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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。
The influences of various influencing factors on the system error of Rayleigh scattering Doppler wind lidar are systematically analyzed. It is determined that the calibration accuracy of the transmittance curve plays a major role in the measurement error of the system. At the same time, the laser frequency locking error, gas Influence of Sol - Gel and Atmospheric Temperature Estimation Errors on System Measurement Errors. The experimental results show that when the temperature and the backscattering ratio are the same, the system error caused by the difference of the calibration parameters is more than 10 times higher than the theoretical value. When the backscattering ratio is the same, the system error increases with the temperature estimation error and the Doppler frequency The estimated error of atmospheric temperature is 5 K. The error of radial velocity measurement caused by calibration error varies with altitude and Doppler frequency, reaching a peak at 18 km and the maximum is 1.4 m / s.