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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Determination of the SNPP VIIRS SDSM Screen Relative Transmittance From Both Yaw Maneuver and Regular On-Orbit Data
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Determination of the SNPP VIIRS SDSM Screen Relative Transmittance From Both Yaw Maneuver and Regular On-Orbit Data

机译：从偏航操纵和常规在轨数据确定SNPP VIIRS SDSM屏幕相对透射率

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摘要

The Visible Infrared Imaging Radiometer Suite aboard the Suomi National Polar-orbiting Partnership (SNPP) satellite performs radiometric calibration of its reflective solar bands primarily through observing a sunlit onboard solar diffuser (SD). The SD bidirectional reflectance distribution function (BRDF) degradation factor is determined by an onboard SD stability monitor (SDSM), which observes the Sun through a pinhole screen and the sunlit SD. The transmittance of the SDSM pinhole screen over a range of solar angles was determined prelaunch and used initially to determine the BRDF degradation factor. The degradation-factor-versus-time curves were found to have a number of very large unphysical undulations likely due to the inaccuracy in the prelaunch determined SDSM screen transmittance. To refine the SDSM screen transmittance, satellite yaw maneuvers were carried out. With the SDSM screen relative transmittance determined from the yaw maneuver data, the computed BRDF degradation factor curves still have large unphysical ripples, indicating that the projected solar horizontal angular step size in the yaw maneuver data is too large to resolve the transmittance at a fine angular scale. We develop a methodology to use both the yaw maneuver and a small portion of regular on-orbit data to determine the SDSM screen relative transmittance at a fine angular scale. We determine that the error standard deviation of the calculated relative transmittance ranges from 0.00030 (672 nm) to 0.00092 (926 nm). With the newly determined SDSM screen relative transmittance, the computed BRDF degradation factor behaves much more smoothly over time.
机译：Suomi国家极地轨道合作伙伴（SNPP）卫星上的可见红外成像辐射计套件主要通过观察机载阳光照射的太阳漫射器（SD）对其反射太阳波段进行辐射度校准。 SD双向反射率分布函数（BRDF）降级系数由板载SD稳定性监控器（SDSM）确定，该监控器通过针孔屏和日照SD观察太阳。在启动前确定SDSM针孔筛在整个太阳角范围内的透射率，并最初用于确定BRDF降解因子。发现降解因子对时间的曲线具有许多非常大的非物理起伏，这可能是由于预启动的确定的SDSM屏幕透射率的不准确所致。为了改善SDSM屏幕的透射率，进行了卫星偏航操纵。使用由偏航操纵数据确定的SDSM屏幕相对透射率，计算出的BRDF退化因子曲线仍然具有较大的非物理波动，这表明偏航操纵数据中的投影太阳水平角步长太大，无法解决在细角度下的透射率规模。我们开发了一种方法，可以同时使用偏航操纵和一小部分常规轨道数据来确定小角度尺度下SDSM屏幕的相对透射率。我们确定所计算的相对透射率的误差标准偏差范围为0.00030（672 nm）至0.00092（926 nm）。使用新确定的SDSM屏幕相对透射率，计算出的BRDF降级因数随时间表现得更加平滑。

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