激光与光电子学进展, 2020, 57 (9): 092801, 网络出版: 2020-05-06  

东亚洋面AMSR2 7.3 GHz观测中的射频干扰分析 下载: 1069次

Analysis of Radio Frequency Interference in AMSR2 7.3 GHz Channels over East Asian Ocean
吴莹 1,2,*李美欣 1,2
作者单位
1 南京信息工程大学气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室, 江苏 南京 210044
2 南京信息工程大学大气物理学院, 江苏 南京 210044
摘要
基于AMSR2(Advanced microwave scanning radiometer 2)一级亮温数据,利用广义RI指数识别方法评价东亚洋面上AMSR2 7.3 GHz通道测量数据受射频干扰(RFI)信号的影响程度,并与谱差法的检测结果进行了对比分析。结果表明:二者检测出通道中RFI信号的污染位置和时间变化特征基本相同,但广义RI指数识别方法检测出的RFI信号强度更大、范围更广、像素更多;相同频率下,采用垂直极化方式观测的RFI信号比水平极化方式的多;RFI信号在东亚海域分布呈现东北—西南走向的狭长条带状,且位置和范围均随观测时间的变化而变化;对于AMSR2而言,洋面7.3 GHz通道RFI信号只出现在降轨观测中,主要来源于洋面反射的位于赤道上空静止卫星的下行信号。
Abstract
Based on the advanced microwave scanning radiometer 2 (AMSR2) first level brightness temperature data, the influence of radio frequency interference (RFI) signal on AMSR2 7.3 GHz channel measurement data over East Asian Ocean is evaluated with generalized RI index identification method, and the results are compared with those obtained by spectrum difference method. The results show that the location and time variation characteristics of the RFI signal contamination detected by the two methods are almost the same, but the RFI signal detected by the generalized RI index recognition method has larger intensity, wider range and more pixels. At the same frequency, more RFI signals are observed by vertical polarization than by horizontal polarization. The distribution of RFI signals over East Asian Ocean shows a long and narrow strip with a northeast to southwest trend, and its position and range vary with the observation time. For AMSR2, the 7.3 GHz RFI signal on the ocean surface only appears in the descending orbit observation and is mainly from the downlink signal of the stationary satellite over the equator reflected by the ocean surface.

吴莹, 李美欣. 东亚洋面AMSR2 7.3 GHz观测中的射频干扰分析[J]. 激光与光电子学进展, 2020, 57(9): 092801. Ying Wu, Meixin Li. Analysis of Radio Frequency Interference in AMSR2 7.3 GHz Channels over East Asian Ocean[J]. Laser & Optoelectronics Progress, 2020, 57(9): 092801.

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