高光谱观测卫星偏振交火工程设计及在轨性能评估  

Engineering design and in-orbit performance evaluation of polarization crossfire suite onboard the hyperspectral observation satellite

作　　者：张苗苗 温渊[1] 朱思峰 谢艳清 李迎杰 李云端[1] 洪津[2] 刘振海 骆冬根 宋茂新 王羿 ZHANG Miaomiao;WEN Yuan;ZHU Sifeng;XIE Yanqing;LI Yingjie;LI Yunduan;HONG Jin;LIU Zhenhai;LUO Donggen;SONG Maoxin;WANG Yi(Shanghai Institute of Satellite Engineering,Shanghai 201109,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]上海卫星工程研究所,上海201109 [2]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295-309,共15页Journal of Atmospheric and Environmental Optics

基　　金：国家自然科学基金(42275144)。

摘　　要：2021年9月7日发射的高光谱观测卫星是《国家民用空间基础设施中长期发展规划(2015-2025)》中规划的一颗业务星,是我国高光谱遥感能力的重要标志。高光谱观测卫星运行于高度为705km、降交点地方时为10:30的太阳同步轨道。针对细颗粒物探测,卫星配置了偏振交火传感器,通过由高精度偏振扫描仪(POSP)与大气气溶胶多角度偏振探测仪(DPC)构成的双偏振载荷的联合探测,获取观测区域的气溶胶光学厚度(AOD)、PM2.5等气溶胶信息。本文主要介绍了高光谱观测卫星总体技术方案和双偏振载荷方案,详细阐述了偏振交火模式设计要点,包括时统设计、光谱通道设置、光谱匹配设计以及视场匹配设计等工程设计。同时,对偏振交火模式的在轨性能进行了评估,评估结果表明:双偏振载荷的同步观测采集时间差优于0.4ms,视场匹配误差优于0.066POSP像元,满足反演应用需求。最后,对双偏振载荷在轨测量精度进行了交叉验证,验证结果表明辐射测量值与参考值拟合决定系数均高于0.96,线偏振度在轨交叉验证平均绝对差异优于0.0088,均满足在轨探测精度的设计要求。Hyperspectral observation satellite,launched on September 7,2021,is an operational satellite planned in the"National Medium-and Long-Term Development Plan for Civil Space Infrastructure(2015-2025)",and is an important symbol of China's hyperspectral remote sensing capability.The satellite operates in a sun-synchronous orbit with an altitude of 705 km and a local time of dscending node of 10:30 AM.For the detection of fine particulate matters,the satellite is equipped with a dual-polarization crossfire payload suite composed of a high-precision particulate obersving scanning polarimeter(POSP)and an atmospheric multi-angle aerosol directional polarization camera(DPC),so aerosol information such as AOD and PM2.5 can be obtained through the joint detection of dual-polarization payloads.This paper mainly introduces the overall technical scheme of the hyperspectral satellite and the dual polarization payloads,and elaborates on the key design points of polarization crossfire mechnism,including the engineering design of timing,spectral channel selection,spectral channel matching and field of view matching.At the same time,the on-orbit performance of the polarization crossfire detection mode is evaluated.The results show that the time synchronization accuracy of the dual-polarization payload is better than 0.4 ms,and the field of view matching accuracy is better than 0.066 pixel of POSP,meeting the requirement of aerosol inversion.Finally,the in-orbit measurement performance of dual-polarization payloads is cross-verified.It is shown that the fitting determination coefficient of radiation measurement and reference value is higher than 0.96,and the average absolute difference of linear polarization is better than 0.0088,which meets the design requirements of in-orbit detection accuracy.

关 键 词：高光谱观测卫星 细颗粒物探测 偏振交火 交叉定标 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]