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基于建立的车载直接探测激光雷达系统,对接收光学鉴频器进行了研究。针对边界层、对流层和平流层不同的气溶胶和大气分子浓度以及风速动态范围,同时采用直接探测的两种主要技术。利用多光束菲索(Fizeau)干涉仪(MFI)和阵列光电倍增管(PMT),接收气溶胶散射信号,获得边界层风速。采用双法布里-珀罗(Fabry-Perot)干涉仪(DFP)和光电倍增管探测器,分析分子散射信号,得到对流层风场。使用实际的激光雷达系统参数和大气模型参数,对两个鉴频器进行了优化设计,分析了它们的风速测量灵敏度和精度。多光束菲索干涉仪鉴频器系统在±50 m/s风速范围内测量灵敏度为1.3%/(m.s-1),高度分辨率为200 m,边界层内风速测量误差小于1 m/s。双法布里-珀罗干涉仪鉴频器系统在±100 m/s风速范围内的测量灵敏度约为0.3%/(m.s-1),高度分辨率为1000 m,对流层风速测量误差小于3 m/s。
Based on the built-in direct detection laser radar system, the optical frequency discriminator was studied. For the boundary layer, troposphere and stratosphere different aerosol and atmospheric molecular concentrations and dynamic range of wind speed, while the direct detection of the two main techniques. Aerosol scattering signals were received using a multi-beam Fizeau interferometer (MFI) and an array photomultiplier tube (PMT) to obtain the boundary layer wind speed. Using the Fabry-Perot interferometer (DFP) and photomultiplier tube detector, the molecular scattering signal was analyzed to obtain the troposphere wind field. Using the actual Lidar system parameters and atmospheric model parameters, two frequency discriminators were optimized and the sensitivity and accuracy of wind speed measurement were analyzed. The multi-beam FESO frequency discriminator system has a measurement sensitivity of 1.3% / (m.s-1) at a wind speed of ± 50 m / s and a height resolution of 200 m. The wind speed measurement error in the boundary layer is less than 1 m / s. The dual Fabry-Perot interferometer frequency discriminator system has a measurement sensitivity of about 0.3% / (ms-1) over a wind speed range of ± 100 m / s, a resolution of 1000 m for the altitude resolution, and an error of less than 3 m for tropospheric wind speed / s.