The Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Suomi National Polar-orbiting Partnership (SNPP) has successfully operated on-orbit for nearly ten years since its launch in October 2011, continuously making global observations and improving studies of changes in the Earth’s climate and environment. VIIRS has 22 spectral bands, among which 14 are reflective solar bands (RSBs) covering a spectral range from 0.41 to 2.25 μm. The SNPP VIIRS RSBs are primarily calibrated by the onboard solar diffuser (SD), with its on-orbit degradation tracked by an onboard SD stability monitor (SDSM). The near-monthly scheduled lunar observations, together with the sensor responses over stable ground targets, have contributed to the sensor’s mission-long on-orbit calibration and characterization. Numerous improvements have been made in the RSB calibration methodology since SNPP VIIRS was launched, and the RSB calibration has reached a mature stage after almost ten years of on-orbit operation. SNPP is a joint NASA/NOAA mission and there are two teams, the NASA VIIRS Calibration Support Team (VCST) and the NOAA VIIRS Sensor Data Record Team, which are dedicated to SNPP VIIRS on-orbit calibration. In this paper, we focus on the calibration performed by the NASA VCST. The SNPP VIIRS RSB calibration methodologies used to produce the calibration coefficient look up tables for the latest NASA Level 1B Collection 2 products are reviewed and the calibration improvements incorporated in this collection are described. Recent calibration changes include the removal of image striping caused by non-uniform degradation of the SD, improvements to the method for combining lunar and SD data, mitigation of the effects due a recent anomaly in the SD measurements, estimation of the SD degradation beyond 935 nm, and fitting strategy improvements for look-up table delivery. Overall, the SNPP VIIRS RSBs have performed well since its launch and continue to meet design specifications.

中文翻译：

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SNPP VIIRS 反射太阳波段在轨校准和性能十年

自 2011 年 10 月发射以来，Suomi 国家极地轨道合作伙伴 (SNPP) 上的可见红外成像辐射计套件 (VIIRS) 已成功在轨运行近十年，不断进行全球观测并改进对地球气候变化的研究和环境。VIIRS 有 22 个光谱带，其中 14 个是反射太阳带 (RSB)，光谱范围从 0.41 到 2.25 μm。SNPP VIIRS RSB 主要由机载太阳能扩散器 (SD) 校准，其在轨退化由机载 SD 稳定性监视器 (SDSM) 跟踪。近月计划的月球观测，以及传感器对稳定地面目标的响应，为传感器的长期在轨校准和表征做出了贡献。自SNPP VIIRS发射以来，RSB定标方法取得了多项改进，经过近十年的在轨运行，RSB定标已达到成熟阶段。SNPP 是 NASA/NOAA 的联合任务，有两个团队，NASA VIIRS 校准支持团队 (VCST) 和 NOAA VIIRS 传感器数据记录团队，专门从事 SNPP VIIRS 在轨校准。在本文中，我们专注于 NASA VCST 执行的校准。SNPP VIIRS RSB 校准方法用于为最新的 NASA 1B 级系列 2 产品生成校准系数查找表，并描述了该系列中包含的校准改进。最近的校准变化包括去除由 SD 的非均匀退化引起的图像条纹，结合月球和 SD 数据的方法的改进，减轻由于最近 SD 测量中的异常引起的影响，估计超过 935 nm 的 SD 退化，以及查找表交付的拟合策略改进。总体而言，SNPP VIIRS RSB 自推出以来表现良好，并继续满足设计规范。