Document Detail


Synthetic-aperture imaging laser radar: laboratory demonstration and signal processing.
MedLine Citation:
PMID:  16363787     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The spatial resolution of a conventional imaging laser radar system is constrained by the diffraction limit of the telescope's aperture. We investigate a technique known as synthetic-aperture imaging laser radar (SAIL), which employs aperture synthesis with coherent laser radar to overcome the diffraction limit and achieve fine-resolution, long-range, two-dimensional imaging with modest aperture diameters. We detail our laboratory-scale SAIL testbed, digital signal-processing techniques, and image results. In particular, we report what we believe to be the first optical synthetic-aperture image of a fixed, diffusely scattering target with a moving aperture. A number of fine-resolution, well-focused SAIL images are shown, including both retroreflecting and diffuse scattering targets, with a comparison of resolution between real-aperture imaging and synthetic-aperture imaging. A general digital signal-processing solution to the laser waveform instability problem is described and demonstrated, involving both new algorithms and hardware elements. These algorithms are primarily data driven, without a priori knowledge of waveform and sensor position, representing a crucial step in developing a robust imaging system.
Authors:
Steven M Beck; Joseph R Buck; Walter F Buell; Richard P Dickinson; David A Kozlowski; Nicholas J Marechal; Timothy J Wright
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  44     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-12-20     Completed Date:  2006-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7621-9     Citation Subset:  -    
Affiliation:
Aerospace Corporation, P.O. Box 92957, Los Angeles, California 90009-2957, USA.
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