Download - Satellite Communications Lecture 3
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Satellite Communications Lecture 3
Look Angle
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Look Angle Determination
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Look Angle Definition
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Definitions (Contd.)
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Calculating Look Angle
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Coordinate System
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Coordinate System
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Satellite Coordinates
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Review of Geometry
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Geometry of Elevation Angle
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Central Angle
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Elevation Angle Calculation
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Example: Elevation Angle for GEO Satellite
Using rs = 42,164 km and re = 6,378.14 km gives
d = 42,164 [1.0228826 -0.3025396 cos(γ)]1/2 kmWhich finally gives the elevation angle
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Azimuth Angle Calculation More complex approach for non-geo
satellites. Different formulas and corrections apply
depending on the combination of positions of the earth station and subsatellite point with relation to each of the four quadrants (NW, NE, SW, SE).
Its calculation is simple for GEO satellites
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Azimuth Angle Calculation for GEO Satellites SUB-SATELLITE POINT
Equatorial plane, Latitude Ls = 0o Longitude ls
EARTH STATION LOCATION Latitude Le Longitude le
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Azimuth Angle for GEO sat.
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Azimuth Angle for GEO sat.
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Azimuth Angle for GEO sat.
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Example for Look Angle Calculation of a GEO satellite
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Example (Contd.)
El=5.85o
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Example (Contd.)
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Example (Contd.)