Division Calculation of the term Δ ground(S,O)

where

• A_ground(S,O) is the attenuation due to the ground effect between the source S and the diffraction point O. This term is calculated as indicated in the previous subsection on calculations in homogeneous conditions and in the previous subsection on calculation in favourable conditions, with the following hypotheses:

  z_r = z_o,s ,

• G_path is calculated between S and O,

• In homogeneous conditions: Ḡ_w = G′_path in equation (2.5.17), Ḡ_m = G′_path in equation (2.5.18),

• In favourable conditions: Ḡ_w = G_path in equation (2.5.17), Ḡ_m = G′_path in equation (2.5.20),

• Δ _dif(S′,R) is the attenuation due to the diffraction between the image source S′ and R, calculated as in the previous subsection on pure diffraction,

• Δ _dif(S,R) is the attenuation due to the diffraction between S and R, calculated as in Subsection VI.4.4.b.