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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >GCOM-W1 AMSR2 Level 1R Product: Dataset of Brightness Temperature Modified Using the Antenna Pattern Matching Technique
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GCOM-W1 AMSR2 Level 1R Product: Dataset of Brightness Temperature Modified Using the Antenna Pattern Matching Technique

机译:GCOM-W1 AMSR2 1R级产品:使用天线方向图匹配技术修改的亮度温度数据集

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摘要

The Global Change Observation Mission 1st-Water (GCOM-W1) satellite, which was launched by the Japan Aerospace Exploration Agency in May 2012, contains an Advanced Microwave Scanning Radiometer-2 (AMSR2). The AMSR2 provides multifrequency measurements of microwave energy (brightness temperature) emitted by the Earth's surface and atmosphere. However, each frequency field of view (FOV) differs in size because of its hardware design. For the retrieval of more accurate geophysical parameters from multifrequency brightness temperatures, the brightness temperatures should be modified to be the same as measured in the same FOV. The Backus–Gilbert (BG) method is one of the antenna pattern matching techniques used for this modification. We applied the BG method to the AMSR2 data to define a new data set of modified brightness temperatures, a level 1R (L1R) product that is freely and widely available. We optimized the implementation of the BG method to obtain the L1R product, with smoothing factors dynamically determined for all modified brightness temperatures. This paper describes the implementation method, including the criterion used to determine the smoothing factors and presents a quality assessment of the L1R product.
机译:日本宇宙航空研究开发机构于2012年5月发射了全球变化观测任务第一水(GCOM-W1)卫星,其中包含一台先进的微波扫描辐射计2(AMSR2)。 AMSR2提供对地球表面和大气发射的微波能量(亮度温度)的多频测量。但是,由于其硬件设计,每个频率视场(FOV)的大小都不同。为了从多频亮度温度中检索更准确的地球物理参数,应该修改亮度温度,使其与在相同FOV中测得的温度相同。 Backus–Gilbert(BG)方法是用于此修改的天线方向图匹配技术之一。我们将BG方法应用于AMSR2数据,以定义修改后的亮度温度的新数据集,该数据集是可自由使用的1R级(L1R)产品。我们优化了BG方法的实现以获得L1R产品,并为所有修改后的亮度温度动态确定了平滑因子。本文介绍了实现方法,包括用于确定平滑因子的标准,并提出了L1R产品的质量评估。

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