Improved algorithm for determining the Visible Infrared Imaging Radiometer Suite Day/Night Band high-gain stage dark offset free from light contamination

Gu Yalong; Uprety Sirish; Blonski Slawomir; Zhang Bin; Cao Changyong

摘要

Dark offset is one of the key parameters for Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) high-gain stage (HGS) radiometric calibration, whose accuracy strongly impacts applications of DNB low-light detection for Earth observation at nighttime. Currently, DNB observation of the VIIRS onboard calibrator blackbody (OBCBB) view, together with its observation of deep space during the spacecraft pitch maneuver performed early in the mission, has been used to compute the HGS dark offset continuously. However, the relationship between the DNB OBCBB data and the Earth view (EV) data is unclear due to electronic timing differences between these two views. It is questionable whether the DNB OBCBB data can monitor the EV HGS dark offset change. Through comprehensive analysis of the DNB OBCBB data and EV data acquired from the monthly special acquisitions known as the VIIRS recommended operating procedures (VROPs), we have shown that the OBCBB data can only track the dark current component of the DNB HGS EV dark offset, instead of the total dark offset. The DNB observation of deep space during the spacecraft pitch maneuver was also contaminated by starlight. With such background, in this paper we propose an improved algorithm for determining the DNB HGS dark offset. By combined use of the DNB OBCBB data and the DNB VROP data, the generated DNB HGS dark offset is both free from light contamination and capable of tracking continuous drift. The improved algorithm could potentially improve the DNB radiometric performance at low radiance level. Our results provide a solid theoretical basis for dark offset calibration of the VIIRS DNB onboard Suomi National Polar-Orbiting Partnership satellite and the following Joint Polar Satellite System satellites. (C) 2019 Optical Society of America

机译：暗偏移是可见红外成像辐射计套件（VIIRS）日/夜间带（DNB）高增益级（HGS）辐射校准的关键参数之一，其精度强烈影响DNB低光检测在夜间地球观察的应用。目前，DNB观察Viirs校准器黑体（OBCBB）视图，以及在使命早期进行的航天器间距机动期间的深度空间观察，已被用来连续计算HGS暗偏移。然而，由于这两个视图之间的电子定时差异，DNB OBCBB数据和地球视图（EV）数据之间的关系尚不清楚。 DNB OBCBB数据是否可以监视EV HGS黑暗偏移变化是值得怀疑的。通过对DNB OBCBB数据和EV数据的全面分析从每月特殊收购所获取的VIIR推荐操作程序（VROPS），我们已经显示了OBCBB数据只能跟踪DNB HGS EV黑暗偏移的暗电流分量，而不是总黑暗偏移。航天器间距机动期间的深层空间的DNB观察也受星光污染。利用这种背景，在本文中，我们提出了一种改进的算法来确定DNB HGS暗偏移。通过组合使用DNB OBCBB数据和DNB VROP数据，所生成的DNB HGS暗偏移既不自由光污染，也能够跟踪连续漂移。改进的算法可能在低辐射水平下潜在地改善DNB辐射性能。我们的结果为Viirs DNB船上苏米国家极性轨道卫星卫星和以下联合极性卫星系统卫星提供了稳定的理论依据。（c）2019年光学学会

Improved algorithm for determining the Visible Infrared Imaging Radiometer Suite Day/Night Band high-gain stage dark offset free from light contamination

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