激光雷达斜程能见度的一种探测方法及其分析

提出利用激光雷达多仰角探测方法对大气斜程积分能见度测量的方案.该方案以大气光学厚度替代传统的利用大气消光系数分布求解斜程能见度,从而克服了在低能见度下,由于大气多次散射,斜程能见度难以测准的缺点,提高了探测精度,为飞机起飞着陆提供了较为准确的气象参数.利用Monte-Carlo方法模拟计算了3种大气消光分布情况下采用该方法测量的积分能见度.结果表明：在激光探测区域内和垂直高度相同的大气消光分布均匀的假设条件下,只要在设计激光雷达时,恰当选择系统参数（如激光脉冲能量、积分累计时间、窄带滤光片带宽等）使得信噪比满足一定的条件,该方法是可行的,且能见度探测误差不超过4.3%.

Detective method and analysis of atmospheric slant visibility for lidar

A new detection method taking advantage of multi-elevation angles with lidar is presented for measuring atmospheric slant integral visibility. In this method, the extinction coefficient was replaced by optical depth in order to solve slant visibility. This method overcomes the defect wherein values of slant visibility are hard to detect precisely because of multi-scatter of atmosphere under low-visibility .The method also improves the precision of meteorological parameters for the take flying-off and landing of airplanes. Moreover, the Monte-Carlo method was used to simulate integral visibility measured by the above method on the three different conditions of atmospheric extinct distribution. The results show that if appropriate system parameters, such as laser pulse energy, integral accumulated time, narrowband light filter bandwith, etc., are selected for a satisfactory signal-to-noise ratio, this method is valid and the error is less than 4.3%, providing the lidar is designed in the field of laser exploration as well as homogeneous atmospheric extinct distribution.