高分五号多角度偏振探测仪可见光波段在轨辐射定标研究  

In-Flight Radiation Calibration of a Directional Polarimetric Camera at Visible Bands Onboard GF-5

作　　者：陈斐楠 樊依哲 洪津[1,3] 黄禅 李双[1,3] 杨本永[1,3] 涂碧海 韩琳 孙斌 Chen Feinan;Fan Yizhe;Hong Jin;Huang Chan;Li Shuang;Yang Benyong;Tu Bihai;Han Lin;Sun Bin(Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences.Hefei,Anhui 230031,China;University of Science and Technology of China,Hefei,Anhui 230031,China;Kei/Laboratori/of Optical Calibration and Characterization,Chinese Academy of Sciences,Hefei,Anhui 230031,China)

机构地区：[1]中国科学院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学技术大学,安徽合肥230031 [3]中国科学院通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光学学报》2020年第23期198-208,共11页Acta Optica Sinica

基　　金：卢嘉锡国际合作团队项目(GJTD-2018-15);国家自然科学基金(11504383)。

摘　　要：对于无星上定标系统的大视场大气探测载荷,利用广阔的海洋无监测定标场(SNES)进行基于统计方法的在轨替代定标,是国际上公认和推荐的方法。基于大气气溶胶多角度偏振探测仪(DPC)的载荷工作原理和一级数据产品的特点,在确定反射率基定标的基础上,通过海表双向反射率分布函数(BRDF)的大气传输仿真计算确定了合适的角度阈值,以降低非大气分子散射的干扰;同时对定标场的环境参量进行了统计分析,解决了统计定标中数据筛选与误差评估的核心问题,最终实现了DPC可见光波段在轨定标系数变化的精确评估。在考虑定标源和仪器实验室定标误差合成后,绝对辐射定标系数的最终定标误差在1.24%~4.76%之间。The in-flight calibration of large-field atmosphere sensors without the onboard calibration system using broad sea-non equipped sites(SNES) is a recommended method. Herein, based on the working principle of the Directional Polarimetric Camera(DPC) and the characteristics of its level-1 data products and the reflection base method, the simulation of sea surface bidirectional reflectance distribution function(BRDF) transfer to the top of the atmosphere is processed to determine the appropriate threshold angle to reduce nonatmospheric molecular scattering interference. At the same time, the statistical analysis of the calibration sites’ environmental parameters is analyzed to solve the data selection and incorrect budget problems. Finally, the accurate evaluation of the in-flight calibration coefficient changes of DPC at visible bands is achieved. The final calibration error of the absolute radiation calibration coefficient is between 1.24% and 4.76% subsequent to considering the calibration source and instrument laboratory calibration error synthesis.

关 键 词：遥感 瑞利散射 大气辐射传输 在轨定标 误差合成 

分 类 号：O433.1[机械工程—光学工程]