基于模糊变结构的空间飞行器姿态控制

Spacecraft Attitude Control Based on Fuzzy Variable Structure

根据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,对飞行器姿态模型的非线性和不确定性,提出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,提出的控制方法具有姿态跟踪精度高,实时计算量小,便于工程实现等优点。

The spacecraft attitude system is a nonlinear and strongly coupled system with multi-input and multi output. Basing 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. Furthermore, the errors from fuzzy approximation and external disturbances are compensated so that the influence on the system is minimized. Theoretical analysis and simulation results show that the proposed control method has high tracking accuracy and low computation load and is easy for application.