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## Antenna look anglesDetermination of the Azimuth and Elevation angles (Look Angles)
Figure-1 shows spherical triangle bounded by points N, ES, and SS. Here ES denotes the earth station. The point s denotes the satellite in geostationary orbit, and point SS the sub satellite point. To solve this triangle we have to use Napier’s rules. By solving we get following results. Let l B can not exceed a theoretical limit of 81.3
(a) l These do not take into account the case when the earth station is on the equator. Obviously, when the sub-satellite, the elevation is 90 To find the range and elevation, it is necessary first to find side c of the quadrantal spherical triangle, and then use this in the plane triangle shown in fig. side c is obtained using the rule. The equatorial radius R Here R The plane triangle shown in fig-2 can be solved using the plane trigonometry. Applying the cosine rule gives the distance d as. The elevation angle is denoted by EI deg in fig . Application of the sine rule to the plane triangle gives
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