A spherical propagation model based on various ITU-R Recs 452, 676 and 526 is applied in SEAMCAT for larger distances and higher frequencies

Figure 474: SEAMCAT Interface to the Spherical diffraction propagation model

Table 83: Spherical diffraction propagation model

Description	Symbol	Type	Unit	Comments
Variation				Variation in path loss takes into account the uncertainty of building design, furniture, room size, etc.
Wall loss (indoor - indoor)		Scalar	dB
Wall loss std dev (indoor - indoor)		Scalar	dB
Wall loss (indoor - outdoor)		Scalar	dB
Wall loss std dev (indoor - outdoor)		Scalar	dB
Loss between adjacent floor		Scalar	dB
Empirical parameters:	b
Size of the room	d_room	Scalar	m
Height of each floor	h_floor	Scalar	m
Water concentration		Scalar	g/m^2
Earth surface admittance
Refraction Index gradient
Refraction layer probability
Time percentage (min)
Time percentage (max)

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