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多角度偏振成像仪偏振通道响应非一致性测量方法

Method for Measuring Response Non-Uniformity of Polarization Channels in Directional Polarization Camera

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摘要

GF-5卫星多角度偏振成像仪(DPC)同一波段三个偏振通道(0°、60°及120°)必须进行响应非一致性校正,才能达到偏振探测的精度要求。将范围为-50°~50°的DPC宽视场划分为15×15个分视场,使用高精度的二维转动平台调整各分视场的位置以对准积分球参考光源进行成像。设计基于时间稳定性的分视场图像数据的拼接算法,得到全视场的拼接图像,并应用对数增强方法检测拼接图像中坏像元的位置与数量。采用拼接图像计算DPC同一波段三偏振通道的相对透过率、低频相对透过率及高频相对透过率,为DPC偏振通道响应非一致性校正提供了校正系数。结果表明,DPC偏振通道的响应非一致性测量不确定度优于0.67%。所提方法为校正DPC偏振通道间的响应非一致性、提高偏振信息的解析精度提供了高精度的手段。

Abstract

Only calibrating the response non-uniformity among three polarization channels of 0°, 60°, and 120° in the same waveband of a GF-5 satellite directional polarization camera (DPC) can make the accuracy requirement of polarization detection met. The wide field-of-view with DPC range of -50°--50° is divided into 15×15 sectional field-of-view and a high-accuracy two-dimensional turntable is used to adjust the position of each sectional field-of-view for aiming the integrating sphere reference light for imaging. The mosaic algorithm of the sectional field-of-view image data based on time stability is designed to obtain the mosaic images of the entire field-of-view. Furthermore, the logarithm enhancement method is used to detect the location and number of bad pixels in the mosaic images. The mosaic images are used to calculate the relative transmittance, low frequency relative transmittance, and high frequency relative transmittance of three polarization channels in the same waveband of DPC, and a calibration factor is provided for the calibration of DPC polarization channel response non-uniformity. The results show that the measurement uncertainty of DPC polarization channel response non-uniformity is superior to 0.67%. The proposed method provides a high-precision tool for calibrating the response non-uniformity among DPC polarization channels and for improving the analytical accuracy of polarization information.

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中图分类号:TP79

DOI:10.3788/AOS202040.0828001

所属栏目:遥感与传感器

基金项目:国家自然科学基金;

收稿日期:2019-11-25

修改稿日期:2019-12-31

网络出版日期:2020-04-01

作者单位    点击查看

翁建文:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026
袁银麟:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
郑小兵:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
康晴:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
涂碧海:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026
夏茂鹏:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
洪津:中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031

联系人作者:袁银麟(ylyuan@aiofm.ac.cn)

备注:国家自然科学基金;

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引用该论文

Weng Jianwen,Yuan Yinlin,Zheng Xiaobing,Kang Qing,Tu Bihai,Xia Maopeng,Hong Jin. Method for Measuring Response Non-Uniformity of Polarization Channels in Directional Polarization Camera[J]. Acta Optica Sinica, 2020, 40(8): 0828001

翁建文,袁银麟,郑小兵,康晴,涂碧海,夏茂鹏,洪津. 多角度偏振成像仪偏振通道响应非一致性测量方法[J]. 光学学报, 2020, 40(8): 0828001

被引情况

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【2】崔文煜,黄文娟,易维宁. 分束型同时偏振成像系统定标及预处理方法. 光学学报, 2020, 40(20): 2011002--1

【3】李朕阳,刘振海,邹鹏,朱双双,雷雪枫,陶菲,提汝芳,宋茂新,洪津. 星载偏振扫描仪发射前定标及地面验证实验. 光学学报, 2021, 41(3): 312002--1

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