空间飞行器姿态控制律设计

空间飞行器姿态系统具有非线性、强耦合、多输入多输出的特点。针对飞行器姿态模型的非线性和不确定性，提出了分散模糊变结构控制方法。利用模糊系统对不确定性函数进行逼近，将获得的模糊系统函数作为系统不确定性界函数。对模糊逼近所带来的误差以及外部干扰项，采用控制补偿方法。理论分析和仿真研究表明，提出的方法具有控制精度高，实时计算量小，便于工程实现等优点。

Control law design for space vehicle attitude system

The space vehicle attitude system is a nonlinear, strongly coupled system with multi - input and multi - output. Based on the nonlinear and uncertain model of the spacecraft attitude system, a fuzzy variable structure control method is proposed. The fuzzy system is used to approximate the system uncertain function, and the fuzzy system function obtained is taken as system uncertainty boundary function. Furthermore, the er- ror resulted from fuzzy approximation and the external disturbances are compensated so that the influence on the system is minimized. Theoretical analysis and simulation results showed that the proposed method has high control accuracy, low real - time computation and is easy for engineering realization.