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25 September 2007 Finding the range to a distant object near the sea surface
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Within the marine atmospheric surface layer it is possible for a single camera to deduce passively the range to a point target. Although this range determination would appear impossible at first glance, such a measurement exploits the common occurrence of sub-refractive propagation conditions in the marine environment. A calculation of the range to an object utilizes a geometric optics determination of slight angular differences between two different ray trajectories to the object. This is most commonly done with the assumption of Euclidean or 'free-space' conditions. In this paper we utilize the phenomenon of inferior mirages to provide two different ray-paths to an imaging sensor. The primary assumption is that the environment containing the path from camera (or eye) to target is homogeneous (but not isotropic).
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marianne A. C. Degache and Stephen Hammel "Finding the range to a distant object near the sea surface", Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 67080U (25 September 2007);

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