摘要
为了提高遥感成像系统分辨率并降低大孔径光学系统的加工难度,拼接式合成孔径技术被应用于遥感领域。但是在拼接过程中,由于子镜失调会导致相位误差,致使光学系统成像分辨率下降,提出采用位相差相位恢复方法估计子镜失调引起的相位误差,并用于反求子镜失调,为在轨装调提供依据,最终达到改善系统成像性能的目的。将已知离焦位相情况下的模型输出与实际成像输出之间的差异作为失调相位估计的目标函数,建立了存在失调的拼接孔径系统成像的数学模型。通过对几种求解非线性方程最优解方法的比较,采用BFGS法来寻找位相最优估计值。仿真实验表明:提出的算法能将光学系统的相位恢复误差控制在6%范围内。
The segmented aperture optical system is widely used in the field of remote sensing for its advantages in reducing the manufacturing complexity to achieve high imaging resolution.However,the misalignments among these segments may result in phase errors,and degrade the imaging resolution of optical system.Phase diversity phase retrieval is adopted to resolve this issue,which solves the misalignment of segmented mirrors inversely and provides the basis for aligning on-orbit.The misaligned optical system mathematical model for segmented primary mirror is set up,and the difference between the model output and actual output at the known defocus is regarded as the target function of misaligned phase estimation.After being compared with other methods of resolving nonlinear equation,BFGS method is used to seek the optimum phase value.The result of the simulation experiment indicates that the method of phase diversity phase retrieval can control the phase error below 6%.
出处
《应用光学》
CAS
CSCD
北大核心
2010年第5期685-689,共5页
Journal of Applied Optics
关键词
应用光学
拼接孔径
在轨失调
位相差
相位恢复
applied optics
segmented aperture
misalignment on-orbit
phase diversity
phase retrieval
