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首页> 外文会议>Conference on Earth Observing Systems VII, Jul 7-10, 2002, Seattle, USA >Absolute Irradiance of the Moon for On-orbit Calibration
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Absolute Irradiance of the Moon for On-orbit Calibration

机译：月球绝对辐照度用于在轨校准

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摘要

The recognized need for on-orbit calibration of remote sensing imaging instruments drives the ROLO project effort to characterize the Moon for use as an absolute radiance source. For over 5 years the ground-based ROLO telescopes have acquired spatially-resolved lunar images in 23 VNIR (Moon diameter ～500 pixels) and 9 SWIR (～250 pixels) passbands at phase angles within+-90 degrees. A numerical model for lunar irradiance has been developed which fits hundreds of ROLO images in each band, corrected for atmospheric extinction and calibrated to absolute radiance, then integrated to irradiance. The band-coupled extinction algorithm uses absorption spectra of several gases and aerosols derived from MODTRAN to fit time-dependent component abundances to nightly observations of standard stars. The absolute radiance scale is based upon independent telescopic measurements of the star Vega. The fitting process yields uncertainties in lunar relative irradiance over small ranges of phase angle and the full range of lunar libration well under 0.5%. A larger source of uncertainty enters in the absolute solar spectral irradiance, especially in the SWIR, where solar models disagree by up to 6%. Results of ROLO model direct comparisons to spacecraft observations demonstrate the ability of the technique to track sensor responsivity drifts to sub-percent precision. Intercomparisons among instruments provide key insights into both calibration issues and the absolute scale for lunar irradiance.
机译：公认的遥感成像仪器在轨校准的需求推动了ROLO项目的努力，以表征用作绝对辐射源的月球。超过5年的时间，地面ROLO望远镜已经在23个VNIR（月球直径〜500像素）和9个SWIR（〜250像素）通带中获取了空间分辨的月球图像，相位角在+ -90度以内。已经开发了一个月球辐照度的数值模型，该模型适合每个波段中的数百个ROLO图像，针对大气消光进行校正并校准为绝对辐射度，然后积分为辐照度。带耦合消光算法使用源自MODTRAN的几种气体和气溶胶的吸收光谱，将随时间变化的成分丰度与标准恒星的夜间观测值进行拟合。绝对辐射率标度基于恒星Vega的独立望远镜测量。拟合过程在较小的相角范围内以及在0.5％以下的整个月球释放范围内产生了相对的月照度不确定性。更大的不确定性来源来自绝对太阳光谱辐照度，特别是在SWIR中，其中太阳模型的差异高达6％。 ROLO模型与航天器观测结果的直接比较结果表明，该技术能够跟踪传感器的响应度漂移，精确度达不到百分之一。仪器之间的比对可提供有关校准问题和月球辐照度绝对比例的关键见解。

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