悬空波导的激光雷达探测能力个例研究

A case study of lidar detection ability of elevated duct

以无线电探空仪实测的悬空波导为例,开展了激光雷达对其探测能力的仿真研究.通过振-转拉曼散射信号测量大气湿度,纯转动拉曼散射信号测量大气温度.再结合探空仪测量的大气压强,计算得到大气折射率.在拉曼激光雷达系统的四个探测通道中加入了泊松分布的信号起伏,以符合真实测量过程.仿真结果表明:对于较弱的悬空波导,中型激光雷达系统对其具有较好的捕获能力.基于蒙特卡洛方法研究了几种时空分辨率下激光雷达探测该悬空波导的辨识概率、波导层厚度及波导强度.

We have theoretically studied lidar detection ability of an elevated duct captured by radiosonde.The atmospheric humidity is measured through vibration-rotation Raman scattering signal,and the atmospheric temperature is measured through pure-rotational Raman scattering signal.Together with atmospheric pressure measured by radiosonde,the atmospheric refractive index can be calculated.Signal fluctuation with Poisson distribution is added in the four detection channels of raman lidar system,in order to accord with actual detection process.The emulation results indicate that,the medium-sized lidar possesses considerably good capture ability towards the weak elevated duct.In addition,the identification probability,layer thick and strength of elevated duct detected by lidar with different temporal and range resolutions are surveyed based on the MC method.