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Satellite Communications Lecture 3

Satellite Communications Lecture 3. Look Angle. Look Angle Determination. Look Angle Definition. Definitions (Contd.). Calculating Look Angle. Coordinate System. Coordinate System. Satellite Coordinates. Review of Geometry. Geometry of Elevation Angle. Central Angle.

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Satellite Communications Lecture 3

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  1. Satellite Communications Lecture 3 Look Angle

  2. Look Angle Determination

  3. Look Angle Definition

  4. Definitions (Contd.)

  5. Calculating Look Angle

  6. Coordinate System

  7. Coordinate System

  8. Satellite Coordinates

  9. Review of Geometry

  10. Geometry of Elevation Angle

  11. Central Angle

  12. Elevation Angle Calculation

  13. 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 km Which finally gives the elevation angle

  14. 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

  15. Azimuth Angle Calculation for GEO Satellites • SUB-SATELLITE POINT • Equatorial plane, Latitude Ls = 0o • Longitude ls • EARTH STATION LOCATION • Latitude Le • Longitude le

  16. Azimuth Angle for GEO sat.

  17. Azimuth Angle for GEO sat.

  18. Azimuth Angle for GEO sat.

  19. Example for Look Angle Calculation of a GEO satellite

  20. Example (Contd.) El=5.85o

  21. Example (Contd.)

  22. Example (Contd.)

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