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
Step 1: Input data
Step 2: Selecting average year or worst-month prediction
Step 3: Radiometeorological data
Large bodies of inland water
Large inland lake or wet-land areas
Effective Earth radius
Step 4: Path profile analysis
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
Case 1. Path is LoS
Case 2. Path is transhorizon
4.2.2 Spherical-Earth
diffraction loss
Start of calculation to be performed twice, as described
above:
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
(Notes 1 and 2)
4.4 Ducting/layer
reflection
4.5 Additional clutter
losses
4.5.1 General
4.5.2 Clutter
categories
4.5.3 The
height-gain model
4.5.4 Method of
application
4.6 The overall prediction
4.7 Calculation of
transmission loss
5 Hydrometeor-scatter
interference prediction
5.1 Introduction
5.2 Input parameters
5.3 The step-by-step
procedure
Step 1: Determination of meteorological parameters
Step 2: Conversion of geometrical parameters to plane-Earth
representation
Step 3: Determination of link geometry
Step 4: Determination of geometry for antenna gains
Step 5: Determination of path lengths within the rain cell
Step 6: Attenuation outside the rain cell
Step 7: Numerical integration of the scatter transfer function
The extended trapezoidal rule
Step 8: Determination of other loss factors
Step 9: Determination of the cumulative distribution of
transmission loss
1 Introduction
2 Maps of vertical variation of
radio refractivity data and surface refractivity
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
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