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提出了基于自动化多通道光谱辐射计(ATR)、6SV辐射传输模型、敦煌场地历史高光谱反射率模型、中分辨率成像光谱仪(MODIS)的双向反射分布函数(BRDF)的自动化辐射定标方法。当天气状况和卫星观测几何参数满足条件时,所提方法可对遥感器进行连续辐射定标。2015年8月至2016年3月在敦煌辐射校正场进行了实验,共获取17天的有效观测数据。以“水”卫星的中分辨率成像光谱仪(AQUA/MODIS)为辐射基准,验证了所提方法的精度和定标频次。结果表明平均10~15天能够对卫星遥感器进行一次辐射定标。与AQUA/MODIS各通道观测数据相比,利用所提方法得到的大气顶反射率的相对偏差均小于5%,平均相对偏差小于2%,标准差小于2%。
The automatic radiation calibration method based on automatic multi-channel spectroradiometer (ATR), 6SV radiation transmission model, historical hyperspectral reflectance model of Dunhuang site, and MODIS (double resolution reflectance distribution function) is proposed. When the weather conditions and satellite geometry parameters meet the conditions, the proposed method for continuous radiation sensor calibration. From August 2015 to March 2016, experiments were conducted in Dunhuang Radiation Correction Field, and a total of 17 days of valid observations were obtained. The accuracy and calibration frequency of the proposed method were verified by using the medium resolution imaging spectrometer (AQUA / MODIS) of the “Water” satellite as a radiation reference. The results show that on average 10 to 15 days a satellite remote sensor calibration can be performed. Compared with the data of AQUA / MODIS channels, the relative top-off reflectance of the proposed method is less than 5%, the average relative deviation is less than 2% and the standard deviation is less than 2%.