Advantech AMT-70, Инструкция по установке и эксплуатации

Страница: 136 / 160

AMT-70/AMT-73/AMT-75 Installation and Operation
Where:
s = satellite distance from center of earth = 42165Km
e = radius of the earth = 6370Km
a = latitude of antenna (in degrees)
b = longitude of satellite (in degrees)
c = longitude of antenna (in degrees)
d = distance from antenna to satellite (in Km)
The sign of +/- in the azimuth calculation is determined by the relative positions of the antenna and
satellite. 180
°
is due south. If the satellite is east of the antenna the result of the calculation is
subtracted from 180. If the satellite is west of the antenna the result of the calculation is added to 180.
Example: Pointing an antenna at SES-ASTRA 1F (longitude b= +19.3
°
), from London, UK (latitude a =
51.5
°
, longitude c = -1.4
°
)
( )
( )
( ) ( )
o
o
48 . 150
4 . 1 2 . 19 sin 42165 38800 97 . 27 cos
4 . 1 2 . 19 sin 42165
tan 180
97 . 27
38800 6370 2
38800 6370 42165
sin
38800 ) 4 . 1 2 . 19 cos( ) 5 . 51 cos( 6370 41625 2 6370 42165
2 2
1
2 2 2
1
2 2
=
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+ ⋅ − ⋅
+ ⋅
− =
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅ ⋅
− −
=
= + ⋅ ⋅ ⋅ ⋅ − + =
−
−
Azimuth
Elevation
Km d
136