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为研究大气湍流对空间目标偏振成像探测准确度的影响,构建了大气湍流影响下的偏振成像探测模型,并对大气湍流导致的空间目标偏振度探测偏差进行仿真分析.通过对分时和同时偏振成像方式进行仿真,发现大气湍流会对空间目标偏振成像探测准确度造成明显影响,且对分时偏振成像探测准确度的影响明显大于同时偏振成像方式.通过自适应系统校正部分低阶像差,能明显减小大气湍流对偏振成像探测准确度的影响.为了兼顾图像信噪比和大气湍流影响下的偏振成像探测准确度,给出了一种结合分时和同时成像方式的改进偏振成像探测方式,大气湍流对其的影响略大于同时偏振成像方式,但该方式图像信噪比明显优于同时偏振成像方法.另外仿真分析发现,采用多帧图像叠加能效减小大气湍流带来的空间目标偏振成像探测偏差,在使用分时偏振成像方式时效果尤为明显.
In order to study the influence of atmospheric turbulence on the detection accuracy of space target polarization imaging, a polarization imaging detection model under the influence of atmospheric turbulence is constructed, and the spatial target polarization degree detection deviation caused by atmospheric turbulence is simulated.Through the analysis of time-sharing and simultaneous polarization The simulation results show that the atmospheric turbulence has a significant impact on the detection accuracy of space-borne target polarization imaging, and the impact on the detection accuracy of the time-sharing polarization imaging is significantly greater than that of the simultaneous polarization imaging. By adaptive partial low-order aberrations, Can significantly reduce the impact of atmospheric turbulence on the detection accuracy of polarized imaging.In order to take into account the image signal to noise ratio and atmospheric turbulence under the influence of the polarization imaging detection accuracy, combined with a time-sharing and simultaneous imaging improved polarization imaging detection Mode, the effect of atmospheric turbulence is slightly greater than that of simultaneous polarimetric imaging, but the signal to noise ratio of this method is obviously better than the method of simultaneous polarimetric imaging.Furthermore, the simulation analysis shows that the multi-frame image stacking can reduce the spatial target caused by atmospheric turbulence Polarization imaging detection bias, the use of time-sharing polarization imaging effect especially Obviously.