环境减灾二号A/B卫星高光谱成像仪设计与验证  

Design and Verification of Hyperspectral Imager on HJ-2A/B Satellites

作　　者：孙剑[1] 陈小来[1] 刘学斌[1] 胡炳樑[1] 李思远[1] 郝雄波 张宏建[1] 王爽[1] 张智南[1] SUN Jian;CHEN Xiaolai;LIU Xuebin;HU Bingliang;LI Siyuan;HAO Xiongbo;ZHANG Hongjian;WANG Shuang;ZHANG Zhinan(Xi’an Institute of Optics Precision Mechanic, Chinese Academy of Sciences, Xi’an 710119, China)

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119

出　　处：《航天器工程》2022年第3期55-62,共8页Spacecraft Engineering

基　　金：国家自然基金项目(410050189)。

摘　　要：高光谱成像仪是环境减灾二号A/B卫星上唯一可以获取高光谱数据的载荷。文章从幅宽和空间分辨率2个方面介绍了国内外高光谱成像仪的发展现状;基于大孔径静态干涉光谱成像(LASIS)技术原理和高光谱成像仪系统组成,提出幅宽增大和空间分辨率提高会带来偏流角偏差控制和高速图像传输等问题;对摆镜“轻巧型”结构、高精度运动部件及大尺寸高精度干涉仪进行设计,以满足偏流角偏差分析提出的高光谱成像仪推扫方向与探测器光谱方向夹角优于2.7′的要求,采用大面阵CCD高速成像技术,实现电路规模仅为原有技术的1/4。环境试验和在轨成像结果表明:高光谱成像仪调制传递函数(MTF)大于0.24,星上定标精度优于2 nm,在轨获取的可见光近红外(VNIR)及短波红外(SWIR)光谱图像立方体正确,曲线准确度相对偏差优于5%,高光谱成像仪的设计具有有效性。Hyperspectral imager is the only spectrometer on HJ-2A/B satellites,and can acquire hyperspectral data.The development of spaceborne hyperspectral imager is introduced from two aspects of swath width and spatial resolution.The drift angle and high-speed imaging transmission technology are discussed caused by wide swath width and high spatial resolution,based on the LASIS(large aperture static imaging spectrometer)and system composition of hyperspectral imager.The structures of lightweight type scanning mirror system,high-precise moving parts,large-scale and high-precise interferometer are proposed,to ensure that the angle between scanner and CCD(charge couple device)can be less than 2.7′.The high-speed imaging technology of large array CCD camera is discussed,which the scale of circuit is a quarter of original.The environmental test and on-orbit test results indicate that MTF(modulation transfer function)is more than 0.24,and the accuracy of calibration onboard is less than 2nm.The spectral datacube from satellite data in VNIR(visible and near-infrared)and SWIR(short-wave infrared)is correct,and the accuracy of fringe curve is less than 5%.The design of hyperspectral imager is effective.

关 键 词：环境减灾二号A/B卫星 高光谱成像仪 可见光近红外 短波红外 大孔径静态干涉光谱成像 

分 类 号：V443[航空宇航科学与技术—飞行器设计]