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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Improvement of the PARASOL Radiometric In-Flight Calibration Based on Synergy Between Various Methods Using Natural Targets
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Improvement of the PARASOL Radiometric In-Flight Calibration Based on Synergy Between Various Methods Using Natural Targets

机译：基于使用自然目标的多种方法之间的协同作用，对PARASOL辐射空中校准的改进

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The Polarization and Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) mission was launched in December 2004 and was a member of the A-train up to the end of 2009. The mission was definitively stopped in December 2013 after nine years of operation. A temporal decrease of the PARASOL radiometric sensitivity occurred with a complex signature within the field of view. Using several calibration techniques, all based on the use of natural targets, it was possible to derive an efficient set of new calibration parameters which includes the absolute calibration, as well as the temporal evolution characterized by a mean decrease plus a variation within the field of view. The physical model used to fit parameters is a classical exponential decrease with a time constant of 0.018 month and an amplitude from 16% in 490 nm down to 1%–2% in the near infrared. The mean drift can be considered as estimated with an accuracy better than 0.5% per decade. The variation within the field of view, which is estimated with accuracy between 0.2% and 0.5% rms, follows a similar spectral shape as the mean instrumental drift. Some typical features were found which illustrate the ageing of the optical part of the instrument (lenses). The updated calibration, based on a synergy between various calibration methods, has significantly improved the radiometric consistency for all spectral bands of the PARASOL data archive, which represents nearly nine years of acquisitions. Finally, the PARASOL absolute calibration was confirmed with accuracy close to 2%. The last reprocessing of the full PARASOL level-1 archive has implemented these new radiometric corrections.
机译：大气科学的反射率的偏振和各向异性以及激光雷达的观测（PARASOL）于2004年12月发射，到2009年底为止一直是A列车的成员。该任务在经过9次观测后于2013年12月最终停止。多年的经营。在视野内，PARASOL辐射敏感度随时间的推移出现了复杂的特征。使用多种校准技术（全部基于自然目标），可以得出一组有效的新校准参数，其中包括绝对校准以及以平均减小量加上范围内的变化为特征的时间演变。视图。用于拟合参数的物理模型是经典的指数下降，其时间常数为0.018个月，振幅从490 nm的16％下降到近红外的1％–2％。可以认为平均漂移的估计精度优于每十年0.5％。视场内的变化（均方根值的准确度估计为0.2％至0.5％）遵循与平均仪器漂移相似的频谱形状。发现了一些典型特征，这些特征说明了仪器光学部件（透镜）的老化。基于各种校准方法之间的协同作用，更新后的校准显着改善了PARASOL数据档案库所有光谱带的辐射一致性，这代表了将近9年的采集。最终，以接近2％的精度确认了PARASOL绝对校准。完整的PARASOL 1级档案的最后一次重新处理已实现了这些新的辐射校正。

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