一个新的氧吸收法被动测距公式

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。

Abstract

The oxygen A-band passive ranging has become one of the most active research topics in the area of mono-station passive distance estimation. However, the maximum estimating distance with acceptable errors is limited by the saturated zone in oxygen absorption curve. Calculation of the spectral transmittance with Modtran at 1 cm–1 resolution is performed, and through data modeling, a passive ranging formula of zenith angle and average absorption is obtained. This formula avoids saturated zone in the oxygen absorption curve, it makes the effective distance estimation range up to 50 km. In addition, the formula is not sensitive to absorption measurement error. For example, a zero-altitude sensor with a minimum detectable absorbance of Aˉ= 10-2 yields an approximate range error of not exceeding 50 m. The conclusion is expected to break through current situation of passive ranging based on oxygen absorption at short-range, and promote its practical application.

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