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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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Figure 469474: SEAMCAT Interface to the Spherical diffraction propagation model

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Table 8283: Spherical diffraction propagation model

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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

S

dB

 S


Wall loss std dev (indoor - indoor)

 


Scalar

dB

 


Wall loss (indoor - outdoor)

 

S


Scalar

dB

 


Wall loss std dev (indoor - outdoor)

 

S


Scalar

dB

 S


Loss between adjacent floor

 


Scalar

dB

 


Empirical parameters:

b

 

 

 




Size of the room

droom

S

Scalar

m

 


Height of each floor

hfloor

S

Scalar

m

 


Water concentration

 


Scalar

S

g/m^2

 


Earth surface admittance

 

 

 

 





Refraction Index gradient

 

 

 

 





Refraction layer probability

 

 

 

 





Time percentage (min)

 

 

 

 





Time percentage (max)

 

 

 

 

 

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