临近空间高超声速飞行器匹配化滑模姿态控制

针对临近空间高超声速飞行器非匹配不确定性姿态控制问题,提出一种新型匹配化滑模姿态控制系统设计方法。首先将含有非匹配不确定性的模型进行匹配化变换,得到匹配的不确定性模型。采用扩张干扰观测器估计不确定项,用来补偿系统输出量的微分。其次,基于干扰观测器及频域滤波器设计了一种渐近收敛的复合微分器,用来获取系统输出的一阶导数。在此基础上,采用变结构控制方法,提出了一种匹配化滑模姿态控制方法。最后,通过数字仿真验证了该方法的有效性,并与反步法进行了对比,对比结果表明本文的方法具有更好的快速性及鲁棒性。

Matched sliding mode attitude control of near-space hypersonic vehicle

A novel matched sliding mode attitude control method is proposed for near-space hypersonic vehicle with mismatched uncertainties. Firstly, a model with matched uncertainties is derived from matching transformation, and the derivative of system output is compensated by the estimated uncertainties from an extended disturbance observer. Secondly, a compound derivator with asymptotic stability is designed based on the disturbance observer and the frequency domain filter to obtain the derivative of system output. A novel matched sliding mode attitude control method is proposed based on variable structure control theory. Finally, the performances are assessed through a numerical simulation, and the proposed attitude control system has faster tracking performance and better robustness compared with the backstepping control system.