高光谱分辨率激光雷达同时测量大气风和气溶胶光学性质的模拟研究

提出一套高光谱分辨率激光雷达(HSRL)系统,用于同时测量大气风和气溶胶的光学性质.该HSRL系统中使用碘分子滤波器分离分子和气溶胶后向散射,同时利用双边缘检测技术测量大气风场引起的多普勒频移.文中选用合理的HSRL参数和大气模型数据,模拟和分析了HSRL的测量性能.系统夜晚运行时,可测量20 km以下的大气风速和气溶胶,风速误差小于2 m s-1,气溶胶的后向散射系数相对误差小于30%.在白天工作时,相同误差下的可探测高度为10 km.模拟分析结果表明,该HSRL雷达有较大的应用前景,对天气和气象研究等有重要意义.

A Simulation of Simultaneously Measuring Wind and Aerosol Optical Properties Using High Spectral Resolution Lidar

A high spectral resolution lidar (HSRL) system which is capable of measuring aerosol backscattering and line-of-sight wind velocity from the troposphere to the stratosphere is proposed. An iodine vapor filer is used to separate the Mie and Rayleigh scattering components, as well as to discriminate the Doppler shift frequency by using double edge technique. The performances of the lidar system are simulated with reasonable parameters and atmospheric model. The error of line-of-sight wind velocity below an altitude of 20 km is smaller than 2 m s -1, and the error of the aerosol backscattering coefficients is smaller than 30% if HSRL is employed in the night. In the daytime, the lidar system can remotely sense wind velocity and aerosol backscattering coefficients within an altitude of 10 km with the same accuracy. This system has a good potential for the study of climate and meteorology.