60km车载瑞利测风激光雷达研制

Development of 60 km mobile Rayleigh wind lidar

目前我国尚缺乏25~60 km大气风场实时探测手段,为此研制了60 km车载瑞利测风激光雷达。介绍了系统总体结构,对分系统的研制做了详细描述。为提高风场反演的精度,设计了标准具通过率函数校准系统。提出了标准具通过率函数校准方法,并开展实验对标准具通过率函数进行了校准。校准结果表明,接收机性能稳定,各参数测量标准差均小于0.06。该系统在德令哈地区对15~60 km大气风场进行了观测,获得了水平风场的测量结果,并与当地探空气球的探测结果进行了比对,30 km以下一致性较好。对风速、风向测量误差进行了计算,40 km以下,风速测量误差≤4 m/s,风向测量误差≤6°,40 km以上,风速测量误差≤8 m/s,风向测量误差≤18°。该系统设计合理,性能稳定,能够实时探测10~60 km大气风场。

Recently, the wind field in the altitude range 25-60 km is still poorly monitored in real time, therefore the 60 km mobile Rayleigh wind lidar based on a Fabry-Perot etalon was developed for wind measurement. The overall structure of this lidar system was described in detail. The design of the subsystems of this lidar was indroduced elaborately. In order to improve the accuracy of wind measurement, experiment was designed to calibrate the transmission curves of FPI, and the calibration method was presented. The transmission curves of FPI were calibrated experimentally, and the standard deviations for parameters of FPI are less than 0.06 in the calibrated experiments. The developed lidar has observed the wind of 15-60 km altitudes over Delingha, and wind velocity and direction profiles were obtained. Observations of lidar werecompared with the rawinsondes’, and the compared result show good agreement between both measurements. Measure error was calculated, wind velocity and direction errors of the measurements are less than 4 m/s and 6o respectively when it is lower than 40 km. They are less than 8 m/s and 18o when it is higher than 40 km. Wind observations demonstrate that the lidar has the expected good performances.