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Colloquium

Department of Atmospheric Science

Tues., Jul. 18, 3:10 pm, EN6085

Evaluation of Surface Clutter for Future Geostationary Spaceborne Doppler Weather Radar

Dr. Li Xuehua

Chengdu University of Information Technology

Abstract

The surface clutter interference will be one of the important problems for the future geostationary spaceborne Doppler weather radar (GDWR). The aim of this work is to provide some numerical analysis on surface clutter interference and part of performance evaluation for the future implementation of GDWR.  The received powers of rain echo, land and sea surface from radar scattering volume are calculated numerically based on the derived radar equations, assuming uniform rain layer and appropriate land and sea surface scattering models. The study shows that most strong surface clutter comes from antenna mainlobe, and the decrease of clutter contamination through reducing the level of antenna sidelobe and range sidelobe are not obvious. In addition, the clutter interference is easily affected by rain attenuation of Ka-band. When rain intensity is greater than 10 mm/h, most of rain echoes off-nadir scanning angles will not be interfered by surface clutter.


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