实测了积分球输出光谱辐亮度分布曲线,并得到积分球光源的分布温度.从理论上分析了积分球光源分布温度影响宽波段光学遥感器绝对辐射定标精度的原因和机理,并仿真计算了包括积分球和太阳在内的几种不同分布温度光源定标某宽波段光学遥感器时得到的定标系数.仿真结果表明,不同分布温度间的定标系数最大差别大于2％.在此基础上提出了积分球光源分布温度影响绝对辐射定标系数的校正方法,为提高宽波段遥感器的辐射定标精度和遥感图像辐射校正提供了思路和依据.%The distribution temperature of the integrating sphere was calculated according to the measured integrating sphere spectral distribution. The influence of integrating sphere source's distribution temperature on broadband optical remote sensor's absolute calibration accuracy is analyzed. The simulation experiment was carried out to calculate optical remote sensor's absolute calibration coefficient based on different distribution temperature sources, including the measured integrating sphere source and the sun. The calculation result indicated that the maximum calibration coefficient difference between different distribution temperature sources was over 2% . The correcting methods to reduce the influence of integrating sphere source's distribution temperature on broadband optical remote sensor's absolute calibration accuracy are proposed, which will provide effective method for improving radiometric calibration accuracy and calibrating remote sensing image.
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