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Tracking Low Orbit Satellites: Innovations in Satellite Dish Control Systems

Explore the innovative methods to track low orbit satellites using SatPC32 software and a 3-meter satellite dish. This guide details the challenges of tracking these fast-moving satellites across the horizon, as well as the necessary mechanical designs, including gear systems and motor controllers for precise positioning. The CubeSat technology, developed by Cal Poly and Stanford University, revolutionizes satellite capabilities. Learn about the applications of photovoltaic cells and rechargeable batteries in CubeSats, and gain insights into the physics behind satellite tracking and control.

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Tracking Low Orbit Satellites: Innovations in Satellite Dish Control Systems

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Presentation Transcript

  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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