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Detection and analysis of television frequency interference from an FY-3C microwave radiation imager

  • role： First author第一作者
  • Affiliation：

    Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044, China

  • Email：zehuazhou@foxmail.com
  • Introduction：周泽华(1992—　)，男，硕士研究生，研究方向为卫星资料质量控制。E-mail：zehuazhou@foxmail.com
ZHOU Zehua,  
  • role： Corresponding author通信作者
  • Affiliation：

    Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044, China

  • Email：xzou@nuist.edu.cn
  • Introduction：邹晓蕾(1960—　)，女，教授，研究方向为资料同化。E-mail：xzou@nuist.edu.cn
ZOU Xiaolei*,  
  • Affiliation：

    Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044, China

QIN Zhengkun

реферат

Observations of a satellite Microwave Radiation Imager (MWRI) are easily interfered by signals of active remote sensing because of their similar frequency. The primary source of interference over oceans is the reflected signal of geostationary television (TV) satellites by the ocean surface. The accurate detection of such interferences is largely important for the effective use of MWRI observations and an essential preprocessing step of the MWRI data onboard the FY-3C satellite. A Normalized Principal Component Analysis Method (NPCA) is used to detect the TV Frequency Interference (TFI) signals over oceans. High correlations exist among the different MWRI channels, but the RFI signal eliminates these correlations. Hence, NPCA can detect the TFI signal by employing this aspect. The TFI signals of the MWRI at 10.65 GHz horizontal polarization over oceans are distributed widely near the coastal areas of Europe, especially the English Channel and western parts of the Mediterranean Sea. The TFI signal definitively originates from the hot bird, and its intensity is related to the angle between the MWRI incidence and geostationary satellite TV signals reflection. The threshold of the TFI signals is defined to quantify the TFI intensity. The TFI signals at 18.7 GHz are observed over the offshore marine areas of North America. As expected, no RFI signal is detected near the coastal areas of China because the geostationary satellite TV frequency over China is different from those of MWRI channels. The NPCA method can detect TFI signals over oceans. The distribution of TFI signals are in Europe at 10.65 GHz and North America at 18.7 GHz. The intensity of the TFI signals is completely related to the Glint angle. TFI signals evidently affect the result of the retrieval production. Correcting and eliminating TFI signals will be pursued in future studies. Clear brightness temperature data will also be adopted in retrieval production and data assimilation.

ключеви́че слова́

FY-3C;Microwave Radiation Imager (MWRI);ocean;television frequency interference;detection

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