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S-NPP VIIRS thermal emissive bands on-orbit calibration and performance

机译:S-NPP VIIRS热发射带在轨校准和性能

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Presented is an assessment of the on-orbit radiometric performance of the thermal emissive bands (TEB) of the Suomi National Polar-orbiting Partnership (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) instrument based on data from the first 2 years of operations—from 20 January 2012 to 20 January 2014. The VIIRS TEB are calibrated on orbit using a V-grooved blackbody (BB) as a radiance source. Performance characteristics trended over the life of the mission include the F factor—a measure of the gain change of the TEB detectors; the Noise Equivalent differential Temperature (NEdT)—a measure of the detector noise; and the detector offset and nonlinear terms trended at the quarterly performed BB warm-up cool-down cycles. We find that the BB temperature is well controlled and stable within the 30mK requirement. The F factor trends are very stable and showing little degradation (within 0.8%). The offsets and nonlinearity terms are also without noticeable drifts. NEdT is stable and does not show any trend. Other TEB radiometric calibration-related activities discussed include the on-orbit assessment of the response versus scan-angle functions and an approach to improve the M13 low-gain calibration using onboard lunar measurements. We conclude that all the assessed parameters comply with the requirements, and the TEB provide radiometric measurements with the required accuracy.
机译:提出的是基于2004年前两年的数据,对Suomi国家极地轨道合作伙伴关系(S-NPP)可见红外成像辐射计套件(VIIRS)的热发射带(TEB)的在轨辐射性能进行评估。从2012年1月20日至2014年1月20日。VIIRS TEB使用V型槽黑体(BB)作为辐射源在轨道上进行了校准。在执行任务的整个生命周期中表现出的性能特征包括F因子,即TEB检测器增益变化的量度;噪声等效温差(NEdT)-检测器噪声的量度;检波器失调和非线性项在每个季度执行的BB预热冷却周期中呈趋势。我们发现BB温度在30mK的要求范围内得到了很好的控制和稳定。 F因子趋势非常稳定,几乎没有退化(在0.8%以内)。偏移和非线性项也没有明显的漂移。 NEdT稳定,没有任何趋势。讨论的其他与TEB辐射定标有关的活动包括响应与扫描角功能的在轨评估以及使用机载月球测量来改善M13低增益定标的方法。我们得出的结论是,所有评估的参数均符合要求,并且TEB提供所需精度的辐射测量。

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