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Proceedings Paper

Slant path 1.5 µm range gated imaging close to ground
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Paper Abstract

This paper will report experiments, analysis and simulations of slant path imaging using 1.5 μm gated imaging. The measurements were taking place at a former airfield along a 2 km path. The sensor was elevated by a lift in steps from 2-12.5 meters. Targets were resolution charts. The turbulence was measured along the path with a scintillometer. Turbulence information was also obtained at various path positions including the elevated cage using anemometers. The camera was collecting both passive and active images in the SWIR region. In the passive mode (using solar illumination) the noise due to speckles are eliminated and the influence by scintillation limited. In the active mode on the other hand these noise sources are present to a varying degree depending on stabilized frame averaging and on the sensor elevation. A trend is that the image quality is improved for elevated sensor positions. Two light sources in the camera FOV (head lights from a car) gave independent turbulence level estimates. The paper will present evaluated images for both passive and active modes obtained at different elevations and the result will be compared with theory including image simulation.

Paper Details

Date Published: 10 May 2011
PDF: 21 pages
Proc. SPIE 8037, Laser Radar Technology and Applications XVI, 803703 (10 May 2011); doi: 10.1117/12.883364
Show Author Affiliations
Ove Steinvall, Swedish Defence Research Agency (Sweden)
Magnus Elmqvist, Swedish Defence Research Agency (Sweden)
Kjell Karlsson, Swedish Defence Research Agency (Sweden)
Ove Gustafsson, Swedish Defence Research Agency (Sweden)
Tomas Chevalier, Swedish Defence Research Agency (Sweden)

Published in SPIE Proceedings Vol. 8037:
Laser Radar Technology and Applications XVI
Monte D. Turner; Gary W. Kamerman, Editor(s)

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