Model Identification and Attitude Control Methodology for the Flexible Body of a Satellite

  • Lho, Young-Hwan
  • Published : 2010.09.15


The controller of a model reference adaptive control monitors the plant's inputs and outputs to acknowledge its characteristics. It then adapts itself to the characteristics it encounters instead of behaving in a fixed manner. An important part of every adaptive scheme is the adaptive law for estimating the unknown parameters on line. A more precise model is required to improve performance and to stabilize a given dynamic system, such as a satellite in which performance varies over time and the coefficients change due to disturbances, etc. After model identification, the robust controller ($H{\infty}$) is designed to stabilize the rigid body and flexible body of a satellite, which can be perturbed due to disturbance. The result obtained by the $H{\infty}$ controller is compared with that of the proportional and integration controller which is commonly used for stabilizing a satellite.


Satellite attitude control;Adaptive control;Model identification;Proportional and integration controller;Robust controller ($H{\infty}$)


  1. Dorato, P., Park, H. B., and Li, Y. (1989). An algorithm for interpolation with units in H-infinity, with applications to feedback stabilization. Automatica, 25, 427-430.
  2. Giarre, L., Milanese, M., and Taragna, M. (1997). H-infinity identification and model quality evaluation. IEEE Transactions on Automatic Control, 42, 188-199.
  3. Ioannou, P. A. and Datta, A. (1991). Robust adaptive control: a unified approach. Proceedings of the IEEE, 79, 1736-1768.
  4. Jin, I. M., Lho, Y. H., and Kim, Z. C. (1994). A study on the attitude control techniques of Koreasat. Korea Automatic Control Conference, Daejeon, Korea. pp. 18-20.
  5. kimura, H. (1984). Robust stabilizability for a class of transfer functions. IEEE Transactions on Automatic Control, 29, 788-793.
  6. KOMPSAT. (1996). KOMPSAT. Attitude & Orbit Control Subsystem Critical Design Audit, 1st edition
  7. Kosut, R. L. and Safonov, M. G. (2001). Editorial: Adaptive control, with confidence. International Journal of Adaptive Control and Signal Processing, 15, 429-429.
  8. Lho, Y. H., Jin, I. M., and Kim, H. D. (1998). A robust control of LEO satellites. Proceedings of the 13th Korea Automatic Control Conference, Busan, Korea. pp. 15-17.
  9. Phillips, C. L. and Harbor, R. D. (2000). Feedback Control Systems. 4th ed. Upper Saddle River, N.J.: Prentice Hall. p. 405.
  10. Tsao, T., Brozenec, T., and Safonov, M. G. (2003). Unfalsified adaptive spacecraft attitude control. Proceedings of AIAA Guidance, Navigation and Control Conference, Austin, TX. AIAA-2003-5828.