Institutional Repository of Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China
Polarization measurement accuracy analysis and improvement methods for the directional polarimetric camera | |
Huang Chan1,2,3; Xiang Guangfeng1,2,3; Chang Yuyang1,2,3; Han Lin1,3; Zhang Miaomiao4; Li Shuang1,3![]() ![]() ![]() ![]() | |
2020-04 | |
发表期刊 | Optics Express
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ISSN | Vol. 28, No. 9 / 27 April 2020 / Optics Express 13187 |
摘要 | The directional polarimetric camera (DPC), developed by Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, is a satellite sensor used to observe the polarization and directionality of the earth’s reflectance. It acquires the two-dimensional image of the earth with a large field of view (118.74°) and a high spatial resolution (3.3 km) in 8 spectral bands. The first DPC was successfully launched onboard the GaoFen-5 satellite in May 2018, subject to the Chinese high-resolution earth observation program. In this paper, a set of systematic and complete pre-flight calibrations of the DPC are proposed to ensure the effective characterization for in-flight calibration, so as to ensure the accuracy of DPC measured radiation polarization data and the reliability of inversion results. Since the geometric calibration method of the DPC has been presented in an early companion paper [Appl. Opt. 59 226 (2020)], this paper will not introduce it in detail. Instead, the geometric calibration results of each spectral band together with a discussion on the origin of differences between spectral bands are analyzed, and the error analysis of the method is conducted. The results of the DPC geometric calibration is that the residuals of all spectral bands are less than 0.1 pixel. For radiometric calibration, the radiometric models of non-polarized bands and polarized bands are derived in detail, respectively, and the specific calibration methods with error analysis, equipment, and main results with their related accuracies for each parameter of the radiometric models are described. To verify the accuracy of calibration parameters, a series of polarization detection accuracy verification experiments based on a non-polarized radiation source, a polarizing system, and a natural scene were carried out. The experimental results show that the maximum deviation of degree of polarization between the set values of the polarizing system and measured values of the DPC at the corresponding positions of four field of view angles of 0, 15, 30, and 45 degrees of each polarized spectral band is 0.009, 0.004, and 0.003, respectively. The average error in measuring the degree of polarization of a non-polarized light source by all pixels in the three polarized bands is 0.0043, 0.0046, and 0.0037, respectively. And the relative deviations of each field of view are within 0.020 when the DPC and CE318N simultaneously measure the DoLP of sky. All of these prove the effectiveness of the pre-flight calibration. |
学科领域 | 光学 ; 大气科学 |
学科门类 | 理学::物理学 ; 理学::大气科学 ; 理学::地球物理学 ; 工学::光学工程 ; 工学::航空宇航科学与技术 ; 工学::环境科学与工程(可授工学、理学、农学学位) |
DOI | 10.1364/OE.391078 |
关键词[WOS] | DPC ; Pre-flight calibration ; geometric calibration ; radiometric calibration ; polarization calibration ; degree of polarization |
收录类别 | SCI |
语种 | 英语 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.hfcas.ac.cn:8080/handle/334002/132325 |
专题 | 中科院安徽光学精密机械研究所 |
通讯作者 | Meng Binghuan |
作者单位 | 1.Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China, 2.University of Science and Technology of China, Hefei, Anhui 230026, China 3.Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China 4.Shanghai Institute of Satellite Engineering, Shanghai 200240, China |
第一作者单位 | 中科院安徽光学精密机械研究所 |
通讯作者单位 | 中科院安徽光学精密机械研究所 |
推荐引用方式 GB/T 7714 | Huang Chan,Xiang Guangfeng,Chang Yuyang,et al. Polarization measurement accuracy analysis and improvement methods for the directional polarimetric camera[J]. Optics Express,2020. |
APA | Huang Chan.,Xiang Guangfeng.,Chang Yuyang.,Han Lin.,Zhang Miaomiao.,...&Hong Jin.(2020).Polarization measurement accuracy analysis and improvement methods for the directional polarimetric camera.Optics Express. |
MLA | Huang Chan,et al."Polarization measurement accuracy analysis and improvement methods for the directional polarimetric camera".Optics Express (2020). |
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