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Anti-saturated attitude control algorithm of reentry vehicles

A novel adaptive sliding mode control method is proposed in this paper, which solves the problem of attitude precision tracking of reentry vehicles when existing both input saturation and mismatched disturbance. Firstly, to estimate the mismatched disturbance of the system accurately, the finite time convergence super-twisted disturbance observer is designed. Secondly, a new sliding mode surface is designed based on the estimated value of the mismatched disturbance. Furthermore, under the condition of considering the input saturation constraint, adaptive sliding mode control law is presented to ensure that the system can handle input saturation and mismatched disturbance effectively. Finally, the effectiveness of the method is verified by simulation.