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Ground Control

Andrew Bourgeois Aaron Minard. Ground Control. Background. Data transmitted at the speed of light in a straight line. Satellites used to avoid curve of the earth If not geostationary, moves across the sky. . http://streamsurfers.netfirms.com/faq/faq0001_how_it_works.htm. SatPC32.

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Ground Control

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  1. Andrew Bourgeois Aaron Minard Ground Control

  2. Background • Data transmitted at the speed of light in a straight line. • Satellites used to avoid curve of the earth • If not geostationary, moves across the sky. http://streamsurfers.netfirms.com/faq/faq0001_how_it_works.htm

  3. SatPC32 • Calculates the tracks of earth orbiting satellites. • Calculations are based on the SGP4/SDP4 model, highly accurate. • Simplified General Perturbations Satellite Orbit Model 4 (NASA/NORAD)

  4. SatPC32

  5. CubeSat Satellite • Developed by Cal Poly and Stanford University • 10cm3 and has a mass of 1kg • Powered by photovoltaic cells and rechargeable batteries • Usually launched piggyback to commercial satellites • Costs $30,000 to $50,000 to build and the same amount to ride piggybacked on a commercial satellite.

  6. Problem • Track a low orbit satellite from horizon to horizon • Move a 3 meter satellite dish • Interface to SatPC32

  7. Solutions • Gears and motor • Motor controllers to interface with SatPC32 • Digital Encoders to control position of the dish • Use/Modify existing designs for elevation and azimuth control

  8. System Diagram

  9. Analysis COMING SOON • Force due to wind • Inertial Force • Gear calculations

  10. Analysis

  11. Elevation Mounting Bracket WormGear Worm Sensor Gear

  12. Azimuth Sensor Gear Mounted Roller Bearing Worm Gear Worm

  13. Electrical

  14. Programming

  15. Questions?

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