中国激光, 2015, 42 (6): 0613002, 网络出版: 2022-09-23
冬季极端天气条件下被动测距实验
Experimental Research of Passive Ranging in Extreme Winter Weather
大气光学 被动测距 氧气吸收率 相关K 分布 极端天气 atmospheric optics passive ranging oxygen absorption correlated-K distribution extreme weather
摘要
氧气吸收率是利用氧气A 吸收带进行被动测距技术计算的核心,为研究冬季极端天气条件对目标氧气吸收率计算及测距精度的影响,在降雪和雾霾天气条件下进行了被动测距实验。采用1000 W 卤钨灯作为目标光源,分辨率为1 nm 的高光谱成像仪作为测量设备,对水平方向距离550 m 处的卤钨灯进行了测距实验。利用相关K 分布法建立的氧气吸收率与路径的关系模型及实验测得的目标氧气吸收率,解算了目标距离。结果表明:冬季极端天气影响目标氧气吸收率的测量精度,导致利用所建模型解算的距离与真实距离误差大;通过背景消除后,测距误差变小,雾霾天气测距误差为8.36%,降雪天气测距误差为5.45%。背景消除可以提高目标氧气吸收率的测量精度,进而提高冬季极端天气条件下的测距精度。
Abstract
Oxygen absorption rate is the core of passive ranging technology calculation using oxygen A band. In order to ascertain the influence of extreme winter weather on the calculation of oxygen spectral absorption and the accuracy of passive ranging, the passive ranging technology is investigated under the conditions of snowing weather and fog and haze weather. The source is a 1000 W tungsten halogen lamp, and the measuring device is a grating spectrometer with 1 nm resolution. The test data are processed at the range of 550 m. According to the mathematic model of oxygen absorption rate and path length using the correlated-K distribution, the distance is solved by the oxygen absorption rate of tungsten halogen lamp in extreme winter weather. The results indicate that the measurement accuracy of oxygen spectral absorption is affected by extreme winter weather, so the ranging error is great in extreme winter weather; but after removing background, the ranging error is reduced to 8.36% in fog and haze weather and 5.45% in snowing weather. By using background elimination method, the measurement accuracy of oxygen spectral absorption and the ranging precision can be increased in extreme winter weather.
张瑜, 刘秉琦, 华文深, 闫宗群, 李晓明, 刘远. 冬季极端天气条件下被动测距实验[J]. 中国激光, 2015, 42(6): 0613002. Zhang Yu, Liu Bingqi, Hua Wenshen, Yan Zongqun, Li Xiaoming, Liu Yuan. Experimental Research of Passive Ranging in Extreme Winter Weather[J]. Chinese Journal of Lasers, 2015, 42(6): 0613002.