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