基于激光雷达的斜坡改进风切变预警算法

Ramp-improved algorithm in low-levelwind shear alerting based on LiDAR

风切变是风矢量在水平或垂直方向发生改变的自然现象,严重危害飞行器的起飞和降落。针对现有F因子、单斜坡等风切变检测算法存在的虚警率过高或漏警问题,本文提出一种基于斜坡改进的激光雷达风切变预警算法,应用最大最小值代替传统算法的斜坡首尾风速差,并计算每个斜坡的能量变化,弥补了现有F因子算法虚警太高、斜坡算法会产生漏报的不足,为机场风切变预警能力的提升提供了有效解决途径。中国香港国际机场实测数据验证了算法的有效性与准确性,原始斜坡取400 m时斜坡改进算法最好,此时给出的风切变发生范围最精确,能为飞机安全起降提供有效的危害预警手段。

Wind shear is a natural phenomenon in which the wind vector changes in the horizontal or vertical direction,seriously jeopardizing the takeoff and landing phases of aircraft.In this paper,a ramp-improved algorithm in low-level wind shear alerting based on LiDAR is proposed to address the problem of high false alarm rate or missed alarms in existing F-factor,single slope and other wind shear detection algorithms.By applying the maximum-minimum values instead of the head-tail differences in the traditional algorithms and calculating the energy change of each ramp,the existing F-factor algorithm makes up for the deficiency that the false alarm is too high and the slope algorithm produces missed alarms,and provides an effective solution for improving the airport windshear early warning capability.The data measured at Hong Kong International Airport verifies the validity and accuracy of the algorithm.When the original ramp is 400 m,the ramp-improved algorithm performs best,which gives the most accurate wind shear occurrence range,and provides an effective hazard warning method for safe aircraft take-off and landing.