小卫星姿态反作用轮捕获的预测控制方法

Predictive control approach of small satellite attitude capture under reaction wheels

有利于提高小卫星的功能密度．为在反作用轮速率饱和限制条件下获得较短的捕获时间，在极大值原理和非线性预测控制理论基础上提出了分步优化的思想，设计了用于姿态捕获的次最优控制器，避免了直接代化控制的困难．最后进行了仿真验证，结果表明该控制方法能在反作用轮速率饱和限制条件下较快地实现小卫星姿态捕获，且具有良好的鲁棒性．

Reaction wheels usually stabilizing satellite attitude are used as executor of attitude capture, which helps to improve the function density of small satellite. To access short capture time with the limit of reaction wheels' rate saturation , a stepwise optimal method based on ch theory and nonlinear predictive control theory is put forward. According to this an approximate optimal controller is designed Which overeomes the difficulty of direct optimizing . Then simulation is used to prove that this control method is effective and robust.