空间站姿态/动量联合非线性控制

从Lyapunov稳定性理论出发,设计了一个非线性控制器,实现了空间站姿态和控制力矩陀螺角动量的联合控制。在此基础上,为抑制周期性环境干扰力矩对姿态控制性能的影响,引入了周期性扰动抑制滤波器,对非线性姿态/动量控制器进行了改进。改进的控制器不但可以抑制空间站姿态的周期性波动,而且可在满足特定飞行任务的前提下,建立空间站指向和控制力矩陀螺动量管理间的折中。控制器参数物理意义明确,易于调整。对空间站姿态控制/动量管理系统的仿真结果表明,该控制器是可行的。

Nonlinear Control of Attitude and Momentum for Space Station

Since space station is a nonlinear system in essence,it is difficult to realize the high-performance atti- tude control and momentum management using ordinary linear control strategies.In this paper,a nonlinear at- titude/momentum controller is designed according to the nonlinear dynamics of space station.However,the periodic fluctuations still exist in the attitude and attitude rate due to the cyclic disturbances,such as the aero- dynamic torque.Therefore,an improved nonlinear controller is presented for the extended attitude control/ momentum management system after a cyclic-disturbance rejection filter is introduced.Using this controller, the attitude fluctuations can be restrained to great extent.Furthermore,this controller can establish a proper tradeoff between station pointing and momentum management of control moment gyroscopes,while satisfying the specific mission requirements.Controller parameters are easy to regulate since they have definite physical meanings.Simulation results of a certain space station indicate that the controller presented above is feasible.