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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%。
Proposed the use of lidar multi-elevation detection method to measure atmospheric visibility integrals. In this scheme, atmospheric optical thickness is used instead of the conventional atmospheric extinction coefficient to solve the slope visibility, which overcomes the shortcoming of poor visibility in the oblique range due to multiple scattering in low visibility and improves the detection accuracy. Landing provides a more accurate meteorological parameters. The Monte Carlo method is used to simulate the integral visibility measured by this method under three kinds of atmospheric extinction distribution. The results show that under the assumption of uniform distribution of atmospheric extinction in the laser detection area and the same vertical height, as long as the system parameters (such as laser pulse energy, integral cumulative time, bandwidth of narrowband filter, etc.) This method is feasible and the error of visibility detection does not exceed 4.3%.