4
Obstacle
surface smoothness criterion
2.5 Isolated obstacle
2.6
Types
of terrain
2.7
Fresnel
integrals
3 Diffraction over a
spherical Earth
3.1
Diffraction
loss for over-the-horizon paths
3.1.1
Numerical
calculation
3.1.2
Calculation
by nomograms
3.2
Diffraction
loss for LoS paths with sub-path diffraction
4 Diffraction over
isolated obstacles
4.1
Single
knife-edge obstacle
4.2
Single
rounded obstacle
4.3 Double isolated edges
4.4
Multiple
isolated obstacles
5 Diffraction by thin
screens
5.1 Finite-width screen
5.2
Diffraction
by rectangular apertures and composite apertures or screens
6 Diffraction over a
finitely conducting wedge
7 Guide to propagation by
diffraction
Appendix 1
to Annex 1 - Calculation of cylinder parameters
1 Diffraction angle and
position of vertex
2 Cylinder parameters
Appendix 2
to Annex 1 - Sub-path diffraction losses
1 Introduction
2 Method