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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 35 — Dec. 10, 2004
  • pp: 6421–6439

Optoelectronic implementation of a 256-channel sonar adaptive-array processor

Paulo E. X. Silveira, Gour S. Pati, and Kelvin H. Wagner  »View Author Affiliations


Applied Optics, Vol. 43, Issue 35, pp. 6421-6439 (2004)
http://dx.doi.org/10.1364/AO.43.006421


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Abstract

We present an optoelectronic implementation of an adaptive-array processor that is capable of performing beam forming and jammer nulling in signals of wide fractional bandwidth that are detected by an array of arbitrary topology. The optical system makes use of a two-dimensional scrolling spatial light modulator to represent an array of input signals in 256 tapped delay lines, two acousto-optic modulators for modulating the feedback error signal, and a photorefractive crystal for representing the adaptive weights as holographic gratings. Gradient-descent learning is used to dynamically adapt the holographic weights to optimally form multiple beams and to null out multiple interference sources, either in the near field or in the far field. Space-integration followed by differential heterodyne detection is used for generating the system’s output. The processor is analyzed to show the effects of exponential weight decay on the optimum solution and on the convergence conditions. Several experimental results are presented that validate the system’s capacity for broadband beam forming and jammer nulling for linear and circular arrays.

© 2004 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(070.1060) Fourier optics and signal processing : Acousto-optical signal processing
(090.7330) Holography : Volume gratings
(200.4560) Optics in computing : Optical data processing
(230.6120) Optical devices : Spatial light modulators
(280.5110) Remote sensing and sensors : Phased-array radar

History
Original Manuscript: March 5, 2004
Revised Manuscript: July 6, 2004
Manuscript Accepted: August 19, 2004
Published: December 10, 2004

Citation
Paulo E. X. Silveira, Gour S. Pati, and Kelvin H. Wagner, "Optoelectronic implementation of a 256-channel sonar adaptive-array processor," Appl. Opt. 43, 6421-6439 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-35-6421

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