用臭氧吸收特征校正红外测距中的反射辐射误差
Ozone Cues Mitigate Reflected Downwelling Radiance in LWIR Absorption-Based Ranging
- 通过臭氧和水汽吸收线的四波段测量估算反射辐射
- 四波段法误差降至6.8米，高光谱法更达1.2米
- 适合低热对比度场景的高精度红外测距
被动长波红外吸收测距依赖大气吸收来估算物体距离，基于其发射的热辐射。该方法最初用于远高于空气温度的目标，近年扩展至温差较小的场景，但一直假设反射辐射可忽略。下行辐射尤其造成显著误差。本文提出两种新方法：四波段法利用两个水汽吸收线和两个臭氧吸收线的窄带测量，给出闭式距离估计；高光谱法则扩展光谱范围，在提升精度的同时，还可估计温度、发射率分布及来自多个天顶角的下行辐射贡献。实验表明，当未建模反射光时误差超过100米，而四波段法降至6.8米，高光谱法仅1.2米。
原文摘要 · Abstract (English)
Passive long-wave infrared (LWIR) absorption-based ranging relies on atmospheric absorption to estimate distances to objects from their emitted thermal radiation. First demonstrated decades ago for objects much hotter than the air and recently extended to scenes with low temperature variations, this ranging has depended on reflected radiance being negligible. Downwelling radiance is especially problematic, sometimes causing large inaccuracies. In two new ranging methods, we use characteristic features from ozone absorption to estimate the contribution of reflected downwelling radiance. The quadspectral method gives a simple closed-form range estimate from four narrowband measurements, two at a water vapor absorption line and two at an ozone absorption line. The hyperspectral method uses a broader spectral range to improve accuracy while also providing estimates of temperature, emissivity profiles, and contributions of downwelling from a collection of zenith angles. Experimental results demonstrate improved ranging accuracy, in one case reducing error from over 100 m when reflected light is not modeled to 6.8 m with the quadspectral method and 1.2 m with the hyperspectral method.
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