Policy on Intellectual Property Right (IPR)
Annex� Wide-range propagation model� Description of the calculation
method
�1����
Introduction
������� 1.1����
Applicability
������� 1.2����
Reciprocity, and the designation of terminals
������� 1.3����
Iteration
������� 1.4����
Organization of the document
������� 1.5����
Style of description
�2����
Inputs
������� 2.1����
Terrain profile
������� 2.2����
Other inputs
������� 2.3����
Constants
�3����
Preliminary calculations
������� 3.1����
Limited percentage times
������� 3.2����
Path length, intermediate points, and fraction over sea
������� 3.3����
Antenna altitudes and path inclination
������� 3.4����
Climatic parameters
����������������� 3.4.1����
Refractivity in the lowest 1 km
����������������� 3.4.2����
Refractivity in the lowest 65 m
����������������� 3.4.3����
Precipitation parameters
������� 3.5����
Effective Earth-radius geometry
������� 3.6����
Wavelength
������� 3.7����
Path classification and terminal horizon parameters
Case 1. Path is LoS
Case 2. Path is NLoS
Continue for both cases
������� 3.8����
Effective heights and path roughness parameter
������� 3.9����
Tropospheric-scatter path segments
������ 3.10����
Gaseous absorption on surface paths
������ 3.11����
Free-space basic transmission loss
������ 3.12����
Knife-edge diffraction loss
�4����
Obtaining predictions for the principal sub-models
������� 4.1����
Sub-model 1. Normal propagation close to the surface of the Earth
������� 4.2����
Sub-model 2. Anomalous propagation
������� 4.3���
�Sub-model 3. Troposcatter propagation
������� 4.4����
Sub-model 4: Sporadic-E
�5����
Combining sub-model results
������� 5.1����
Combining sub-models 1 and 2
������� 5.2����
Combining sub-models 1 + 2, 3 and 4
������� 5.3����
Combining sub-models within a Monte-Carlo simulator
Appendix A� Diffraction loss
������� A.1����
Introduction
������� A.2����
Spherical-Earth diffraction loss
������� A.3����
First-term spherical-Earth diffraction loss
Start of calculation to be performed twice
������� A.4����
Bullington diffraction loss for actual profile
Case 1. Path is LoS for effective Earth curvature not exceeded for p%
time
Case 2. Path is NLoS for effective Earth curvature not exceeded for p%
time
������� A.5����
Bullington diffraction loss for a notional smooth profile
Case 1. Path is LoS for effective Earth radius exceeded for p% time
Case 2. Path is NLoS for effective Earth radius exceeded for p% time
Appendix B� Clear-air enhancements and fading
������� B.1����
Introduction
������� B.2����
Characterize multi-path activity
For LoS path:
For NLoS path:
������� B.3����
Calculation of the notional zero-fade annual percentage time
������� B.4����
Percentage time a given clear-air fade level is exceeded on a surface
path
������� B.5����
Percentage time a given clear-air fade level is exceeded on a
troposcatter path
Appendix C� Precipitation fading
������� C.1����
Introduction
������� C.2����
Preliminary calculations
������� C.3����
Percentage time a given precipitation fade level is exceeded
������� C.4����
Melting-layer model
������� C.5����
Path-averaged multiplier
Appendix D� Anomalous/layer-reflection model
������� D.1����
Characterize the radio-climatic zones dominating the path
Large bodies of inland water
Large inland lake or wet-land areas
������� D.2��
��Point incidence of ducting
������� D.3����
Site-shielding losses with respect to the anomalous propagation
mechanism
������� D.4����
Over-sea surface duct coupling corrections
������� D.5����
Total coupling loss to the anomalous propagation mechanism
�� �����D.6����
Angular-distance dependent loss
������� D.7����
Distance and time-dependent loss
������� D.8����
Basic transmission loss associated with ducting
Appendix E� Troposcatter
������� E.1���� Introduction
������� E.2����
Climatic classification
��� ����E.3����
Calculation of troposcatter basic transmission loss
Appendix F� Attenuation due to gaseous absorption
������� F.1����
Introduction
������� F.2����
Gaseous absorption for surface path
������� F.3����
Gaseous absorption for a troposcatter path
� ������F.4����
Gaseous absorption for terminal/common-volume troposcatter path
������� F.5����
Water-vapour density in rain
������� F.6����
Specific sea-level attenuations
Appendix G� Sporadic-E propagation
������� G.1����
Derivation of foEs
������� G.2���
�1-hop propagation
������� G.3����
2-hop propagation
������� G.4����
Basic transmission loss
Appendix H� Great-circle path calculations
������� H.1����
Introduction
������� H.2����
Path length and bearing
������� H.3����
Calculation of intermediate path point
Appendix I� Iterative procedure to invert a cumulative distribution
function
������� I.1����
Introduction
������� I.2����
Iteration method
Stage 1: setting the search range
Stage 2: binary search
Appendix J� Structure of the wide-range propagation model
������� J.1����
Introduction
������� J.2����
Combining the sub-models