大气湍流对空间目标偏振成像探测的影响  

Influence on Space Target Polarization Imaging Detection Resulting from Atmospheric Turbulence

作　　者：王国聪[1,2] 王建立[1] 张振铎[1] 于树海[1] 曾蔚[3] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院大学,北京100049 [3]山东大学信息科学与工程学院,济南250001

出　　处：《光子学报》2016年第4期131-137,共7页Acta Photonica Sinica

基　　金：国家高技术研究发展计划(No.2014AAXXXX072D)资助~~

摘　　要：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 impact of atmospheric turbulence on the imaging polarization detection of space targets,this paper constructed a simulation analysis model and focused on analyzing detection deviations of degree of linear polarization caused by the atmospheric turbulence.By simulating the timesharing and simultaneous polarization imaging method,it is found that atmospheric turbulence has obvious influence on the imaging polarimetric measurement accuracy,which impacts the time-sharing imaging polarization method more obviously.And the impact resulting from atmospheric turbulence can be significantly reduced by using the adaptive system to correct partial low order aberrations.For balancing the imaging signal-to-noise ratio and the measurement accuracy of the imaging polarimetry,an improved polarization imaging method which combining with time-sharing and simultaneous imaging method was proposed.The influence of atmospheric turbulence on this method is larger than the simultaneous method slightly.But the proposed method can achieve a better imaging signal-to-noise ratio.Then from simulating and analyzing,it is found that multi-frame images combination method can reduce the deviations of polarimetric measurements under influence of atmospheric turbulence effectively,especially for time-sharing polarization imaging method.

关 键 词：偏振 大气湍流 空间目标 望远镜 探测与识别 

分 类 号：O436.3[机械工程—光学工程]