CONTENTS

Recommendation ITU-R P.1812-7
Policy on Intellectual Property Right (IPR)
Annex 1
�1���� Introduction
�2���� Model elements of the propagation prediction method
�3���� Input parameters
������� 3.1���� Basic input data
������� 3.2���� Radio path profile
����������������� 3.2.1���� Terrain and ground cover data
����������������� 3.2.2���� Terrain and surface data
������� 3.3���� Radio-climatic zones
������� 3.4���� Terminal distances from the coast
������� 3.5���� Basic radio-meteorological parameters
������� 3.6���� Incidence of ducting
������� 3.7���� Effective Earth radius
������� 3.8���� Parameters derived from the path profile analysis
�4���� The prediction procedure
������� 4.1���� General
������� 4.2���� Line-of-sight propagation (including short-term effects)
������� 4.3���� Propagation by diffraction
����������������� 4.3.1���� The Bullington part of the diffraction calculation
����������������� 4.3.2���� Spherical-Earth diffraction loss
����������������� 4.3.3���� First-term part of spherical-Earth diffraction loss
����������������� 4.3.4���� Complete �delta-Bullington� diffraction loss model
����������������� 4.3.5���� The diffraction loss not exceeded for p% of the time
������� 4.4���� Propagation by tropospheric scatter
������� 4.5���� Propagation by ducting/layer reflection
������� 4.6���� Basic transmission loss not exceeded for p% time and 50% locations
���� ���4.7���� Location variability of losses
������� 4.8���� Building entry loss
������� 4.9���� Basic transmission loss not exceeded for p% time and p_L% locations
������ 4.10���� The field strength exceeded for p% time and p_L% locations
Attachment 1 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���� Transmitting antenna horizon elevation angle above the local horizontal, θ_t
������� 5.2���� Transmitting antenna horizon distance, d_lt
������� 5.3���� Receiving antenna horizon elevation angle above the local horizontal, θ_r
������� 5.4���� Receiving antenna horizon distance, d_lr
������� 5.5���� Angular distance θ (mrad)
������� 5.6���� �Smooth-Earth� model and effective antenna heights
����������������� 5.6.1���� Deriving the smooth-Earth surface
����������������� 5.6.2���� Smooth-surface heights for the diffraction model
Attachment 2 to Annex 1� An approximation to the inverse complementary cumulative� normal distribution function
Attachment 3 to Annex 1� An alternative method to calculate the spherical earth diffraction loss L_bulls