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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 structure of wind laser lidar based on Fizeau interferometer is introduced. Under the existing system parameters, the frequency range of the probe measurements and the Fizeau wedge angle were optimized and the resulting system error was less than 0.17 m / s at 3 km. Different data inversion methods are discussed. The Voigt fitting method was used to process the signals simulated by Monte-Carlo method for many times. The difference between wind speed and actual value was very small. The standard deviation was in accordance with the system error formula of least squares fitting method. It is feasible to use Voigt fitting method to invert wind speed, especially in the case of large wind speed. At 3 km, the presence of a blind spot of the detector at K = 0.1 will result in a measurement error of about 0.01 m / s.