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Update of S-NPP VIIRS Thermal Emissive Bands Radiometric Calibration Stability Monitoring Using the Moon

机译：使用月球更新S-NPP VIIRS热发射带辐射度校准稳定性监测

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摘要

The Suomi-NPP VIIRS thermal emissive bands (TEB) are radiometrically calibrated on-orbit with reference to an onboard blackbody (BB) regularly operated at approximately 292.5 K. The calibration stability at other temperature ranges can be evaluated based on the observations of remote targets with stable thermal properties, such as the Moon. VIIRS has scheduled viewings of the Moon on a nearly monthly basis at a phase angle of nearly -51 degrees. In this study, the brightness temperatures (BT) of the lunar surface retrieved using the detector gain coefficients calibrated with the BB are trended to monitor the calibration stability of VIIRS TEB. Since the Lunar surface temperatures are spatially non-uniform and vary greatly with the photometric geometry, the BT trending must be based on the same regions of the Moon under the same solar illumination condition. Also, the TEB lunar images are always partially saturated because the highest lunar surface temperatures are beyond the dynamic range of all VIIRS TEB detectors. Therefore, a temporally invariant dynamic mask is designed to clip a fraction of the lunar images corresponding to the regions of the Moon that may saturate the detector at any lunar event. The BT of the remaining hottest pixels are then trended. Results show that, since the launch of VIIRS to mid-2016, the radiometric calibration of all TEB detectors has been stable within ±0.4 K at the BT range of as high as 350 K.
机译：Suomi-NPP VIIRS热发射带（TEB）相对于通常在大约292.5 K下运行的机载黑体（BB）在轨进行辐射定标。可以根据对远程目标的观察来评估在其他温度范围内的定标稳定性具有稳定的热特性，例如月球。 VIIRS计划以近-51度的相角近乎每月一次地观看月球。在这项研究中，使用通过BB校准的探测器增益系数获取的月球表面的亮度温度（BT）趋向于监测VIIRS TEB的校准稳定性。由于月球表面温度在空间上是不均匀的，并且随光度学几何形状而变化很大，因此BT趋势必须基于在相同太阳光照条件下月球的相同区域。另外，由于最高的月球表面温度超出了所有VIIRS TEB探测器的动态范围，因此TEB的月球图像始终会部分饱和。因此，设计了一个时不变的动态蒙版，以裁剪对应于月球区域的一部分月球图像，在任何月球事件时，月球区域可能会使检测器饱和。然后，对其余最热像素的BT进行趋势分析。结果表明，自从VIIRS发射到2016年中以来，在高达350 K的BT范围内，所有TEB检测器的辐射校准一直稳定在±0.4 K之内。

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