介绍了利用机载傅里叶变换红外(FTIR)光谱仪测量地球、大气辐射的实验过程,并对由光谱仪测得的辐射与地表光谱发射率、大气透过率等参数的关系进行了深入的分析,给出了理论表达式。提出了一种基于梯度搜索的优化方法,即由机载FTIR光谱仪测得的辐亮度光谱反演得到方差最小的光谱发射率最优解。反演结果表明,在中红外波段,沙地平均光谱发射率为0.70,裸土地表平均光谱发射率为0.95。 The experimental process of measuring the radiation in the earth and the atmosphere by using the airborne Fourier Transform Infrared (FTIR) spectrometer is introduced. The relationship between the radiation measured by the spectrometer and the parameters such as the emissivity of the surface spectrum and the atmospheric transmittance is analyzed in depth. , Gives the theoretical expression. An optimization method based on gradient search is proposed, which is the optimal spectral emissivity optimal solution obtained by inversing the spectral radiance measured by airborne FTIR spectrometer. The inversion results show that in the mid-infrared band, the average spectral emissivity of sandy land is 0.70, and the average spectral emissivity of bare land is 0.95.