Recommendation ITU-R P.452-18
Policy on Intellectual Property Right (IPR)
1 Introduction
2 Interference propagation mechanisms
3 Clear-air interference prediction
3.1 General comments
3.2 Deriving a prediction
3.2.1 Outline of the procedure
4 Clear-air propagation models
4.1 Line-of-sight propagation (including short-term effects)
4.2 Diffraction
4.2.1 The Bullington part of the diffraction calculation
4.2.2 Spherical-Earth diffraction loss
4.2.3 Complete ‘delta-Bullington’ diffraction loss model
4.2.4 The diffraction loss not exceeded for p% of the time
4.3 Tropospheric scatter
4.4 Ducting/layer reflection
4.5 The overall prediction
4.6 Calculation of transmission loss
5 Hydrometeor-scatter interference prediction
5.1 Theoretical basis of transmission loss due to hydrometeor
scatter
5.2 The model input parameters
5.2.1 Link geometric parameters
5.3 Steps of applying the hydrometeor scatter algorithm
5.3.2 Step 2: Constructing a local raindrop bi-static
cross section
5.3.3 Step 3: Constructing hydrometeor scatter geometry
5.3.4 Step 4: Constructing the scattering transfer
function elements
5.3.5 Step 5: Integration of the scatter transfer
function
5.3.6 Tables for section 5.3.1.2
5.3.7 Tables for section 5.3.2
Attachment 1 to Annex 1 Radio-meteorological data required for the clear-air
prediction procedure
1 Introduction
2 Maps of vertical variation of radio refractivity data and surface
refractivity
Attachment 2 to Annex 1 Path profile analysis
1 Introduction
2 Construction of path profile
3 Path length
4 Path classification
5 Derivation of parameters from the path profile
5.1 Trans-horizon paths and LoS paths
5.1.1 Interfering antenna horizon elevation angle, θt
5.1.2 Interfering antenna horizon distance, dlt
5.1.3 Interfered-with antenna horizon elevation
angle, θr
5.1.4 Interfered-with antenna horizon distance, dlr
5.1.5 Angular distance θ (mrad)
5.1.6 “Smooth-Earth” model and effective antenna heights
Attachment 3 to Annex 1 An approximation to the inverse cumulative normal
distribution function for x £ 0.5