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自行研制了一台基于双边缘技术的多普勒激光雷达,用于测量对流层大气风场。该雷达采用具有高光谱分辨率的双Fabry-Perot干涉仪来检测气溶胶后向散射的多普勒频移量。给出了多普勒测风激光雷达的结构和参数。利用干涉仪参数讨论了雷达系统的测量精度。实验测定了双干涉仪的频谱曲线。通过计算和分析,由测量的干涉仪频谱曲线的的标准偏差引起的系统测量误差为0.5 m/s。系统的测量误差随着测量的高度和所测速度的增加在增大,在高度10 km测量50 m/s的风速时系统的测量误差小于2 m/s。
A Doppler lidar based on double-edge technology has been developed to measure the tropospheric wind field. The radar uses a dual Fabry-Perot interferometer with high spectral resolution to detect the amount of Doppler shift in the aerosol backscatter. The structure and parameters of Doppler wind lidar are given. The interferometer parameters are used to discuss the measurement accuracy of the radar system. The experiment measured the spectrum curve of double interferometer. Through calculation and analysis, the systematic measurement error caused by the standard deviation of the measured interferometer spectral curve is 0.5 m / s. The measurement error of the system increases with the height of the measurement and the measured speed, and the measurement error of the system is less than 2 m / s when the wind speed of 50 m / s is measured at a height of 10 km.