Issue regarding attitude tracking for a spacecraft with model uncertainties and external disturbances are addressed. By using the Sliding Mode Control (SMC) design technique, this paper presents a class of improved SMC schemes, which are shown to have the advantages of rapid response and robustness from the classic SMC designs. Besides, the new SMC law is continuous everywhere so that the chattering drawback of the sign-type SMC controller is greatly alleviated. This new scheme also improves the saturation-type SMC's weakness of only achieving uniformly ultimate boundedness performance to an asymptotic stability level. As a result, the improved SMC law enables the spacecraft to perform highly accurate pointing task. Numerical simulations demonstrate the benefits of the proposed SMC scheme.
|Number of pages||6|
|Journal||Chung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology|
|State||Published - 1 May 2009|
- Asymptotic stability.
- Nonlinear systems
- Robust control
- Sliding mode control