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基于氧气A吸收带的被动测距技术已成为单站被动测距领域最具活力的研究课题之一,但是由于氧气吸收饱和区的存在,限制了被动测距的最大可达范围。采用具有1 cm–1分辨率的Modtran软件进行了分光谱透射率计算,通过数据建模获得了基于目标天顶角和平均氧气吸收率的被动测距公式。该公式避免了氧气吸收率曲线的饱和区,使得氧吸收法的有效距离估计范围可延伸到50 km。此外,该公式还有对吸收率测量误差不敏感的特性,例如,在零海拔处传感器最小可检测的吸收率Aˉ=10-2的偏差,所能产生的距离偏差不超过50 m。该结论有望突破绝大多数氧吸收法被动测距实验局限于较近距离的现状,促进其实际应用。
Passive ranging technology based on the absorption band of oxygen A has become one of the most dynamic research topics in the field of single-station passive ranging. However, due to the existence of saturated oxygen absorption zone, the maximum range of passive ranging is limited. Spectral transmittance calculations were performed using Modtran software with a resolution of 1 cm-1. Passive ranging formulas based on the target zenith angle and the average oxygen uptake were obtained through data modeling. This formula avoids the saturation region of the oxygen absorption rate curve so that the effective range of the oxygen absorption method can be estimated to extend to 50 km. In addition, the formula is also insensitive to measurement errors in absorbance. For example, the smallest detectable absorbance A ˉ = 10 -2 for sensors at zero elevations can produce a distance deviation of no more than 50 m. The conclusion is expected to break through the vast majority of passive oxygen measurement method passive confined to the more limited the status quo, and promote their practical application.