氧气吸收通道的高光谱传感器在轨光谱定标

In-flight Spectral Calibration of Oxygen Absorption Channels of Hyperspectral Sensor

通过对760nm氧气吸收特征的分析,构建波段半高宽分别为15、10、5和2.5nm的高光谱传感器模型,提出了四种光谱匹配类型和六种光谱匹配算法.基于MODTRAN辐射传输模型模拟出包含光谱偏移信息的测量光谱与参考光谱,计算出不同匹配类型和匹配算法的在轨光谱定标精度.结果表明,采用测量表观辐亮度和参考表观辐亮度作为光谱匹配类型,以相关系数作为光谱匹配算法的光谱定标精度最高.

The Oxygen absorption characteristic was analyzed and four hyperspectral sensor models were built with full width at half maximum of 15,10,5and 2.5nm.Four spectral matching styles and six spectral matching algorithms were proposed.The measured spectrum and referenced spectrum with spectral offset were simulated based on MODTRAN radiative transfer model.The spectral calibrations of hyperspectral sensor with different FWHMs were processed using four spectral matching styles and six spectral matching algorithms. Then the in-flight spectral calibration accuracy was analyzed quantitatively.The results show that the spectral calibration based on correlative coefficient of measured apparent radiance and referenced apparent radiance has the highest accuracy.