钠多普勒激光雷达大气参数反演方法

Retrieval method of atmospheric parameters for a Sodium Doppler Lidar

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。

The Sodium Doppler Lidar can be used to retrieve the atmospheric winds, temperatures and profile of photon number of Na atoms according to the received resonance fluorescence scattering photon echoes from the tracer of Na atoms in the Sodium layer from 75 km to 110 km altitudes. The retrieval method of lidar temperatures and winds was investigated. The influences of the pulse accumulated effects and Sodium layer absorptions on the retrieval results were analyzed, and their correction methods were given. The retrieval method was applied to process the measurement data of UIUC Na lidar. Results show good agreement with the winds and temperatures given by UIUC, which indicates the retrieval method is reliable. The measurement errors were analyzed.The error profiles due to photon noise and test accuracy were given.