高低空一体化测风激光雷达

高时空分辨率的大气风场探测对提高数值天气预报的准确性、大气动力学过程的研究、气候研究等具有很重要的意义。介绍了基于双Fabry-Perot标准具的直接接收激光多普勒测量原理。提出了40 km的高低空大气风场同时观测的技术方法。给出了利用大气气溶胶和分子散射信号的Mie-Rayleigh多普勒测风激光雷达的系统结构，并分析了工作波长、望远镜口径、扫描天顶角和标准具参数等激光雷达系统参数。研究了扫描角度误差、气溶胶后向散射信号、大气温度对风场探测精度的影响。分析了雷达系统的总体性能，得出在40 km高度处，当距离分辨率为500 m、时间分辨率为30 min时，水平风速探测精度优于6 m/s，可以满足有关应用的要求。

Doppler lidar for both high and low altitude wind detection

High-resolution wind observations are critical for improving the accuracy of numerical weather prediction, atmospheric dynamics and processes and climate studies. Principle of direct detection Doppler lidar based on dual Fabry-Perot etalon was introduced. The technique for measuring wind profile up to 40 km height was proposed, where both Mie and Rayleigh backscattering signals were simultaneously detected. The configuration of this Mie-Rayleigh Doppler wind lidar was described and the system parameters such as work wavelength, telescope aperture, scanning zenith angle, etalon parameter were analyzed. The effects of scanner uncertainty, the aerosol backscatter and atmospheric temperature on wind accuracy of the wind lidar were evaluated. The total performances of the lidar system were analyzed to get an accuracy of better than 6 m/s with 500 m range resolution and 30 min temporal resolution at 40 km altitude, which can meet the requirements of concerned applications.