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研究地球静止轨道航天器两自由度扫描镜成像位置误差补偿问题,即通过对扫描角的补偿,使光轴在地球表面的成像点位置与标称位置相同,消除探测区域的位置偏差.在考虑扫描镜法线偏移、姿态偏差以及轨道误差条件下,推导了光轴成像点的地心经纬度计算公式.给出了上述3类误差的具体描述方式,并分析了各种误差对光轴成像点位置的影响关系.基于角度误差的小量假设条件,给出了扫描镜的步进角/扫描角补偿量的显式算法.针对法线偏移信息一般难以准确测量的问题,提出了一种利用扫描镜在特定工作模式下的光轴惯性空间定向能力和法线偏移的长周期特性对其进行估计的方法.仿真结果表明,所提出的补偿方案和算法能够显著提高成像点位置精度.
To study the problem of compensating the position error of the two-DOF scanning mirror of the geostationary spacecraft, that is, to compensate the position of the imaging point of the optical axis on the Earth’s surface by the compensation of the scanning angle, the position deviation of the detection area is eliminated. Scanning normal deflection, attitude deviation and orbit error, the geocentric geocentric latitude and longitude calculation formula of optical axis imaging point is deduced.The concrete description methods of the above three kinds of errors are given, and the errors of the optical axis imaging Point position.According to the assumption of small amount of angle error, an explicit algorithm of the step angle / scan angle compensation of scanning mirror is given.Aiming at the problem that the normal line offset information is generally difficult to be accurately measured, A method of estimating the long-period characteristics of the optical axis inertial space orientation function and the normal line offset of a scanning mirror in a specific working mode is given. The simulation results show that the proposed compensation scheme and algorithm can significantly improve the position accuracy of the imaging point .