Fading Due to Sea Reflection Model
This model provides an estimate of multipath fading due to sea reflection.
It is only applicable in the frequency range from 1 to 2 GHz and for elevation
angles of 3 degrees or higher. Furthermore, the antenna radiation pattern
in the direction midway between the point of specular reflection and the
horizon must be larger than negative 10 dB.
This model is taken from:
"International Telecommunication Union, 1992 - CCIR Recommendations,
Propagation in Non-Ionized Media", Geneva, 1992, Rec. 680-1, pp.270-1.
Function:
=SeaReflectFade(Theta, Gm, Surface, Frequency, Polarization, P,Selector)
-
Theta- Elevation Angle (deg)
-
Gm- Maximum Antenna Gain (dB)
-
Surface- One of the following:
-
Sea Water (20 deg)
-
Fresh Water (20 deg)
-
Pure Water (20 deg)
-
Ice
-
Frequency- One of the following:
-
1.0 GHz
-
1.5 GHz
-
2.0 GHz
-
Polarization- One of the following:
-
Horizontal
-
Vertical
-
Circular
-
P- Percentage of time amplitude is exceeded- Must be one of the following:
-
0.001
-
0.01
-
0.1
-
1.0
-
10
-
20
-
30
-
40
-
50
-
60
-
70
-
80
-
90
-
95
-
98
-
99
-
99.5
-
99.8
-
99.9
-
99.95
-
99.98
-
99.99
-
99.995
-
99.998
-
Selector- One of the following:
-
G- Relative Antenna Gain Midway between the horizon and the point of
specular reflection (dB)
-
RH- Reflection Coefficient for Horizontal Polarization
-
RV- Reflection Coefficient for Vertical Polarization
-
RC- Reflection Coefficient for Circular Polarization
-
C(theta)- Correction Factor (dB)
-
Pr (dB)
-
Fading Depth (dB)
Example:
=SeaReflectFade(5,10,1,1,1,3,1) would return the relative antenna
Gain (G) in dB
Back To Main Help