Policy on Intellectual Property Right (IPR)
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
a)
Smooth terrain
b)
Isolated obstacles
c)
Rolling 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 any distance at 10 MHz and above
4
Diffraction over isolated obstacles or a general terrestrial path
4.1
Single knife-edge obstacle
4.2
Single rounded obstacle
4.3
Double isolated edges
4.4
Multiple isolated cylinders
4.5
Method for a general terrestrial path
4.5.1
Bullington model
Case 1. Path is LoS
Case 2. Path is trans-horizon
4.5.2
Complete method
5
Diffraction by thin screens
5.1
Finite-width screen
5.2
Diffraction by rectangular apertures and composite apertures or screens
5.2.1
Diffraction by a single rectangular aperture
5.2.2
Diffraction by composite apertures or screens
6
Diffraction over a finitely conducting wedge
7
Guide to propagation by diffraction
Attachment 1 to Annex 1 Calculation of cylinder parameters
1
Diffraction angle and position of vertex
2
Cylinder parameters
Attachment 2 to Annex 1 Sub-path diffraction losses
1
Introduction
2
Method