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Proceedings Paper

Coherent lidar imaging of dust clouds: waveform comparison with the poly-phase (P4) modulation waveform
Author(s): Douglas G. Youmans
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Paper Abstract

A dust or aerosol cloud represents a convenient target to examine the capabilities of range-resolved Doppler and intensity (RRDI) or inverse synthetic aperture ladar (ISAR) imaging coherent laser radar, known as coherent "lidar" for optically thin targets. The poly-phase P4 ladar waveform and its RRDI images are described and compared with previous pulse-burst, linear-FM chirp pulse-compression, pseudo-random phase modulation waveforms, and several other waveforms which have not been utilized to date. A "dust cloud" has very many independently moving point scatterers with velocities that are approximately Gaussian randomly distributed in x,y,z with standard deviations of about 10% of the mean wind + aerosol velocity. This is contrary to a hard-target where the point scatterers are rigidly attached and moving together. The dust cloud produced speckle effects for the various ladar waveforms are compared. In addition, a reference set of four corner-cube retro-reflectors within the dust cloud further illustrates the differences in the various waveform capabilities and resolution.

Paper Details

Date Published: 16 April 2008
PDF: 12 pages
Proc. SPIE 6950, Laser Radar Technology and Applications XIII, 695009 (16 April 2008); doi: 10.1117/12.778099
Show Author Affiliations
Douglas G. Youmans, SPARTA, Inc. (United States)

Published in SPIE Proceedings Vol. 6950:
Laser Radar Technology and Applications XIII
Monte D. Turner; Gary W. Kamerman, Editor(s)

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