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

Ehrenfried, Klaus and Koop, Lars (2006) A comparision of iterative deconvolution algorithms for the mapping of acoustic sources. American Institute of Aeronautics and Astronautics (AIAA). 12th AIAA/CEAS Aeroacoustics Conference, 2006-05-08 - 2006-05-10, Cambridge, MA (USA).

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Official URL: http://www.aiaa.org/

Abstract

The DAMAS2 algorithm is compared with several 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 modified gradient-type NNLS approach, where spectral procedures are implemented to accelerate the computations. Both methods require a computational effort similar to the DAMAS2 algorithm. All three algorithms use an approximate shift invariant point-spread function. %do not take the variation of the %point-spread function into account. %They solve the deconvolution problem only approximately. Furthermore 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. The resulting methods have two nested iterations, which require much more numerical effort than a single DAMAS2 iteration loop. 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 modified gradient-type NNLS, and the Richardson-Lucy algorithm are compared. It is shown that these algorithms more or less introduce oscillations in the reconstructed source distribution. 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 approximate methods lead to distorted results, while the methods with nested iterations give a significantly better reconstruction of the source distribution.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:A comparision of iterative deconvolution algorithms for the mapping of acoustic sources
Authors:
AuthorsInstitution or Email of Authors
Ehrenfried, KlausUNSPECIFIED
Koop, LarsUNSPECIFIED
Date:10 May 2006
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-19
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Series Name:Conference Proceedings
Status:Published
Keywords:Acoustic array, beamforming, deconvolution, DAMAS
Event Title:12th AIAA/CEAS Aeroacoustics Conference
Event Location:Cambridge, MA (USA)
Event Type:international Conference
Event Dates:2006-05-08 - 2006-05-10
Organizer:American Institute of Aeronautics and Astronautics (AIAA)/Council of European Aerospace Societies (CEAS)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old), Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment, L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics, L - Quiet Air Traffic (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Dr.rer.nat. Klaus Ehrenfried
Deposited On:25 Jul 2007
Last Modified:27 Apr 2009 12:56

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