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首页> 外文期刊>Applied optics >On-orbit calibration of the Suomi National Polar-Orbiting Partnership Visible Infrared Imaging Radiometer Suite for ocean color applications
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On-orbit calibration of the Suomi National Polar-Orbiting Partnership Visible Infrared Imaging Radiometer Suite for ocean color applications

机译：Suomi国家极地轨道合作伙伴可见光红外成像辐射计套件的在轨校准，用于海洋颜色应用

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The NASA Ocean Biology Processing Group (OBPG) developed two independent calibrations of the Suomi National Polar-Orbiting Partnership (SNPP) Visible Infrared Imaging Radiometer Suite (VIIRS) moderate resolution reflective solar bands using solar diffuser measurements and lunar observations, and implemented a combined solar- and lunar-based calibration to track temporal changes in radiometric response of the instrument. Differences between the solar and lunar data sets have been used to identify issues and verify improvements in each. Linearization of the counts-to-radiance conversion yields a more consistent calibration at low radiance levels. Correction of a recently identified error in the VIIRS solar unit vector coordinate frame has been incorporated into the solar data and diffuser screen transmission functions. Temporal trends in the solar diffuser stability monitor data have been evaluated and addressed. Fits to the solar calibration time series show mean residuals per band of 0.067%-0.17%. Periodic residuals in the VIIRS lunar data are confirmed to arise from a wavelength-dependent libration effect for the sub-spacecraft point in the output of the U.S. Geological Survey Robotic Lunar Observatory photometric model of the Moon. Temporal variations in the relative spectral responses for each band have been assessed, and significant impact on band M1 (412 nm) lunar data has been identified and rectified. Fits to the lunar calibration time series, incorporating sub-spacecraft point libration corrections, show mean residuals per band of 0.069%-0.20%. Lunar calibrations have been used to adjust the solar-derived radiometric corrections for bands M1, M3, and M4. After all corrections, the relative differences in the solar and lunar calibrations for bands M1-M7 are 0.093%-0.22%. The OBPG has achieved a radiometric stability for the VIIRS on-orbit calibration that is commensurate with those achieved for SeaWiFS and Aqua MODIS, supporting the incorporation of VIIRS data into the long-term NASA ocean color data record. (C) 2015 Optical Society of America
机译：NASA海洋生物处理小组（OBPG）使用太阳漫射器测量和月球观测，开发了Suomi国家极地轨道合作伙伴关系（SNPP）可见红外成像辐射计套件（VIIRS）中分辨率反射太阳波段的两次独立校准，并实施了组合太阳-和基于月球的校准，以跟踪仪器辐射响应的时间变化。太阳和月球数据集之间的差异已用于识别问题并验证每个数据集的改进。计数到辐射转换的线性化可以在低辐射水平下实现更一致的校准。 VIIRS太阳单位矢量坐标系中最近发现的错误的校正已合并到太阳数据和散射屏传输功能中。太阳扩散器稳定性监测器数据的时间趋势已得到评估和解决。与太阳校准时间序列的拟合显示，每条带的平均残差为0.067％-0.17％。确认VIIRS月球数据中的周期性残差是由于美国地质调查机器人月球天文台光度学模型的输出中子航天器点的波长依赖的释放效应引起的。已经评估了每个波段相对光谱响应的时间变化，并且已经确定并纠正了对波段M1（412 nm）月球数据的重大影响。符合月球校准时间序列，并结合了亚航天器的点解放修正，显示出每条带的平均残差为0.069％-0.20％。月球校准已用于调整M1，M3和M4波段的太阳辐射校正。经过所有校正后，M1-M7波段太阳和月球校准的相对差异为0.093％-0.22％。 OBPG已为VIIRS的在轨校准实现了辐射稳定性，与SeaWiFS和Aqua MODIS的校准相当，从而支持将VIIRS数据纳入长期的NASA海洋颜色数据记录。 （C）2015年美国眼镜学会

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