航天器两自由度扫描镜图像运动补偿技术研究

研究航天器的两自由度扫描镜图像运动补偿问题。在姿态估计信息的基础上,给出了一种运动补偿算法。算法中不仅补偿了姿态估计信息,还同时考虑了姿态信息中的长周期系统误差。利用扫描镜在特定工作模式下相对惯性空间的准确定向能力和系统误差的长周期特性,给出了一种系统误差的估计和补偿算法,每隔一定的时间段对系统误差估计值进行更新并加以补偿,进一步提高了扫描精度。基于一颗地球静止轨道卫星的数值仿真结果验证了补偿算法的有效性。

Image Motion Compensation for a Two-degree Scan Mirror of a Spacecraft

The problem of image motion compensation for a two-degree scan mirror of a spacecraft is investigated.Based on the attitude estimate information,an image motion compensation algorithm is presented.The algorithm not only compensates the attitude estimate information,but also considers the long-period system error of the attitude information.An algorithm for system estimation and compensation is presented based on the ability of accurate orientation determination of the scan mirror in special operation mode,and the long-period character of the system error.The estimated value of the system error is replaced and compensated at given time interval,so that the scan precision is improved further.Numerical simulation results based on an earth stationary orbit satellite demonstrates the effectiveness of the compensation algorithm.