Vicarious Cold Calibration for Conical Scanning Microwave Imagers
Vicarious Cold Calibration for Conical Scanning Microwave Imagers
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DOI：
10.1109/tgrs.2016.2615552
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发表时间：
2017-02
影响因子：
8.2
通讯作者：
Rachael A. Kroodsma;D. McKague;C. Ruf
中科院分区：
文献类型：
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作者：
Rachael A. Kroodsma;D. McKague;C. Ruf
分析了星载微波辐射计的替代冷定标方法，并将其应用于6 ~ 90 GHz的圆锥扫描微波成像仪。算法的细节被修改以考虑原始算法的开发中不包括的附加频率和极化。改进后的算法比原算法能产生更稳定的冷参考亮温。对该更新的算法进行分析，以显示有助于推导冷参考TB的全局区域，并显示哪些地球物理参数有助于最冷的TB。分析表明，水蒸气的变化对VCC算法中的TB的影响最大。将改进的VCC算法应用于微波成像仪数据，并用作互校准方法。结果表明，该方法与其他互定标方法具有良好的一致性，是一种有效、准确的微波成像仪互定标方法。
Vicarious cold calibration (VCC) for spaceborne microwave radiometers is analyzed and modified for application to conical scanning microwave imagers at frequencies from 6 to 90 GHz. The details of the algorithm are modified to account for additional frequencies and polarizations that were not included in the development of the original algorithm. The modified algorithm is shown to produce a more stable cold reference brightness temperature (TB) than the original algorithm. An analysis is performed of this updated algorithm to show the global regions that contribute to the derivation of the cold reference TB and to show which geophysical parameters contribute to the coldest TBs. The analysis suggests that water vapor variability has the largest impact on the TBs in the VCC algorithm. The modified VCC algorithm is applied to microwave imager data and is used as an intercalibration method. It is shown to agree well with other intercalibration methods, demonstrating that it is a valid and accurate method for calibration of microwave imagers.