机动型激光测风雷达倾斜风场修正算法研究

Correction method of tilt wind field of mobile wind lidar

为了解决激光测风雷达处于倾斜放置的情况下测出的风场信息与实际风场之间存在的误差,分析了激光雷达的测量原理、放置情况以及存在的问题,采用空间坐标变换的方法对雷达倾斜状态进行理论计算并给出了修正计算公式。对比了水平放置和横向倾斜7.2°放置的激光雷达的实测数据,发现修正前由于倾斜放置导致雷达所测垂直气流数据间产生的误差较大,加入修正算法进行仿真后,数据曲线吻合良好,修正效果明显。结果表明,空间坐标变换的修正算法可使激光雷达在处于非特定位置时仍能正确地反映实际风场信息,从而验证了该修正算法的正确性和可行性。

In order to correct the error between wind field information measured by a tilt lidar and the actual wind field,after analyzing the measurement principle,placement and exist problems of laser radar,theoretical calculation was carried out based on space coordinate transformation method and correction formula was put forward. After comparing the measured data of laser radar located at horizontal position and lateral tilt 7. 2°,it was found that the error of vertical airflow data measured by tilt lidar was larger. After modification,data curve is in good agreement with the modified algorithm. The results indicate that could get the real wind field information can be obtained correctly based on space coordinate transformation algorithm for tilt lidar.Correctness and feasibility of the algorithm are proved.