Finding the range to a distant object near the sea surface
| Autor: | M.A.C. Degache, Stephen M. Hammel |
|---|---|
| Přispěvatelé: | TNO Defensie en Veiligheid |
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Hammel, S.M.Eijk,A.M.J. vanValley, T.Vorontsov, M.A., Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 27 September 2007, San Diego, CA, USA |
| ISSN: | 0277-786X |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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