高分五号02星多角度偏振成像仪在轨辐射性能初步评价  

Preliminary evaluation of in-flight radiation performance of directional polarimetric camera of Gaofen-5(02)satellite

作　　者：朱思峰 朱梦瑶 伽丽丽 许华 李正强 谢一凇 洪津[5] 涂碧海[5] 孟炳寰 ZHU Sifeng;ZHU Mengyao;QIE Lili;XU Hua;LI Zhengqiang;XIE Yisong;HONG Jin;TU Bihai;MENG Binghuan(State Environmental Protection Key Laboratory of Satellite Remote Sensing,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Institute of Satellite Engineering,Shanghai 201109,China;College of Geoexploration Science and Technology,Jilin University,Changchun 130026,China;Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学院空天信息创新研究院,国家环境保护卫星遥感重点实验室,北京100101 [2]中国科学院大学,北京100049 [3]上海卫星工程研究所,上海201109 [4]吉林大学地球探测科学与技术学院,吉林长春130026 [5]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031

出　　处：《大气与环境光学学报》2023年第4期310-322,共13页Journal of Atmospheric and Environmental Optics

基　　金：国家自然科学基金(42175148);国家杰出青年科学基金(41925019)。

摘　　要：2021年9月我国成功发射的高分五号02星[GF-5(02)]上搭载有多角度偏振成像仪(DPC)和高精度偏振扫描仪(POSP),组成了“偏振交火”观测方案。为评价GF-5(02)卫星DPC传感器的在轨辐射性能,基于2022年1月DPC和POSP观测数据,采用海洋瑞利散射和“偏振交火”交叉定标两种方法,实现了DPC在轨绝对辐射定标和视场内相对辐射一致性检验。结果表明,DPC/GF-5(02)在轨后的绝对辐射和相对辐射响应较发射前的实验室定标结果均未发生明显改变,在轨前后各波段绝对辐射系数差异均小于5.3%,视场内相对辐射响应变化均小于2%。其中,443nm波段瑞利散射和“偏振交火”交叉两种方法获得的绝对辐射定标系数一致性较高,偏差约为2%;而490nm和670nm波段两方法定标结果偏差较大,偏差分别为7.4%和7.7%。整体上,DPC/GF-5(02)在轨后的辐射稳定性优于DPC/GF-5。In September 2021,China successfully launched the Gaofeng-5(02)satellite(GF-5(02)),which is equipped with a directional polarimetric camera(DPC)and a high-precision particulate observing scanning polarimeter(POSP),forming a"polarization crossfire"observation program.In order to evaluate the in-flight radiation performance of the DPC sensor loaded on GF-5(02)satellite,based on the DPC and POSP observation data in January 2022,two methods,ocean Rayleigh scattering and"polarization crossfire"cross-calibration between DPC and POSP,were used to achieve the absolute calibration in-flight and the relative radiometric consistency test in the field of view of DPC.The results show that compared with the laboratory calibration results before launch,the absolute radiometric and relative radiometric response of DPC/GF-5(02)after launch have not changed significantly,the absolute calibration coefficient of each band changes less than 5.3%after launch,and the change of relative radiometric response in the field of view is less than 2%.Specifically,the absolute calibration coefficients obtained by the two methods of Rayleigh scattering and cross calibration(DPC and POSP)at 443 nm band have a high consistency,with a deviation of about 2%,while the calibration results of the two methods at 490 nm and 670 nm bands have a large deviation,with a deviation of 7.4%and 7.7%,respectively.Overall,the radiation stability of DPC/GF-5(02)after orbit is better than that of DPC/GF-5.

关 键 词：高分五号02星 多角度偏振成像仪 绝对辐射系数 相对辐射系数 瑞利散射定标 “偏振交火”定标 

分 类 号：TP931[自动化与计算机技术]