X波段雙線偏振雷達回波強度衰減和地物回波識別訂正

doi:10.3969/2012jms.0183

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X波段雙線偏振雷達回波強度衰減和地物回波識別訂正
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                        10.3969/2012jms.0183
                    
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基金項目:國家重點基礎研究發(fā)展規(guī)劃項目（2007AA061901）

Schemes for attenuation correction of radar reflectivity factor, ground clutter discrimination and compensation of a X-band dual-polarization radar

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摘要:

與常規(guī)雷達相比，雙線偏振天氣雷達在降水系統(tǒng)的準確探測、資料質(zhì)量的提高等方面具有明顯的優(yōu)勢，但X波段雙線偏振雷達資料受衰減和地物的影響較大，需要進行必要的衰減和地物訂正。本文以2010年7月中國氣象局在廣東陽江開展的遙感數(shù)據(jù)比對試驗得到數(shù)據(jù)為例，用Z_H和Z_DR結(jié)合的方法對Z_H進行衰減訂正，用Z_H和Z_DR的方差識別地物回波，并利用反射率因子垂直廓線訂正受地物影響的底層回波。將訂正后的Z_H與S波段雷達探測的Z_H相比較，將訂正后的Z_H與K_DP的散點圖和擬合的K_DP與Z_H曲線關(guān)系對比驗證。結(jié)果表明經(jīng)過訂正的Z_H與S波段雷達探測的Z_H一致性較好，與擬合曲線也更為吻合，說明方法能有效提高雷達資料的質(zhì)量。

Abstract:

Compared with conventional radar, dual-polarization weather radar has obvious advantages in precipitation system detection, data quality improvement, etc. However, X-band dual-polarization radar data are so easily influenced by attenuation and ground clutter, so that attenuation and clutter corrections are necessary for them. Based on the X-band dual-polarization radar data from the test carried out by China Meteorological Administration in July 2010 in Yangjiang, Guangdong, the attenuation effect on Z_H is corrected by Z_H and Z_DR; ground clutter is identified by the variance of Z_H and Z_DR, and the data combination affected by ground clutter is corrected by the vertical profile of reflectivity factor. In order to verify the effect of corrections, we compared the corrected Z_H with that detected by S-band radar, the scatter plot of Z_H and K_DP after corrections with the fitted curve of them. The results show the corrected Z_H is consistent with that detected by S-band radar as well as with the fitted curve, it means that the methods can improve the quality of the radar data effectively.

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吳歡,黃興友. X波段雙線偏振雷達回波強度衰減和地物回波識別訂正.氣象科學,2014,34(1):32-38 WU Huan, HUANG Xingyou. Schemes for attenuation correction of radar reflectivity factor, ground clutter discrimination and compensation of a X-band dual-polarization radar. Journal of the Meteorological Sciences,2014,34(1):32-38

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收稿日期:2012-10-31
最后修改日期:2012-12-04
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在線發(fā)布日期: 2014-02-21
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