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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 35 — Dec. 10, 2005
  • pp: 7621–7629

Synthetic-aperture imaging laser radar: laboratory demonstration and signal processing

Steven M. Beck, Joseph R. Buck, Walter F. Buell, Richard P. Dickinson, David A. Kozlowski, Nicholas J. Marechal, and Timothy J. Wright  »View Author Affiliations


Applied Optics, Vol. 44, Issue 35, pp. 7621-7629 (2005)
http://dx.doi.org/10.1364/AO.44.007621


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Abstract

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.

© 2005 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(100.3010) Image processing : Image reconstruction techniques
(110.0110) Imaging systems : Imaging systems
(280.3640) Remote sensing and sensors : Lidar
(280.6730) Remote sensing and sensors : Synthetic aperture radar

ToC Category:
Image Processing

History
Original Manuscript: August 19, 2004
Revised Manuscript: August 10, 2005
Manuscript Accepted: July 18, 2005
Published: December 10, 2005

Citation
Steven M. Beck, Joseph R. Buck, Walter F. Buell, Richard P. Dickinson, David A. Kozlowski, Nicholas J. Marechal, and Timothy J. Wright, "Synthetic-aperture imaging laser radar: laboratory demonstration and signal processing," Appl. Opt. 44, 7621-7629 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-35-7621

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