【摘要】 文章针对三轴稳定卫星受周期干扰影响的情形,研究周期干扰力矩预先未知的情况下卫星在稳态运行期间姿态的高精度控制问题。要实现卫星姿态的高精度控制,需要对未知周期干扰力矩进行在轨估计进而实现补偿。该文首先基于卫星的稳态输出数据,采用特征系统实现法辨识周期干扰力矩的频率,并结合控制系统的闭环传递函数估计干扰的幅值进而获得周期干扰的完整模型。然后提出了使用前馈控制对所估计干扰实现在线补偿的方案。分析和仿真结果表明,上述方案能有效地克服未知周期干扰力矩对姿态稳定度的影响,提高在轨运行卫星的姿态控制精度。更多还原

【Abstract】 Aim.Pinpointing the difficulty to be that the periodically disturbing torques are usually unknown in both frequency and amplitude,we devise a new method for identifying and then compensating for them.Section 1 of the full paper establishes the complete models of the periodically disturbing torques;essentially,it,using the output data of the steady-state satellite,eigenvalues and eigenfunctions,derives eq.(13) to estimate frequency and eq.(26) to estimate amplitude.Utilizing the mathematical derivation in section 1,section 2 gives eq.(27) for implementing a feedforward compensation algorithm to keep the on-orbit satellite in steady state despite periodically disturbing torques.Simulation results,given in Figs.1 and 2,show preliminarily that the new method devised by us is indeed successful in keeping the on-orbit satellite in steady state despite periodically disturbing torques;therefore,in our opinion, our new method is valid in high precision attitude control.更多还原