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GF-5全谱段光谱成像仪星上定标组件在轨性能评价

黄文薪 Huang Wenxin,张黎明 Zhang Liming,司孝龙 Si Xiaolong,许和鱼 Xu Heyu,陈洪耀 Chen Hongyao, 李鑫 Li Xin,赵艳华 Zhao Yanhua

ACTA OPTICA SINICA（2020）

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Abstract
介绍了高分五号全谱段光谱成像仪(VIMI)可见近红外波段星上定标组件的组成和工作方式,分析了VIMI发射后星上12次太阳漫反射板(SD)双向反射分布函数(BRDF)的量值衰减情况.对比SD反射率衰减监测仪(SDRDM)长期观测的太阳数据表明,不同监测波段探测器的衰减程度不同,其中900 nm监测波段的硅探测器衰减最大,约为4.3％.当入射角与观测方位夹角接近时,SD BRDF的衰减因子(H因子)变化很小.根据H因子的物理模型得到SDRDM实际监测的测量不确定度小于0.86％,满足小于1.5％的指标要求,且VIMI星上定标组件全寿命期输出光谱的辐亮度不确定度小于3.4％.
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Key words
bidirectional reflectance distribution function, solar diffuser, radiometric calibration, silicon detector
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