【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 1 0 %。更多还原

【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.更多还原