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Rain effect on C-band scatterometer wind measurement and its correction

Zhou Xuan Yang Xiao-Feng Li Zi-Wei Yu Yang Ma Sheng

Rain effect on C-band scatterometer wind measurement and its correction

Zhou Xuan, Yang Xiao-Feng, Li Zi-Wei, Yu Yang, Ma Sheng
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  • Abstract views:  2140
  • PDF Downloads:  617
  • Cited By: 0
Publishing process
  • Received Date:  22 August 2011
  • Accepted Date:  14 November 2011
  • Published Online:  05 July 2012

Rain effect on C-band scatterometer wind measurement and its correction

  • 1. Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China;
  • 2. 741 Troops of PLA, Beijing 100095, China
Fund Project:  Project supported by the Knowledge Innovation Program of the Chinese Academy of Science (Grant No. Y0S04300KB), the Major Program for the Research Equipment of the Chinese Academy of Sciences (Grant No. YZ200946) and the National High Technology Research and Development Program of China (Grant No. 2006AA09Z137).

Abstract: It is viewed traditionally that the attenuation and scattering of rain have no effect on C-band scatterometer because its wavelength is greater than the diameter of raindrops, so rain effects on C-band scatterometer wind measurement are often ignored. According to the attenuation and the volume backscatter of the scatterometer signal by raindrops and the perturbation of the water surface by rain, in this paper, we derive the radar equation of the rainfall, collect the data from ASCAT backscatter, rain data from PR and wind field from the European Centre for Medium-Rang Weather Foremasts in 2010, and quantitatively analyze the influence of rainfall on the normalized radar backscattering cross section of the C-band scatterometer. Our results show that the attenuation increases as the rain rate and the incidence angle increase, the volume backscatter and the perturbation of the water surface increase with the increase of rain rate and decrease with the increase of incidence angle, and the influence of the perturbation on the wind measurement of the scattermeter is greater than the volume backscatter. In addition, we establish the C-band active microwave radiative transfer model for the rainfall by the radar equation and the collected data. The experimental results indicate that the new model can improve the C-band scatterometer wind measurement accuracy under rainfall conditions.

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