摘要
高分五号卫星作为国内首颗明确提出定量化应用的卫星,定标精度要求达到了目前发射型号的最高水平。全谱段光谱成像仪作为其主要载荷,是国内高分辨率全谱段多光谱遥感器中光谱范围最宽(0.45~12.5μm)、谱段最多(12个)的载荷。它采用三反离轴光学系统分视场成像、在汇聚光路中使用分色片、红外探测器焦面前放置微型组合滤光片等光谱细分措施,实现3个探测器焦面上12个谱段的同时对地成像,1台载荷获得地物温度反演所需数据,提高数据匹配和实效性。它通过2个定标机构分别实现可见短波谱段全光路全口径漫反射板定标和中长波谱段半光路全口径黑体定标,经实验室定标、场地定标、星上定标获得星上定标系数,为用户定量应用提供了良好保障,经验证,可见短波谱段定标精度为2.6%、中长波红外谱段定标精度为0.9K。
As the first satellite in China to explicitly put forward quantitative application,the calibration accuracy of high-resolution satellite 5has reached the highest level of the current launch model.As the main load of the visible and infrared multispectral imager,it is the load with the widest spectrum range(0.45-12.5μm)and the most spectrum band(12)in the high resolution full spectrum multi-spectral remote sensor in China.It uses such spectral subdivision measures as split-field imaging of three-anti-off-axis optical system,color splitter in convergent optical path and micro-combination filter placed in front of infrared detector focal plane to realize simultaneous imaging of 12spectral segments on three detector focal planes,and one load to obtain the data needed for inversion of ground object temperature,so as to improve data matching and effectiveness.It achieves fullaperture diffuse reflector calibration in visible short-wave band and full-aperture blackbody calibration in medium and long-wave band by two calibration mechanisms respectively.The calibration coefficients on-board are obtained by laboratory calibration,site calibration and on-board calibration,which provides a good guarantee for users′quantitative application.Experience shows that the calibration accuracy of visible short-wave band is 2.6%and that of medium and long-wave infrared band is 0.9K.
作者
赵艳华
李岩
晋利兵
李永强
王浩
ZHAO Yanhua;LI Yan;JIN Libing;LI Yongqiang;WANG Hao(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Beijing Key Laboratory of Advanced Optical Remote Sensing Technology,Beijing 100094,China)
出处
《上海航天》
CSCD
2019年第S2期106-111,共6页
Aerospace Shanghai
关键词
光学遥感
全谱段
辐射定标
定量化
定标精度
optical remote sensing
full spectrum
radiometric calibration
quantification
calibration accuracy
