| 双线偏振多普勒雷达测量精度的理论分析 |
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| 引用本文： | 丁青兰,刘黎平,葛润生,徐宝祥.双线偏振多普勒雷达测量精度的理论分析[J].应用气象学报,2003,14(1):30-38. |
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| 作者姓名： | 丁青兰 刘黎平 葛润生 徐宝祥 |
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| 作者单位： | 1.北京市气象局 北京 100089 |
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| 基金项目： | 国家重点基础研究发展规划项目“中国暴雨实验研究”G1 9980 40 90 9资助 |
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| 摘 要： | 双线偏振雷达的主要任务之一是定量测量降水，反射率因子ZH、差反射率因子ZDR、差相移率常数KDP都可以用来反演降雨强度，而KDP的测量误差大小是影响反演降雨强度效果的关键。本文从理论公式出发，计算和分析了不同方位平均、距离平均、不同谱宽σV等因素对差传播相移ΦDP测量精度的影响。理论计算结果表明:ΦDP的测量误差随着样本对数M、距离平均区间的增大而减小，随σV的增大而增大(σV=1 m/s时例外)，此外，还总结了3种由ΦDP计算KDP的方法，并对这3种方法的测量误差进行了比较，发现方法二的测量误差很大，方法一和方法三在一定的条件下都能使KDP测量精度达到0.1°/km。
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| 关 键 词： | 双线偏振雷达 差传播相移ΦDP 差相移率常数KDP 测量精度 |
| 收稿时间： | 2001-09-05 |
| 修稿时间： | 2001年9月5日 |
Theoretical Analysis of Measurement Accurency of Dual Linear Polarization Doppler Radar |
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| Ding Qinglan,Liu Liping,Ge Runsheng,Xu Baoxiang.Theoretical Analysis of Measurement Accurency of Dual Linear Polarization Doppler Radar[J].Quarterly Journal of Applied Meteorology,2003,14(1):30-38. |
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| Authors: | Ding Qinglan Liu Liping Ge Runsheng Xu Baoxiang |
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| Affiliation: | 1.Beijing Meteorological Bureau , Beijing 1000892.Chinese Academy of Meteorological Sciences , Beijing 1000813.Beijing Metstar Radar Company , Limited , Beijing 100085 |
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| Abstract: | Measuring rainfall quantitatively is one of the main purposes of dual-linear polarization radar. The rain intensity can be derived from reflectivity ZH, differential reflectivity ZDR and specific differential phase KDP. The measurement accuracy of KDP is very important for deducing rainfall. The measurement accuracy of differential propagation phase shift ΦDP is calculated with various sample pairs M, range average intervals and spectrum widths σV by using theoretical formula. Then, the effect of those factors on the measurement errors of ΦDP is analyzed. Those results show that standard errors of ΦDP gradually decrease when the number of sample pairs M or range average interval increase, but standard errorsΦDP gradually increase withσV increasing (except in the case of σV=1 m/s). Moreover, three methods of obtaining KDP from ΦDP are summarized and the accuracy of those methods is compared. These results show that the errors of KDP produced by the second method are very large; the standard error of KDP can be less than 0.1o/km when using the first method and the third method on some conditions. |
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| Keywords: | Dual linear polarization radar Differential propagation phase shift Specific differential phase K DP Measurement accuracy |
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