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6 August 1997 Laser radar in adverse weather
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey W. Grantham, C. D. Stargardt, Clifton Dungey, and Eduardo C. Meidunas "Laser radar in adverse weather", Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997);

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