卫星活动部件的干扰辨识与抑制

采用干扰辨识的方法实现带活动部件三轴稳定卫星的高精度姿态控制问题.首先以扫描镜为例进行,分析扫描镜运动对卫星产生的等效干扰力矩;然后根据卫星控制系统的稳态输出数据,采用特征系统实现算法对扫描运动产生的干扰频率进行闭环辨识;最后在所辨识干扰频率的基础上,采用偶极子干扰抑制滤波器消除扫描镜运动干扰对卫星姿态的影响.仿真结果表明,所提出的方法能有效地克服活动部件运动产生的未知干扰对卫星姿态稳定度的影响,提高在轨运行卫星的姿态控制精度.

Research on Disturbance Identification and Rejection of Satellite with Moving Payloads

In this paper, precise attitude control of the three-axis stabilized satellite with moving payloads was studied from a disturbance identification perspective The equivalent disturbance torques caused by moving payload such as the scan mirror was analyzed Based on the steady output-only, the eigensystem realization algorithm(ERA) was employed to identify the disturbance frequencies caused by scan mirror Finally we used the dipole disturbance rejection filter to achieve on-line rejection of the identified disturbance Simulation results shows that the approach proposed in this paper can reject the unknown and unwanted disturbance caused by moving payloads effectively, and improve the control performance of satellite for steady-state operation.