Suppression of Surface Clutter Interference With Precipitation Measurements by Spaceborne Precipitation Radar
Suppression of Surface Clutter Interference With Precipitation Measurements by Spaceborne Precipitation Radar
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DOI：
10.1109/tgrs.2007.894580
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发表时间：
2007-04
影响因子：
8.2
通讯作者：
Tetsuya Tagawa;H. Hanado;K. Okamoto;T. Kozu
中科院分区：
文献类型：
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作者：
Tetsuya Tagawa;H. Hanado;K. Okamoto;T. Kozu
在利用星载降水雷达(PR)进行的偏天角观测中，沿天底方向的副瓣表面杂波严重干扰了降雨回波。介绍了一种抑制这种旁瓣杂波干扰的新方法。一维相控阵天线系统的一个特点是沿波束扫描平面产生高副瓣。该方法使天线波束扫描平面从最低点倾斜，使得这些高副瓣不会沿着最低点方向定向，沿该方向，地球表面后向散射雷达截面的镜面分量占主导地位。利用Ka波段星载PR的设计参数进行的仿真结果表明了该方法的有效性，并利用热带雨量测量任务/PR观测数据集进行了定量验证
The sidelobe surface clutter along the nadir direction severely interferes with the rain echo in the off-nadir angle observations made using a spaceborne Precipitation Radar (PR). A new method to suppress this sidelobe clutter interference is introduced. A characteristic of the 1-D phased array antenna system is that high sidelobes arise along the beam scan plane. The proposed method tilts the antenna beam scan plane from the nadir such that these high sidelobes would not be directed along the nadir direction, along which a specular component of the backscattering radar cross section of the Earth's surface is dominant. The simulation results using the designed parameters of a Ka-band spaceborne PR indicate the validity of this method, which is also quantitatively confirmed using Tropical Rainfall Measuring Mission/PR observation data sets