纯磁控微小卫星姿态控制研究

Attitude Control of Micro-Satellite With Only Magnetic Actuators

针对微小卫星速率阻尼、姿态捕获及三轴稳定的不同姿态控制模式,设计了采用纯磁控的控制律.首先以轨道坐标系为参考建立卫星模型,然后在卫星能量分析和Lyapunov稳定方法基础上,应用B-dot控制进行速率阻尼,给出了全局稳定能量控制来进行姿态捕获和三轴稳定控制的新方法,同时根据线性化的卫星模型,设计了常系数LQG控制律.仿真结果表明,B-dot可以有效地进行速率阻尼,能量控制策略适用于大角度姿态捕获和三轴稳定,稳定控制时LQG与能量控制相比具有更高的精度,但稳定度略差.

This paper researched on the attitude control of Micro-satellite using only magnetic torque for the different control modes including detumbling and attitude acquisition as well as threeaxis stabilization. The satellite model was established relative to orbit frame firstly, then based on the energy considerations and Lyapunov stability analysis methods, the B-dot controller for detumbling was presented, moreover, a new method using global energy control for attitude acquisition and three-axis attitude stabilization was given. At the same time based on the Linearizatlon of the satellite model, a constant gain LQG-controller was designed. Simulating result indicated that the B-dot controller can detumble the satellite＇s rate effectively; the global energy controller may be used in the large range of attitude capture and stabilization modes; while in small angle range the LQG controller has high precision but the stability properties is not so good compared to the energy controller.