菲佐测风激光雷达及风速反演算法

Fizeau wind lidar and wind inversion algorithms

研制了基于菲佐干涉仪的测风激光雷达系统,并使用高斯拟合法和最大似然法反演风速,对两种风速反演方法进行了分析,结果表明:风速较小时,两种方法具有相似的风速反演精度,但高斯拟合法收敛快、受条纹信噪比影响较小;风速较大时,高斯拟合法会由于条纹移出而产生较大误差,而最大似然法在处理风速较大情况时具有优势。实际风速测量时,应根据风速估计值的大小,采用两种方法分别处理大风速和小风速时的情况。最后,使用研制的测风激光雷达系统和风速反演算法,得到了1.5 km以内的大气风速廓线。

Wind lidar based on Fizeau interferometer is developed, two wind inversion algorithms are presented as well. The two wind inversion algorithms are analyzed respectively, the results show： when the wind is slow, the two algorithms have the same precision, but Gaussian fitting method has faster convergence and less effect from signal noise ratio of the fringe than maximum likelihood method; when the wind is fast, the Gaussian fitting method will cause large wind error because part of the fringe doesn＇t illuminate the detector, the maximum likelihood method is preferred in this case. Hence the two algorithms are used to invert the wind speed respectively according to the estimated wind speed. Using the lidar system and the wind inversion algorithms, wind speed profile at altitudes below 1.5 km is obtained.