为分析不同目标反射太阳光谱的特性,研究被动测距中抑制干扰目标的方法,利用高光谱成像光谱仪作为测量设备,200 W卤钨灯作为模拟探测目标,玻璃板、光滑铝板、塑料板作为干扰目标,对模拟目标发射光谱和干扰目标反射太阳光谱进行了实验采集与分析.实验采集了晴朗天气条件下干扰目标反射光谱及卤钨灯目标辐射光谱的信息,并对其氧气吸收率进行了计算,综合分析了镜面反射干扰目标、漫反射目标及背景反射光与卤钨灯发射光光谱的氧气吸收率差异,结果表明:在455 m处,镜面反射目标和漫反射目标反射光的氧气吸收率是卤钨灯的2~3倍.因此,在一定距离下可以利用氧气吸收率的差异设置阈值来对目标进行判别,提高探测概率.

In order to analyze the spectral characteristics of the reflected sun light by different targets,research the ways to reduce disturbance in passive ranging,using spectrometer as measuring equipment,200 W tungsten halogen lamp as simulated target,glass plate,aluminum plate and plastic plate as interference target,the spectrum of simulated target and the spectra reflected by interference target are acquired and analyzed.In the experiment,the reflected spectrum of interference target and the radiation spectrum of tungsten halogen lamp are acquired,and oxygen absorption is calculated.The difference of oxygen absorption between mirror reflection interference target,diffuse reflection target,the reflection of background and tungsten halogen lamp is analyzed.The result shows that:at 455 m,the oxygen absorption of reflection of mirror target and diffuse reflection target is twice to triple of tungsten halogen lamp.Hence,at a certain distance,the difference of oxygen absorption can be used as a threshold to distinguish targets,and improve detection probability.