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	A17.10.3
	A17.10.3

In order to make correctly calculations using the Longley-Rice propagation, model should take into account a number of input parameters describing the weather phenomena, system parameters, sitting criteria, statistical criteria which was shown in the table below.

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	F476
	F476

Figure 476: GUI of the Longley Rice

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	T091
	T091

Table 91: Longley Rice propagation model

Description	Symbol	Type	Unit	Comments
Variation	-

B

Boolean

-

Variation in path loss takes into account the uncertainty of building design, furniture, room size, etc.

Mean surface refractivity

(Ground refractivity)

-

S

Scalar	Ns	Equatorial Continental Subtropical Maritime Subtropical Desert Continental Temperate Maritime Temperate over land Maritime Temperate over sea	360 320 370 280 301 320 350
Terrain irregularity parameter	-

S

Scalar

M

Flat
Plains

Hills
Mountains
Rugged mountains

0
30

90
200

500

Electrical ground Conductivity

-

S

Scalar

S/m

Average ground
Poor ground
Good ground
Fresh water
Sea water

0.005

0.001

0.020

0.010
5

Relative permittivity

-

S

Scalar		Average ground Poor ground Good ground Fresh water Sea water	15 4 25 81 81
Polarisation	-	List	-	0 – horizontal, 1-

vartical

vertical

Sitting

Site Criteria	-	List	-	Random, Careful, Very Careful
Radio climate	-	List	-	Equatorial Continental Subtropical Maritime Subtropical Desert Continental Temperate Maritime Temperate over land Maritime Temperate over sea
Time percentage	-

D

Distribution or

S

Scalar	%	0.01 – 0.99
Location percentage	-

D

Distribution or

S

Scalar

%

0.01 – 0.99

Confidential percentage

Confidence level

-

D

Distribution or

S

Scalar	%	0.01 – 0.99
Mode of variability	-	List	-	Single, individual, broadcast
Standard deviation	Std. dev.

S

Scalar

dB

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