星载激光测风雷达的光束扫描及风场反演

Beam Scanning and Inversion Method for Lidar Detecting Wind

激光测风雷达通过多普勒频移来确定激光束视线方向上的大气风场的速度矢量。由这些测得的矢量可反演大气风场群速的速度矢量。文讨论利用单一激光多普勒风速仪系统 ,激光束采用圆锥扫描方式 ,在扫描圆锥的垂直截面上取四个正交点上的多普勒风速矢量。通过这四个矢量 ,利用空间解析几何的知识 ,最终推导出观测视场上风场的水平和垂直方向的矢量分量。

Utilizing lidar to obtain the wind velocity along the line of sight by Doppler shift and then inverting these velocity vectors to real atmosphere wind group speed is a very important purpose of laser lidar. The technique of using a conical scanning manner known as velocity azimuth display based on single laser Doppler velocimetry (LDV) system is described. The horizontal and vertical wind sections of the observed field can be obtained by spatial analytic geometry operation and analysis based on the four orthogonal points vector which located on the scanning cone's vertical section. Then these vectors are inverted to the observed wind field.