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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >An RFI Index to Quantify the Contamination of SMOS Data by Radio-Frequency Interference
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An RFI Index to Quantify the Contamination of SMOS Data by Radio-Frequency Interference

机译：一个RFI指数，用于量化射频干扰对SMOS数据的污染

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摘要

The quality of science data provided by ESA soil moisture and ocean salinity (SMOS) satellite is degraded by the presence of artificial sources emitting in the protected part of the L-band, which is preserved for passive measurements by ITU regulation. These sources appear as high temperature points in SMOS brightness temperature products (e.g., Level 1C products), and may affect the retrievals of both SMOS (e.g., Level 2 products). In this contribution, a method is presented to quantify the impact of radio-frequency interference (RFI) on each SMOS snapshots, through the definition of an “RFI index” based on the number, position, and intensity of the RFI sources present in the snapshot. The main purpose of RFI indices is to provide the user of SMOS scientific data with information to ease the RFI filtering, thus achieving more accurate results. The comparison of RFI indices with the outputs of two different methods providing similar snapshot-wise information about RFI shows that the use of RFI indices reduces the probability of missed RFI detections, without increasing the risk for false alarms.
机译：ESA土壤湿度和海洋盐度（SMOS）卫星提供的科学数据的质量会因在L波段的受保护部分发射的人造信号的存在而降低，这些人造信号被国际电联规定保留用于被动测量。这些源在SMOS亮度温度产品（例如1C级产品）中显示为高温点，并且可能会影响两个SMOS（例如2级产品）的检索。在此贡献中，提出了一种方法，该方法通过基于“ RFI索引”的定义来量化射频干扰（RFI）对每个SMOS快照的影响，该“ RFI索引”基于存在于SMOS快照中的RFI源的数量，位置和强度。快照。 RFI索引的主要目的是为SMOS科学数据的用户提供信息，以简化RFI过滤，从而获得更准确的结果。将RFI索引与提供有关RFI的相似快照信息的两种不同方法的输出进行比较，可以看出，使用RFI索引可减少错过RFI检测的可能性，而不会增加错误警报的风险。

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