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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Modeling the Detector Radiometric Gains of the Suomi NPP VIIRS Reflective Solar Bands
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Modeling the Detector Radiometric Gains of the Suomi NPP VIIRS Reflective Solar Bands

机译：Suomi NPP VIIRS反射太阳波段的探测器辐射增益建模

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摘要

Right after the opening of the nadir door of the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the Suomi National Polar-orbiting Partnership satellite, the detector gains of the near-infrared bands had decreased much faster than expected, indicating large degradation of the VIIRS optical system. To help determine the root cause and to access the potential outcome of the degradation, we developed a mathematical model based on a physical hypothesis that the observed degradation was due to the sensor Rotating Telescope Assembly (RTA) mirror surface contamination. To date, the detector gains have been consistent with a physical model of a thin contaminant layer of material on each of the four RTA reflective mirrors. The contaminated material, after exposure to solar radiation, reduces the mirror reflectance over the reflective solar band (RSB) wavelength region. We describe the mathematical model and apply the model to predict the RSB detector gains at the end of seven-year mission operation. The model also projects that the signal-to-noise ratios of the RSB will all be larger than the design requirements with a margin of at least 25% at the end of seven years of mission operation. In addition, the detector relative spectral response (RSR) is modulated by the wavelength-dependent optical throughput degradation. We compute the modulated RSR and its impacts on sensor radiometric calibration and the computed top-of-the-atmosphere spectral reflectance at the Sensor Data Record level.
机译：在Suomi国家极地轨道合作伙伴卫星上的可见红外成像辐射计套件（VIIRS）的天底门打开后，近红外波段的探测器增益下降速度比预期的要快得多，这表明VIIRS的衰减很大光学系统。为了帮助确定根本原因并了解退化的潜在结果，我们基于物理假设开发了一个数学模型，该物理假设观察到的退化是由于传感器旋转望远镜组件（RTA）镜面污染所致。迄今为止，探测器的增益与四个RTA反射镜上每个材料的污染物薄层的物理模型一致。受污染的材料在暴露于太阳辐射后会降低反射太阳波段（RSB）波长范围内的镜面反射率。我们描述了数学模型，并应用该模型预测了7年任务运行结束时的RSB检测器增益。该模型还预测，RSB的信噪比都将大于设计要求，并且在任务运行七年结束时的裕度至少为25％。另外，探测器相对光谱响应（RSR）通过与波长有关的光通量衰减来调节。我们在传感器数据记录级别计算调制后的RSR及其对传感器辐射定标的影响以及计算出的大气最高光谱反射率。

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