瑞利散射多普勒测风激光雷达系统误差分析

系统全面地分析了各种影响因素对瑞利散射多普勒测风激光雷达系统误差的影响,确定了透过率曲线校准精度对系统测量误差起主要作用,同时必须考虑激光频率锁定误差、气溶胶及大气温度估计误差对系统测量误差的影响.实验结果表明:温度和后向散射比相同时,由校准参数差异引起的系统误差比理论值增加10倍以上;后向散射比相同时,系统误差随温度估计误差和多普勒频率增大而增大;大气温度估计误差5 K,校准误差产生的径向速度测量误差随高度和多普勒频率变化,在18 km左右达到峰值,最大值1.4 m/s

Analysis of system accuracy for Rayleigh backscattering Doppler wind lidar

All factors affecting the system error were comprehensive taken into account for Rayleigh Doppler wind lidar in this paper. The calibration accuracy of the transmission curve parameters of the three-channel Fabry-Perot etalon contributes mostly effect to the system error, and the tracking accuracy of laser frequency, aerosol and the estimation error of atmosphere temperature contributing to the system error must be taken into account simultaneously. Experiment results demonstrate that the system error calculated by the calibration parameters error is 10 times bigger than it calculated by the design parameters when the atmosphere temperature and the backscattering ratio are unchanged. The system error increases with the estimation error of atmosphere temperature and the Doppler frequency when the backscattering ratio is constant. The system error produced by the calculation accuracy of the transmission parameters increase with the altitude and the Doppler shift with local maximum value 1.4 m/s at 18 km altitude.