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本文导出了大气后向散射信号光入射到Fabry-Perot(F-P)标准具的有效透过率表达式.在基于单F-P标准具的双频率多普勒激光雷达系统中,采用平均值法定量分析了瑞利后向散射信号对风场测量准确度的影响.提出了同时反演风速和后向散射比的非线性迭代方法,并通过仿真试验验证了该方法的有效性.同时,导出了径向风速和后向散射比测量误差的具体表达式,并据此进行了仿真.仿真结果表明:若假定望远镜接收到的总后向散射光子数为50000,径向风速测量误差随后向散射比的增大迅速减小,在±25 m/s的风速测量动态范围内,当Rβ>1.2时,误差小于3 m/s;后向散射比测量误差随后向散射比的增大而增大,与径向风速大小几乎无关,当Rβ<10时,相对误差小于13%.
In this paper, we derive the expression of effective transmission rate of atmospheric backscattering signal light incident on Fabry-Perot (FP) etalon.In the dual-frequency Doppler Lidar system based on single FP etalon, the mean value method The effect of Rayleigh backscatter signal on wind field measurement accuracy is analyzed. A nonlinear iterative method of simultaneously inverting wind speed and backscattering ratio is proposed, and the effectiveness of the method is verified by simulation experiments. At the same time, And the simulation results show that if the total number of backscattered photons received by the telescope is 50000, the error of radial wind speed measurement will be gradually increased to the scattering ratio The error is less than 3 m / s when Rβ> 1.2. The measurement error of backscattering ratio then increases with the increase of scattering ratio, which is in agreement with The radial wind speed is almost irrelevant, and the relative error is less than 13% when Rβ <10.