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3 May 2010 Passive ranging using mid-wavelength infrared atmospheric attenuation
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Methods of estimating range to an emissive target based on the depth of an atmospheric absorption band are presented. The present work uses measurements of the CO2 absorption band centered at 2.0 μm where signal-to-background ratios are maximum for many applications. Observed spectra are compared to model spectra to estimate range. Spectral regions with minimal attenuation are used to estimate source parameters in order to isolate atmospheric transmission. The spectra of 21 high explosive events were used to test this technique. A simple technique treating the fireball as a blackbody consistently underestimated true range by approximately 13%. A more realistic source model using some order-of-magnitude assumptions of fireball composition reduces range error to 3%. The technique produces accurate results without requiring detailed knowledge of source parameters or atmospheric conditions.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Douglas James Macdonald, Michael R. Hawks, and Kevin C. Gross "Passive ranging using mid-wavelength infrared atmospheric attenuation", Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 766041 (3 May 2010);

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