重力梯度卫星大角度姿态机动的变结构控制

SLIDING MODE CONTROL FOR LARGE ANGLE MANEUVERS OF GRAVITY GRADIENT STABILIZED SATELLITE

针对重力梯度稳定小卫星的大角度姿态机动问题,采用四元数来描述卫星的姿态,通过选择一类滑动流形,设计了变结构控制律,得到了在大角度姿态机动中卫星的姿态角、姿态角速度以及三个反作用飞轮转速的变化规律.理论分析和数值仿真都表明了该控制律具有渐近稳定性和鲁棒性.

The large angle attitude maneuvers control by using reaction wheels for gravity gradient stabilized small satellites is stutied.By introducting quaternion to describe the satellite attitude,a sliding mode is selected and the control law is developed.The histories of the satellite attitude and the angular rates of the reaction wheels during the process of the large angle attitude maneuver are obtained.Both theoretical analysis and simulation show that the variable structure control law is asymptotically stable and robust.