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Proceedings Paper

Laser radar in adverse weather
Author(s): Jeffrey W. Grantham; C. D. Stargardt; Clifton Dungey; Eduardo C. Meidunas
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Paper Abstract

Laser radar image of an outdoor target scene were collected in adverse weather such as rain and fog during the course of one year. Included in this collection is imagery in fogs with visibilities less than 0.2 km and rains with rain rates of up to 180 mm/hr. The targets were small buildings, target panels and a mobile target, all approximately 500 m in distance from the laser radar system. The laser radar system used was a direct-detection 1.06 micrometers system designed to operate at 1 km in clear weather. Using these collected images, dropout pixels and false returns were correlated with rain rate and visibility. Dropouts and false returns were found to follow a linear relationship with rain rate and an exponential decreasing relationship with visibility. Empirical equations were developed from least square fits of the data to predict the dropouts and false returns, given the rain rate and visibility. Finally, fog and rain data from 450 images was combined and correlated into visibility intervals so that one can predict the dropout and false return percentages given a visibility in either fig or rain.

Paper Details

Date Published: 6 August 1997
PDF: 10 pages
Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997); doi: 10.1117/12.280999
Show Author Affiliations
Jeffrey W. Grantham, Air Force Research Lab. (United States)
C. D. Stargardt, Air Force Institute of Technology (United States)
Clifton Dungey, Air Force Institute of Technology (United States)
Eduardo C. Meidunas, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 3065:
Laser Radar Technology and Applications II
Gary W. Kamerman, Editor(s)

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