Propagation Effects Handbook for Satellite Systems - DESCANSO ...

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9
s@EQ - If Z S D, compute the total attenuation due to rain
exceeded for P % of the time using
A=
kRp@ #Z~.1
—-
Cose UQ
[
where A= Total path attenuation
k, a = parameters relating
(from Step 5).
RP = point rain rate
e = elevation angle of path
)(cYeWcY
ya
+
~YDa
due to rain (dB)
yu ;6;10”
(6.3-8)
1
the specific attenuation to rain rate
D = horizontal path projection length (from step 4)
If D< Z,
If D = 0,0 = 90°,
~a em-l
A=
Cos e [1 Ua
(6.3-9)
A=” (H - Hg)(K RPa) (6.3-10)
This procedure results in an analytical estimate for the
attenuation, A, exceeded for P percent of an average year. The use
of a programmable calculator or computer for performing these
calculations is highly recommended.
6.3.2.2” A Sample Calculation for the Global Model. The following
information is given for the Rosman~ NC Earth Station operating with
the ATS-6 satellite.
Earth station latitude :.
Earth station longitude:
Earth station elevation:
6-29
35°N
277°E.
0.9 km