提出了一种新的基于斜坡检测的激光雷达低空风切变预警算法,该算法将下滑道扫描与单双斜坡检测相结合。首先，把下滑道扫描方式下获取的激光雷达径向风速投影到下滑道上，进行数据重构。其次，对逆风风廓线进行单斜坡及双斜坡梯度变化的检测并以国际上规定的低空风切变阈值及风切变强度因子判别公式判断风切变。使用香港天文台实际激光雷达数据进行了实验验证，结果表明新方法能够检测出单斜坡未能检测出的风切变。该方法是有效的，对于提高风切变的预警率有重要意义。

A new lidar low-level wind shear alerting algorithm based on ramps detection was presented in this paper. Glide path scanning and combination of double and simple ramp detection had been applied in this new algorithm. Firstly, the lidar radial velocity was projected onto the glide-path and headwind wind profile was restricted into. Secondly, single ramps and the changes of double ramps declivity were detected by the new algorithm. The results on provisions of international low-level wind shear threshold and the wind shear alerting discriminating judgment formula was compared to come to the conclusion. The performance of the proposed method was verified through the real data from Hong Kong Observatory. The results show that the proposed algorithm detects the wind shear which the single ramp fails to detect. The new proposed method is effective, it is significant to raise the alarm rate.