摘要
介绍了超光谱成像仪的技术参量、成像原理、实验室定标和星上定标的方法.利用超光谱"图谱合一"的特点,对常规的反射率基法提出改进,实现了超光谱成像仪的辐射定标.分析了辐射定标过程中地表测量、大气参量及卫星图像产生的不确定性.结果表明:105个通道定标系数的不确定度优于7%,改进后的定标方法可以实现环境卫星超光谱成像仪的在轨辐射定标.
The technique parameter,imaging principle of HSI and the methods of calibration in laboratory and onboard are introduced.Dunhuang calibration experiment is taken for calibrating the HSI in Oct,2008.Reflectance-based calibration method was improved for Hyper-Sensor Imager,and the calibration coefficients of all channels are obtained.And,uncertainties caused by ground measurement,aerosphere parameter and satellite images in the calibration process are analyzed.The result shows that the uncertainty of the calibration coefficient of 105 channels is less than 7%.Furthermore,MODIS radiance product of the same date is used to validate the HSI calibration coefficients,which can prove that the calibration method for the HSI sensor in this article is useful and can be used to calibrate the HSI sensor in the future.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2009年第11期2826-2833,共8页
Acta Photonica Sinica
基金
国家高技术研究发展计划(2006AA12Z113)
国防科技计划环境卫星应用技术研究子专题(O7K00104KJ)资助
关键词
辐射定标
超光谱成像仪
不确定性分析
敦煌校正场
Radiometric calibration
Hyper-spectrum imager
Uncertainty analysis
Dunhuang test site
