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首页> 外文会议>Conference on sensors, systems, and next-generation satellites XX >Update of S-NPP VIIRS Thermal Emissive Bands Radiometric Calibration Stability Monitoring Using the Moon
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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热发射带辐射校准稳定性监测

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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）是参考在大约292.5k的船上黑体（BB）上的轨道上的轨道上的轨道校准。可以基于远程目标的观察来评估其他温度范围的校准稳定性具有稳定的热性质，如月球。 VIIRs在近乎每月的近于-51度的相位角度上预定了月球的观察。在该研究中，使用与BB校准的检测器增益系数检索的月球表面的亮度温度（BT）趋势地监测VIIRS TEB的校准稳定性。由于月球表面温度在空间上不均匀并且与光度几何形状大变化，因此BT趋势必须基于相同的太阳能照明条件下的月球区域。此外，TEB月球图像始终部分饱和，因为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，临时不变动态掩模旨在剪切与月球区域对应的月球图像的一部分，其可以在任何月球事件处饱和检测器。然后趋向于剩余的最热门像素的BT。结果表明，由于viirs的推出到2016年中期，所有TEB探测器的辐射校准在高达350k的BT范围内的±0.4 k内稳定。

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