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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Identification of Ocean-Reflected Radio-Frequency Interference Using WindSat Retrieval Chi-Square Probability
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Identification of Ocean-Reflected Radio-Frequency Interference Using WindSat Retrieval Chi-Square Probability

机译:利用WindSat检索卡方概率识别海反射无线电频率干扰

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Ocean retrievals using passive microwave radiometers are sensitive to small fluctuations in ocean brightness temperatures. As such, the signals emanating from geostationary satellites that reflect off the ocean surface can result in large errors in ocean retrievals. Since geostationary communication satellites maintain fixed positions above the Earth and constantly transmit to predetermined regions while most other error sources, e.g., precipitation, are transient, time-averaged retrieval error statistics can be used to identify regions of measurements contaminated with radio-frequency interference (RFI). This letter describes a new method of identifying regions of ocean where ocean retrievals are affected by geostationary communication (television) satellites by using geophysical retrieval chi-square probability (goodness-of-fit) estimates. A three-month time-averaged collection of retrieval chi-square estimates is used to identify regions of the ocean where RFI may be present. This information is combined with information on geostationary satellite bandwidths, locations, and antenna contours to identify the source of the RFI. A mask derived from the analysis is used, in conjunction with satellite geometry calculations, to flag individual channels for RFI. These channels can then be ignored in the geophysical retrieval processing in order to produce uncontaminated ocean retrievals.
机译:使用无源微波辐射计进行的海洋取回对海洋亮度温度的微小波动敏感。因此,从地球表面反射回来的对地静止卫星发出的信号可能会导致海洋取回方面的重大错误。由于地球静止通信卫星在地球上方保持固定位置并不断发射到预定区域,而大多数其他误差源(例如降水)是瞬态的,因此可以使用时间平均取回误差统计信息来识别受射频干扰污染的测量区域( RFI)。这封信介绍了一种通过使用地球物理检索卡方概率(拟合优度)估计来识别海洋检索受地球同步通信(电视)卫星影响的海洋区域的新方法。使用三个月时间平均的检索卡方估计值来确定可能存在RFI的海洋区域。该信息与有关对地静止卫星带宽,位置和天线轮廓的信息结合在一起,以识别RFI的来源。从分析中得出的遮罩与卫星几何计算一起用于标记RFI的各个通道。然后可以在地球物理检索过程中忽略这些通道,以产生未受污染的海洋检索。

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