Propagation Effects Handbook for Satellite Systems - DESCANSO ...

. .
The equivalent heights for oxygen, hO, and water vapor, hW, are
determined from:
hw =
[
2.2 +
hO=6km
hO=6+
for f < 57 GHz
40 km for 63 < Y < 350 GHz
(f - 118.7) 2
+ 1
(6.2-10)
3 1 1
(Y - 22.3) 2
km
+ 3 ‘(f- ‘(f- 1
183.3) 2
for f c 350 GHz
+ 1 323.8) 2
+ 1
(6.2-11)
The total slant path gaseous attenuation through the atmosphere, AE,
is then found.
with
For () ~ 10°:
For 6 < 10°:
A~ =
.—ho
h,
+
Y. ho e VW hw
sir 0
YO ho VW hw
AE=—
9 (ho)
+
9(%)
g(h) = 0.661% + 0.3394 ~ + 154h5.5
d
h~
4250
x = sin2El + —
where h is replaced by ho or hW as appropriate.
6-15
dB
dB
(6.2-12)
(6.2-13)
(6.2-14)
(6.2-15)