X波段双线偏振雷达反射率不同衰减订正法对比分析

Comparison of Different Attenuation Correction Methods using X-band Dual Polarimetric Radar

X波段雷达的强衰减一直是影响其探测精度及推广应用的主要问题,目的在寻找最优的衰减订正的方法,实现对X波段雷达数据的实时衰减订正。利用中国气象科学研究院的X波段双线偏振雷达,2016年5月在佛山南海外场试验取得的一批观测资料,对国内外已有的一些订正方法的效果进行分析检验。为检验订正效果,将同一时间的广州的S波段双偏振雷达数据作为标准,为更好地比较,将广州的S波段双偏振雷达数据进行坐标转换和插值处理,从而得到与佛山雷达数据相对应的仰角,方位角,距离库的反射率值,分析订正效果。选取一个径向的反射率值进行订正前后的数据定量分析,并且与坐标转换后的广州S波段雷达同一个径向的反射率值进行横向比较。主要选取ZH订正法、KDP订正法、"ZPHI"降水廓线订正算法进行分析对比。分析表明,KDP订正法、"ZPHI"订正法在订正效果上比较好,优于ZH订正法。

The main problem of X-band dual linear polarimetric radar for operational application is the strong attenuation.The purpose of this paper is to find the optimal attenuation correction method. Using the X-band dual linear polarimetric radar of Chinese Academy of Meteorological Sciences,Was used to obtain a set of observation data in the field experiment in Foshan in May 2016. We select three attenuation correction methods and make a comparison between the correction results. Meanwhile we use the simultaneous data of Guangzhou S-band dual linear polarimetric radar as the criterion. To achieve a better comparison,the data in Guangzhou was processed with coordinate conversion and interpolation processing. Then we obtain the S-band radar data with the same elevation,azimuth and range of X-band radar data in Foshan.Moreover,We choose a set of S X-band radar data of a radial for quantitative analysis. In this paper,we choose ZH method,KDPmethod and ZPHI method to correct the attenuation. The analysis results indicate that KDPmethod and ZPHI method have a better performance in correct results than ZHmethod.