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Remote Sensing Technology and Application  2018, Vol. 33 Issue (2): 259-266    DOI: 10.11873/j.issn.1004-0323.2018.2.0259
Calibration for X-band Solid-state Weather Radar with Metal Sphere
Li Zhaoming1,2,Chen Hongbin1,Bi Yongheng1,Duan Shu1,Lu Jianbing3,Li Dongyang3,Wu Haijun3,Lei Hengchi4
(1.LAGEO,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;
2.Foshan Tornado Research Center,Foshan Meteorological Bureau,Foshan 528000,China;
3.Nanjing NRIET Co.Ltd,China Electronics Technology Group Corporation,Nanjing 211106,China;
4.LACS,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China)
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Abstract  Calibration of weather radar has a direct impact on the accuracy of detection variables and therefore is critical for most applications of radar data.In this paper,we will focus on simultaneous calibration of reflectivity (Z),differential reflectivity (ZDR) and radial velocity (V) for X-band solid\|state weather radar.To conducting calibration experiments,detailed calibration implementation plan is formulated,two test points are selected and three kinds of spheres are used.Experiments results show that the theoretically calculated Zth and measured Zm have a mean bias of 3 dB and the bias is more affected by the radius than the material of the spheres.The reflectivity has a downward trend and decreases successively from 0.4 to 0.12 dB along with the decent of sampling number.The mean ZDR is about 1.7 dB,which is large deviation in comparison with the theoretical value.The radial velocity (Ve) calculated from GPS information and observed (Vob) have a difference less than 0.1m/s.It is also found that the radar reflectivity variation of metal sphere with azimuth and elevation angles can reflect radar antenna pattern.This calibration experiments provides reference for Dual\|polarization radar.
Key words:  X-band solid-state radar      Metal sphere      Reflectivity calibration      Differential reflectivity calibration      Radial velocity calibration     
Received:  27 March 2017      Published:  15 May 2018
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Li Zhaoming
Chen Hongbin

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Li Zhaoming,Chen Hongbin. Calibration for X-band Solid-state Weather Radar with Metal Sphere. Remote Sensing Technology and Application, 2018, 33(2): 259-266.

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