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为了分析背景辐射对基于氧气吸收被动测距精度的影响,利用高光谱成像光谱仪作为测量设备,卤钨灯作为目标,进行了实验研究.首先,介绍了基于氧气吸收被动测距技术的基本原理;接着,利用高光谱成像仪采集了夜间不同距离下的卤钨灯目标光谱分布,根据氧气吸收被动测距原理,计算了目标的氧气吸收率,建立了氧气吸收率与路径关系的模型;然后采集并计算了晴天2360 m处目标在不同时刻下的氧气吸收率分布,根据所建模型,利用白天测得的氧气吸收率数据解算距离并分析测距误差,最终获得背景辐射对被动测距误差的影响.结果表明:依据所建立的模型,白天测距误差最大6.74%,并且随着太阳高度角变小,所处背景变暗,误差逐渐变小,到夜间时最小相对误差仅1.10%,可达到较高测距精度.
In order to analyze the effect of background radiation on the accuracy of passive ranging based on oxygen absorption, the experimental research is carried out using hyperspectral imaging spectrometer as the measuring equipment and tungsten halogen lamp.Firstly, the basic principle of passive ranging based on oxygen absorption is introduced. Then, using the hyperspectral imager, the target spectral distribution of tungsten halogen lamp under different distances at night was collected. According to the passive measurement of oxygen absorption, the target’s oxygen absorption rate was calculated and the model of the relationship between the oxygen absorption rate and the path was established. The oxygen absorption rate distribution of the target at 2360 m in sunny day was calculated. According to the model, the distance and the distance error were calculated by using the oxygen absorption rate data measured in the daytime, and finally the relationship between the background radiation and the passive ranging error The results show that according to the established model, the maximum range error is 6.74% during the daytime, and the darker the background, the smaller the error is, the minimum relative error is only 1.10% Can achieve higher ranging accuracy.