CAJ | 학술논문

在拉曼(Raman)激光雷达探测CO2实验中所采集的拉曼回波信号具有比较大的统计误差,有效减小统计误差,获得较高的探测精度是非常重要的工作.利用自适应滤波器对拉曼回波信号分段进行数据处理,可得到在分段的各个空间间隔内的随距离几乎不变的CO2混合比统计误差,经过自适应滤波器对信号进行处理后,Raman激光雷达对合肥地区夜晚CO2气体浓度探测达到比较高的测量精度,在1.5～5 km高度范围内,CO2浓度统计误差最大为2.5%,5～8 km统计误差最大为5%,8～10 km统计误差最大为10%.利用此技术也可以量化估计在较高的空间分辨率下满足探测精度要求的激光脉冲数.
재랍만(Raman)격광뢰체탐측CO2실험중소채집적랍만회파신호구유비교대적통계오차,유효감소통계오차,획득교고적탐측정도시비상중요적공작.이용자괄응려파기대랍만회파신호분단진행수거처리,가득도재분단적각개공간간격내적수거리궤호불변적CO2혼합비통계오차,경과자괄응려파기대신호진행처리후,Raman격광뢰체대합비지구야만CO2기체농도탐측체도비교고적측량정도,재1.5～5 km고도범위내,CO2농도통계오차최대위2.5%,5～8 km통계오차최대위5%,8～10 km통계오차최대위10%.이용차기술야가이양화고계재교고적공간분변솔하만족탐측정도요구적격광맥충수.
It is important to decrease the statistical error for improving the measurement precision of Raman lidar for the large statistical error of the Raman backscattering signals. An adaptive filter signal processing technique is applied to the Raman lidar for atmospheric CO2 measurement by subsection, and the result of the statistical error of the atmospheric CO2 mixing ratio changes little with detecting range in each subsection. After signal processing by the technique, we obtained the high precision of Raman lidar measurement of atmospheric CO2 concentration at night in Hefei. The maximum statistical error of atmospheric CO2 concentration was 2.5 % from 1.5 to 5 km, 5 % form 5 to 8 km, and 10% from 8 to 10 km. The technique also can be used to determine the number of laser shots necessary for a desired statistical accuracy and spatial resolution.