王国聪, 常伟军, 胡博. 低轨空间目标地基偏振成像系统偏振定标方法[J]. 应用光学, 2017, 38(6): 896-902. DOI: 10.5768/JAO201738.0601007
引用本文: 王国聪, 常伟军, 胡博. 低轨空间目标地基偏振成像系统偏振定标方法[J]. 应用光学, 2017, 38(6): 896-902. DOI: 10.5768/JAO201738.0601007
Wang Guocong, Chang Weijun, Hu Bo. Polarization calibration method of ground-based polarization imaging system for low earth orbit space objects[J]. Journal of Applied Optics, 2017, 38(6): 896-902. DOI: 10.5768/JAO201738.0601007
Citation: Wang Guocong, Chang Weijun, Hu Bo. Polarization calibration method of ground-based polarization imaging system for low earth orbit space objects[J]. Journal of Applied Optics, 2017, 38(6): 896-902. DOI: 10.5768/JAO201738.0601007

低轨空间目标地基偏振成像系统偏振定标方法

Polarization calibration method of ground-based polarization imaging system for low earth orbit space objects

  • 摘要: 针对地基大口径望远镜的机上自适应光学系统构建的低轨空间目标偏振成像系统,提出一种基于非偏振标准星和机上起偏装置的宽带偏振定标方法。该方法以非偏振标准星作为光源,并在望远镜系统的一次像面处加入起偏装置对入射光的偏振态进行调制,再结合基于非线性最小二乘拟合的偏振定标方法分两步对整个偏振成像系统进行宽带偏振定标。为验证该偏振定标方法的效果,利用Matlab软件基于相干矩阵和偏振追迹构建了相应的模型进行仿真分析,仿真结果表明该偏振定标方法可以有效减小望远镜系统偏振效应对偏振探测准确性的影响,并且偏振定标元件的初始角度误差在±5°范围内时对偏振定标准确性的影响极小。

     

    Abstract: For the polarization imaging system which was constructed in the adaptive optics system of ground-based telescope and imaged for low earth orbit space objects, a broadband polarization calibration method based on unpolarized standard star and onboard polarization state generator was proposed. This method, which contained two steps for polarization calibration based on nonlinear least-square fitting polarization calibration method, used the unpolarized standard stars as the light source and utilized the polarization state generator inserted in the first image plane of telescope system to modulate the polarization state of incident light. Then to verify the performance of this polarization calibration method, a simulation model based on coherent matrices and polarization ray tracing was constructed and corresponding simulation was carried out by Matlab. The simulation results show that this polarization calibration method can effectively decrease the influence of telescope polarization on the accuracy of polarization detection. And under the influence of random initial angle errors of polarization calibration elements within ±5°, the performance of this polarization calibration method can be affected tinily.

     

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