对基于Fizeau干涉仪的测风激光雷达的研究

Wind lidar based on Fizeau interferometer

介绍了基于Fizeau干涉仪测风激光雷达的系统结构。在已有的系统参数下,对探测器测量的频率范围和Fizeau楔角作了优化,得出的系统误差在3 km处小于0.17 m/s。讨论了不同的数据反演方法。采用Voigt拟合法对用Monte-Carlo方法模拟的信号进行了多次处理,反演出的风速和实际值相差很小,标准偏差和用最小二乘拟合方法的系统误差公式值相符。表明用Voigt拟合方法反演风速是可行的,尤其在大风速情况下,其优势明显。在3 km处,当K=0.1时,探测器的盲区存在将产生约0.01 m/s的测量误差。

The system of wind lidar based on Fizeau interferometer is introduced. Frequency range of detector measuring and Fizeau wedge angle are optimized. At altitude of 3 km, the system error of radial wind is below 0.17 m/s. Several data processing methods are discussed. Voigt fitting method is used to deal with signal perturbed with random noise simulated by Mont-Carlo technique .The calculated error is small and the standard deviation agrees well with the value calculated by the formula of system error for least square fitting. The result shows that the use of Voigt fitting method to retrieve wind is feasible, its advantage is obvious especially when wind velocity is large. When K=0.1, the wind error due to dead space of detector is about 0.01 m/s at altitude of 3 km.