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利用激光雷达进行风场检测,可以通过多普勒频移来获取径向速度矢量,对于单一的激光雷达测速系统测得的数据要进一步反演才能得到三维的风场信息。文中介绍了一种基于双边缘的直接探测激光雷达系统,采用圆锥扫描方式,对于获取的径向速度信息选取扫描圆锥的垂直截面上互相正交的四个点,在均匀风的假定下,利用空间几何的特性求出中心点的三维速度信息,并依据雷达系统对于径向速度的测量精度,综合考虑了角度和距离分辨率以及由观测坐标系到地面坐标系的变换对精度的影响,计算结果表明:反演的三维风矢量精度最差可达到2.8 m/s。
Using laser radar to detect the wind field, the radial velocity vector can be obtained by Doppler shift, and the 3D wind field information can be obtained by further inversion of the data measured by a single laser radar velocity system. In this paper, a double-edge direct detection lidar system is introduced. By using the conical scanning method, four points orthogonal to each other on the vertical section of the scanning cone are selected for the radial velocity information obtained. Under uniform wind assumption, According to the measurement accuracy of radar system for radial velocity, considering the angle and distance resolution and the effect of the transformation from observation coordinate system to ground coordinate system on the accuracy, the calculation of the three-dimensional velocity information of the center point is made The results show that the accuracy of 3D wind vector inversion can reach as low as 2.8 m / s.