激光光斑中心高精度定位算法研究

为提高测风激光雷达系统光学结构能量接收效率,需要对激光雷达系统中的激光光斑中心进行准确定位. 通过对常用亚像素定位算法的分析,利用高斯拟合和矩形区域来对灰度重心定位算法进行优化,提出了激光光斑定位的改进算法,并与已有的算法进行了对比分析,设计并开展了验证试验. 试验结果表明改进算法比已有传统算法对激光光斑的定位准确性大幅提高,最大限度地减小光斑形状的不对称所导致的误差,对于光能量分布中心的估计也更为准确,是一种切实可行的光斑中心定位算法. 

Research of the High Precision Laser Spot Center Location Algorithm

In order to increase the receiving efficiency of the Lidar wind measurement system, it is necessary to locate the laser spot center with high precision. Based on the analysis of commonly used algorithm, the centroid method was improved by using Gaussian fitting and a rectangular region. Having analyzed and compared the new algorithm with the existing algorithm, finally the averification system was designed and the experiment was carried out. Experimental results indicate that the standard deviation and positioning precision of the new algorithm is both superior to those of Gaussian fitting and centroid method, in addition, the new algorithm can minimize the error caused by asymmetrical spot shape.The comparison results of the accuracy of light energy distribution center show that the new algorithm is also better than Gaussian fitting method and centroid method, which proved the new algorithm is a feasible method for laser spot center location.