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A three-degree-of-freedom helicopter attitude tracking control system can be described as a multi-input multi-output strict-feedback form system with unknown parameters, bounded disturbances, and nonlinear uncertain cross-couplings. Both norm-bounded and nonlinear uncertainties are discussed. The whole nonlinear system is divided into a nominal disturbance-free system and an equivalent disturbance...
In this paper, a new sliding mode disturbance observer (SMDO) is developed using the terminal sliding mode technique. The SMDO is employed to estimate unknown external disturbances and modeling uncertainties in finite time. Based on the designed SMDO, a boundary layer adaptive sliding mode attitude control scheme is proposed for near-space vehicles (NSVs). The designed attitude control scheme can...
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