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| 两种VAD算法的比较及其应用 | |
| 引用本文： | 万蓉,汤达章,张鹏,吴书君. 两种VAD算法的比较及其应用[J]. 南京气象学院学报, 2002, 25(5): 648-655 |
| 作者姓名： | 万蓉 汤达章 张鹏 吴书君 |
| 作者单位： | 1. 南京气象学院,大气科学系,江苏,南京,210044 2. 中国人民解放军理工大学,气象学院,江苏,南京,211101 3. 滨州市气象局,山东,滨州,256612 |
| 摘 要： | 针对多普勒雷达速度资料非全方位均匀采样情况，选取了两种速度方位显示（VAD）算法：函数展开的Thomas算法和复数展开的Rabin算法。对于含有二阶谐波的线性风场，Thomas算法较为适用；对于不含二阶谐波的线性风场，Rabin算法对采样范围要求更小，适用性更强。实际应用中，针对不同情况，各算法得到的平均风向风速值与全方位资料结果的相对误差不超过10％。 |
| 关 键 词： | VAD算法 二阶谐波 有效采样范围 多普勒速度 风向 风速 风场 雷达 |
| 文章编号： | 1000-2022(2002)05-0648-08 |
| 修稿时间： | 2001-11-26 |
Application and Comparison of Two VAD Methods of Doppler Radar |
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| WAN Rong ,TANG Da-zhang ,ZHANG Peng ,WU Shu-jun. Application and Comparison of Two VAD Methods of Doppler Radar[J]. Journal of Nanjing Institute of Meteorology, 2002, 25(5): 648-655 | |
| Authors: | WAN Rong TANG Da-zhang ZHANG Peng WU Shu-jun |
| Affiliation: | WAN Rong 1,TANG Da-zhang 1,ZHANG Peng 2,WU Shu-jun 3 |
| Abstract: | Thomas' and Rabin's Velocity-Azimuth Display(VAD) methods are chose and compared in this paper.Both of them can be applied to retrieve the subsynoptic-scale average wind speed and direction with the least square solution to the harmonics of the unequally sampled data field.Thomas' method is applicable to the linear wind field including the second harmonic.But,to the wind field only including zero and the first harmonic,Rabin's method needs the smaller effective sample area than Thomas'.We analyze the respective effective sample areas of two VAD methods and their errors.Computing results indicate that the relative errors of the retrieve values,such as average or full azimuth wind speed and direction,of the two VAD methods are within 10% in their respective effective areas. |
| Keywords: | VAD method second harmonic effective sample area |
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