利用辐射传输模型MODTRAN5模拟计算了红外高光谱仪在光谱分辨率、光谱定标精度、地面反射率、大气廓 线以及辐射分辨率对CO2 气体含量探测敏感性的影响,同时定义探测辐亮度随气体含量改变的变化量指标S值, 并对探测灵敏度、光谱分辨率和信噪比SNR的关系进行了综合分析。为我国红外高光谱大气探测仪的设计以 及高光谱大气成分反演研究的开展提供重要的科学依据。对CO2 柱总量反演通道的选择和实现CO2 气体探 测敏感参数分析具有重要的参考价值。

The effects of spectral resolution, spectral calibration accuracy, surface reflectance, atmospheric profile, and radiation resolution on the CO2 column sensitivity for hyperspectral sounding were simulated by the infrared radiation transfer model MODTRAN5. In the meantime, sounding radiance variation index S changing with the gas content was defined. And the relationship of sounding sensitivity, spectral resolution, and signal-to-noise ratio (SNR) were comprehensively analyzed. Results can be taken as the reference for designing future hyperspectral IR sensors and developing hyperspectral retrieval algorithm. The results can provide an important reference for channel selection about CO2 column inversion and analysis about CO2 sounding sensitivity parameter.