Attitude Determination and Control

1. Attitude Determination and Control Karla Vega University of California, Berkeley

2. Outline • Requirements • Hardware • Attitude Determination • Dynamics • Attitude Control • Types • Disturbances • Integration and Test • Summary • ACS in CubeSats • CINEMA *Lecture notes from Dr. Glenn Lightsey’s Spacecraft Dynamics and Controls Graduate Course at University of Texas at Austin TRIO-CINEMA Meeting

3. Getting Underway TRIO-CINEMA Meeting

4. Requirements and Flowdowns TRIO-CINEMA Meeting

5. Tree Diagram TRIO-CINEMA Meeting

6. Impact of ACS on S/C Configuration TRIO-CINEMA Meeting

7. Some Standard Configurations TRIO-CINEMA Meeting

8. Hardware TRIO-CINEMA Meeting

9. Star Sensors TRIO-CINEMA Meeting

10. Earth Sensors TRIO-CINEMA Meeting

11. Earth Sensors Cont. TRIO-CINEMA Meeting

12. Sun Sensors TRIO-CINEMA Meeting

13. Magnetometers TRIO-CINEMA Meeting

14. GPS TRIO-CINEMA Meeting

15. Typical External Sensor Performance TRIO-CINEMA Meeting

16. Gyros TRIO-CINEMA Meeting

17. TRIO-CINEMA Meeting

18. TRIO-CINEMA Meeting

19. Typical Gyro Performance TRIO-CINEMA Meeting

20. Typical Inertial Sensor Performance TRIO-CINEMA Meeting

21. Sensor Selection TRIO-CINEMA Meeting

22. Sensor Selection Continued TRIO-CINEMA Meeting

23. Actuators • Torque Coils • Wheels • Reaction Wheels • Momentum Wheels • Controlled Moment Gyros • Thrusters TRIO-CINEMA Meeting

24. Wheels TRIO-CINEMA Meeting

25. Wheels Continued TRIO-CINEMA Meeting

26. Thrusters TRIO-CINEMA Meeting

27. Thrusters Continued TRIO-CINEMA Meeting

28. Attitude Determination and Control TRIO-CINEMA Meeting

29. Attitude Determination • Frames of Reference • Parameterization • Geometry • Estimation • Statistics • Observability TRIO-CINEMA Meeting

30. Attitude Parameterization TRIO-CINEMA Meeting

31. Propagating Attitudes TRIO-CINEMA Meeting

32. Propagating Euler Angles TRIO-CINEMA Meeting

33. Propagating Quaternions TRIO-CINEMA Meeting

34. Geometry of Attitude Determination TRIO-CINEMA Meeting

35. Implementation TRIO-CINEMA Meeting

36. Implementation Continued TRIO-CINEMA Meeting

37. Implementation Continued TRIO-CINEMA Meeting

38. Estimation Theory: combining several measurement TRIO-CINEMA Meeting

39. Dynamics: Euler’s Equations TRIO-CINEMA Meeting

40. Integration TRIO-CINEMA Meeting

41. Attitude Control TRIO-CINEMA Meeting

42. Disturbances TRIO-CINEMA Meeting

43. Some Typical Disturbance Torque Magnitudes TRIO-CINEMA Meeting

44. Gravity Gradient TRIO-CINEMA Meeting

45. Gravity Gradient, circular orbit TRIO-CINEMA Meeting

46. Stability Diagram for GG in circular Orbit TRIO-CINEMA Meeting

47. Effects of Elliptical Orbits TRIO-CINEMA Meeting

48. Design of GG Satellites TRIO-CINEMA Meeting

49. Magnetic Attitude Control TRIO-CINEMA Meeting

50. Magnetic Controls, Continued TRIO-CINEMA Meeting