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