基于增益分配的航天器高精度指向跟踪控制

A High Precision Attitude Pointing Tracking Control for Spacecraft Based on the Gain Schedule

研究刚体卫星的高精度大角度指向跟踪控制问题。为保证姿态描述的全局性,由修正Rodrigues参数描述相对姿态。设计PD型姿态指向跟踪控制器,可同时实现角度跟踪和角速度跟踪。为提高控制精度,同时避免控制输出进入饱和域,本文在控制器的基础上设计了增益分配律。通过数值仿真,在存在初始指向偏差和输出饱和约束条件下,控制器可实现大椭圆轨道卫星对静止轨道卫星的高精度姿态指向跟踪。当转动惯量存在常值误差时,控制器仍然适用。

It is investigated that the high precision and large angle of attitude pointing tracking control problem for rigid spacecraft in this paper. For ensuring the representation of attitude is globally defined, we use the modified Rodrigues parameters to represent the relative attitude. A kind of PD type attitude pointing tracking controller is developed, which can guarantee the relative attitude and relative angular velocity be asymptotically stable. Furthermore, a kind of gain schedule is designed to improve the accuracy of control and avoid the saturation limits. Numerical simulation results that the control algorithm is able to keep the high eccentric obit satellite pointing tracking the geostationary satellite under the situation of existing initial pointing error and the saturation limits. The control algorithm performs robustness, during changing of sat- ellite inertia matrix.