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钠多普勒激光雷达以75～110km大气层中的Na原子为示踪物,由接收到的共振荧光散射回波光子数反演该高度范围内大气温度、风场及钠原子数密度廓线。研究钠激光雷达大气风场和温度反演的方法,分析激光雷达光子计数中的脉冲堆积效应和钠层吸收对反演结果的影响,并提出改正方法。将该方法用于美国伊利诺斯大学激光雷达实测数据的反演,反演结果与该大学的结果相符合,验证了反演方法的正确性。最后对测量数据进行了误差分析,给出噪声光子数引起的误差剖面及实验测量精度。
Na Doppler lidar is a tracer in the atmosphere of 75-110 km, and the atmospheric temperature, wind field and sodium atom density profile are inverted by the number of received resonant fluorescence scattering echo photons. The method of atmospheric wind field and temperature inversion of sodium lidar was studied. The pulse accumulation effect in photon counting and the effect of sodium layer absorption on the inversion results were analyzed and the correction method was put forward. The method is applied to the inversion of the measured data of LIDAR in the University of Illinois. The inversion result is consistent with the university’s result, which verifies the correctness of the inversion method. Finally, the error of the measurement data is analyzed, and the error profile caused by the noise photon number and the experimental measurement accuracy are given.