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首页> 外文期刊>Applied optics >Infrared atmospheric sounder interferometer radiometric noise assessment from spectral residuals
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Infrared atmospheric sounder interferometer radiometric noise assessment from spectral residuals

机译：红外大气探测仪干涉仪根据频谱残差进行辐射噪声评估

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摘要

The problem of characterizing and estimating the radiometric noise of satellite high spectral resolution infrared spectrometers from Earth views is addressed in this paper. A methodology has been devised which is based on the common concept of spectral residuals (Observations-Calculations) obtained after spectral radiance inversion for atmospheric and surface parameters. An in-depth analytical assessment of the statistical covariance matrix of the spectral residuals has been performed which is based on the optimal estimation theory. It has been mathematically demonstrated that the use of spectral residuals to assess instrument noise leads to an effective estimator, which is largely independent of possible departures of the observational covariance matrix from the true covariances. Application to the Infrared Atmospheric Sounder Interferometer has been considered. It is shown that Earth-view-derived observation errors agree with blackbody in-flight calibration. The spectral residuals approach also proved to be effective in characterizing noise features due to mechanical microvibrations of the beam splitter of the IASI instrument. (C) 2015 Optical Society of America
机译：本文讨论了从地球视角表征和估计卫星高光谱分辨率红外光谱仪的辐射噪声的问题。已经设计了一种方法，该方法基于大气和地面参数的光谱辐射率反演后获得的光谱残差（观测-计算）的通用概念。基于最佳估计理论，对频谱残差的统计协方差矩阵进行了深入的分析评估。在数学上已经证明，使用频谱残差评估仪器噪声会导致有效的估计量，而估计量在很大程度上与观测协方差矩阵与真实协方差的可能偏差无关。已经考虑将其应用于红外大气探测器干涉仪。结果表明，从地球视角获得的观测误差与黑体飞行中的标定一致。由于IASI仪器的分束器的机械微振动，频谱残差法也被证明可有效地表征噪声特征。 （C）2015年美国眼镜学会

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