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A comparison of iterative deconvolution algorithms for the mapping of acoustic sources

Ehrenfried, Klaus and Koop, Lars (2006) A comparison of iterative deconvolution algorithms for the mapping of acoustic sources. AIAA Journal, 45 (7), pp. 1584-1595. DOI: 10.2514/1.26320.

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Abstract

The DAMAS algorithm is compared with the DAMAS2 method and two other Fourier-based deconvolution approaches. One is the Richardson-Lucy method, which is widely used for the deconvolution of astronomical images. The second is a gradient-type NNLS approach, where spectral procedures are implemented to accelerate the computations. It is described how the DAMAS2 and the Fourier-based NNLS algorithms can be embedded in an outer iteration loop to take the variation of the point-spread function into account. All methods are tested with synthetic data. At first an example with a simple linear array and a small opening angle is considered, where the variation of the point-spread function in the source region is negligible. In this test case the results of the DAMAS2, the Fourier-based NNLS, the Richardson-Lucy, and the original DAMAS algorithm are compared. It is shown that all algorithms more or less introduce oscillations in the reconstructed source distribution. The effect of background noise on the results is investigated. A second test case with a planar array and a large opening angle is presented, to demonstrate the influence of a strong variation of the point-spread function. It is shown that the methods which neglect the variation of the point-spread function lead to distorted results, while the embedded Fourier-based methods and the DAMAS algorithm give a significantly better reconstruction of the source distribution.

Document Type:Article
Title:A comparison of iterative deconvolution algorithms for the mapping of acoustic sources
Authors:
AuthorsInstitution or Email of Authors
Ehrenfried, KlausUNSPECIFIED
Koop, LarsUNSPECIFIED
Date:May 2006
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:45
DOI:10.2514/1.26320
Page Range:pp. 1584-1595
Status:Published
Keywords:Acoustic array, beamforming, deconvolution, DAMAS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Dr.rer.nat. Klaus Ehrenfried
Deposited On:06 Jul 2007
Last Modified:14 Jan 2010 23:27

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