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	A17.5
	A17.5

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

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	F469
	F469

Figure 469: SEAMCAT Interface to the Spherical diffraction propagation model

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	T082
	T082

Table 82: 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)		S	dB
Wall loss std dev (indoor -indoor)		S	dB
Wall loss(indoor - outdoor)		S	dB
Wall loss std dev (indoor - outdoor)		S	dB
Loss between adjacent floor		S	dB
Empirical parameters:	b
Size of the room	d_room	S	m
Height of each floor	h_floor	S	m
Water concentration		S	g/m^2
Earth surface admittance
Refraction Index gradient
Refraction layer probability
Time percentage (min)
Time percentage (max)

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