双线偏振多普勒雷达测量精度的理论分析

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

1.
北京市气象局北京 100089
2.
中国气象科学研究院北京 100081
3.
北京敏视达雷达有限公司北京 100085

资助项目:

国家重点基础研究发展规划项目“中国暴雨实验研究” G1998040909

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出版历程
- 收稿日期: 2001-09-05
- 修回日期: 2002-01-09
- 刊出日期: 2003-02-28

Theoretical Analysis of Measurement Accurency of Dual Linear Polarization Doppler Radar

1.
Beijing Meteorological Bureau , Beijing 100089
2.
Chinese Academy of Meteorological Sciences , Beijing 100081
3.
Beijing Metstar Radar Company , Limited , Beijing 100085

摘要

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K_DP都可以用来反演降雨强度，而K_DP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K_DP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K_DP测量精度达到0.1°/km。
- 双线偏振雷达;
- 差传播相移ΦDP;
- 差相移率常数KDP;
- 测量精度
Abstract: Measuring rainfall quantitatively is one of the main purposes of dual-linear polarization radar. The rain intensity can be derived from reflectivity Z_H, differential reflectivity Z_DR and specific differential phase K_DP. The measurement accuracy of K_DP is very important for deducing rainfall. The measurement accuracy of differential propagation phase shift Φ_DP is calculated with various sample pairs M, range average intervals and spectrum widths σ_V by using theoretical formula. Then, the effect of those factors on the measurement errors of Φ_DP is analyzed. Those results show that standard errors of Φ_DP gradually decrease when the number of sample pairs M or range average interval increase, but standard errorsΦ_DP gradually increase withσ_V increasing (except in the case of σ_V=1 m/s). Moreover, three methods of obtaining K_DP from Φ_DP are summarized and the accuracy of those methods is compared. These results show that the errors of K_DP produced by the second method are very large; the standard error of K_DP can be less than 0.1o/km when using the first method and the third method on some conditions.
- Dual Linear polarization radar;
- Differential propagation phase shift;
- Specific differential phase KDP;
- Measurement accuracy

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图 1 σ_{Φ_DP}与谱宽以及样本对数的关系

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表 1 不同的距离平均区间对σ_{Φ_DP}的影响

表 2 方法一和方法二计算K_DP时产生的测量误差

表 3 方法三计算K_DP时产生的测量误差

参考文献(10)

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