Abstract: An optical flow method instead of the cross correlation method is proposed for convective precipitation system Compared with the simple algorithm of the cross correlation method, the optical flow method utilizes partial differential equations to compute the optical flow field, and uses strict constraints to get a smooth optical flow field The results show that the optical flow is superior to the cross correlation method for convective precipitation systems which evolve fast

Key words: Doppler radar, cross correlation, optical flow, nowcasting, severe weather warning

摘要： 针对强对流降水的情况，提出了使用光流法计算得到的光流场来代替交叉相关法得到的运动矢量场。与简单的交叉相关法相比，光流法从偏微分方程的角度来求解光流场，在计算过程中使用了严格的约束条件，运用递归法进行求解。试验及评价的结果表明，对变化较快的强对流降水天气过程，光流法明显优于交叉相关法。

关键词: 多普勒雷达, 交叉相关法, 光流法, 临近预报, 强天气预警