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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >New On-Orbit Calibration Approach of SNPP VIIRS Reflective Solar Bands Using the Full Profile of Direct Solar Illumination of Solar Diffuser
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New On-Orbit Calibration Approach of SNPP VIIRS Reflective Solar Bands Using the Full Profile of Direct Solar Illumination of Solar Diffuser

机译：SNPP VIIRS反射太阳波段的全新在轨校准方法，使用太阳漫射器的直接太阳照明全过程

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摘要

A methodological variant of the standard on-orbit calibration of reflective solar bands (RSBs) is presented for the Visible Imaging Infrared Radiometer Suite (VIIRS) housed in the Suomi National Polar-orbiting Partnership (SNPP) satellite. The new variant uses the full profile of direct solar illumination of the solar diffuser (SD), including both full and partial illuminations, to characterize the on-orbit gain change of the RSBs, differing from the standard approach that uses a smaller "sweet spot" subinterval within the full-illumination stage. The extended incident angular range of the solar light requires a new characterization analysis of the impact of the transmission function of the SD screen, SD bidirectional reflectance factor (BRF), and other affected calibration steps. Instead of the standard a priori derivation of the known characterization functions for the wider range, this analysis directly characterizes their manifested impact in the instrument data through a step-by-step extraction from a selected three-year period to build up a series of intermediate functions that are applicable mission-long. This newly adopted procedure presents a significant simplification as well as more clarity of the characterization analysis. The new RSB calibration coefficient of the full-profile approach is extracted for all 14 RSBs of SNPP VIIRS and is shown to be stable and smooth at the level of 0.1%. For bands M5 and above, the full-profile result achieves excellent agreement with the standard result, whereas results for bands M1-M4 diverge, in particular up to 2% for band M1, the shortest wavelength RSB at 410 nm. The finding elucidates a key challenge of the on-orbit RSB calibration arising from the nontrivial angular dependence of the on-orbit degradation of SD that introduces calibration error into any SD-based approach, such that the on-orbit RSB calibration result is not stable with different choices of the angular range of incident and outgoing light with respect to the SD. A detailed discussion of the nontrivial angular dependence in SD degradation is provided in the context of the known on-orbit RSB calibration results and recent findings, including discrepancy with the lunar-based calibration for bands M1-M4.
机译：针对Suomi国家极地轨道合作伙伴（SNPP）卫星中的可见成像红外辐射计套件（VIIRS），提出了反射太阳波段（RSB）的标准在轨校准方法的变体。新的变体使用太阳能扩散器（SD）的直接太阳光的全部轮廓，包括全部和部分光，来表征RSB的在轨增益变化，这与使用较小“最佳点”的标准方法不同。 ”在整个照明阶段的子间隔。扩展的太阳光入射角范围要求对SD屏幕的透射功能，SD双向反射系数（BRF）和其他受影响的校准步骤的影响进行新的特性分析。通过对选定的三年期间进行逐步提取，以建立一系列中间变量，该分析可以直接表征其对仪器数据的明显影响，而不是对更广范围的已知特征函数进行先验推导的标准。任务期间适用的功能。这种新近采用的程序极大地简化了表征分析，并使其更加清晰。针对SNPP VIIRS的所有14个RSB提取了全轮廓方法的新RSB校准系数，并显示在0.1％的水平上稳定且平滑。对于M5及以上的波段，全谱结果与标准结果达到了极好的一致性，而对于M1-M4波段，结果却发散了，特别是对于波段M1（在410 nm处的最短波长RSB）高达2％。这一发现阐明了在轨RSB校准面临的主要挑战，这是由于SD在轨退化的非平凡的角度依赖性导致的，这将校准误差引入任何基于SD的方法中，从而使得在轨RSB校准结果不稳定相对于SD，入射光和出射光的角度范围有不同的选择。在已知的在轨RSB校准结果和最新发现（包括与M1-M4波段基于月球校准的差异）的背景下，对SD退化中非平凡的角度依赖性进行了详细讨论。

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