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MODIS Solar Diffuser On-orbit Degradation Characterization Using Improved SDSM Screen Modeling

机译：使用改进的SDSM屏幕建模的MODIS太阳漫射器在轨降解特性

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摘要

The Solar Diffuser (SD) is used for the MODIS reflective solar bands (RSB) calibration. An on-board Solar Diffuser Stability Monitor (SDSM) tracks the degradation of its on-orbit bi-directional reflectance factor (BRF). To best match the SDSM detector signals from its Sun view and SD view, a fixed attenuation screen is placed in its Sun view path, where the responses show ripples up to 10％, much larger than design expectation. Algorithms have been developed since the mission beginning to mitigate the impacts of these ripples. In recent years, a look-up-table (LUT) based approach has been implemented to account for these ripples. The LUT modeling of the elevation and azimuth angles is constructed from the detector 9 (D9) of SDSM observations in the MODIS early mission. The response of other detectors is normalized to D9 to reduce the ripples observed in the sun-view data. The accuracy of all detectors degradation estimation depends on how well the D9 approximated. After multiple years of operation (Terra: 16 years; Aqua: 14 years), degradation behavior of all detectors can be monitored by their own. This paper revisits the LUT modeling and proposes a dynamic scheme to build a LUT independently for each detector. Further refinement in the Sun view screen characterization will be highlighted to ensure the degradation estimation accuracy. Results of both Terra and Aqua SD on-orbit degradation are derived from the improved modeling and curve fitting strategy.
机译：太阳漫射器（SD）用于MODIS反射太阳带（RSB）校准。机载太阳能扩散稳定器（SDSM）跟踪其在轨双向反射率（BRF）的下降。为了最好地匹配SDSM检测器在Sun视图和SD视图中的信号，在其Sun视图路径中放置了一个固定的衰减屏幕，该屏幕上的响应波动高达10％，远大于设计预期。自任务开始以来已经开发了算法，以减轻这些涟漪的影响。近年来，已采用基于查找表（LUT）的方法来解决这些波动。仰角和方位角的LUT建模是由MODIS早期任务中SDSM观测器的检测器9（D9）构建的。将其他检测器的响应归一化为D9，以减少在阳光数据中观察到的波动。所有检测器降级估计的准确性取决于D9的近似程度。经过多年的运行（Terra：16年； Aqua：14年），所有探测器的退化行为都可以由其自己进行监控。本文回顾了LUT建模，并提出了一种动态方案来为每个检测器独立地构建LUT。将突出显示Sun视图屏幕特性中的进一步改进，以确保降级估计的准确性。 Terra和Aqua SD在轨退化的结果均来自改进的建模和曲线拟合策略。

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