基于图像特征匹配的空间望远镜在轨像差补偿方法

• Format: Patent
• Language: Chinese
• Published: 15.03.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

基于图像特征匹配的空间望远镜在轨像差补偿方法，属于空间望远镜在轨调校领域，包括：利用矢量像差理论，建立次镜、调焦镜各位姿自由度失调量与任意视场位置处的波像差改变量之间的映射关系；利用傅里叶光学理论，进一步建立次镜、调焦镜各位姿自由度失调量与任意视场位置处的恒星点斑离焦图像灰度信息之间的映射关系；利用低阶切比雪夫矩提取实际采集的多个恒星点斑离焦图像特征，计算出多个恒星点斑离焦图像的特征向量；建立目标函数、优化求解补偿量。本发明通过利用空间大口径天文望远镜主成像区域多个不同视场的恒星点斑图像对补偿全视场像差所需的次镜、调焦镜的调整量进行计算，实现对空间大口径天文望远镜在轨像差的补偿。 A space telescope on-orbit aberration compensation method based on image feature matching belongs to the field of space telescope on-orbit adjustment and comprises the following steps: establishing a mapping relation between the degree-of-freedom misalignment of each pose of a secondary mirror and a focusing mirror and the wave aberration variation at any view field position by using a vector aberration theory; further establishing a mapping relation between the degree of freedom misalignment of each pose of the secondary mirror and the focusing mirror and the gray scale information of the fixed star spot defocus image at any view field position by using the Fourier optics theory; extracting features of a plurality of ac