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

Ehrenfried, Klaus und 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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Offizielle URL: http://www.aiaa.org/

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:A comparision of iterative deconvolution algorithms for the mapping of acoustic sources
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ehrenfried, KlausNICHT SPEZIFIZIERT
Koop, LarsNICHT SPEZIFIZIERT
Datum:10 Mai 2006
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-19
Verlag:American Institute of Aeronautics and Astronautics (AIAA)
Name der Reihe:Conference Proceedings
Status:veröffentlicht
Stichwörter:Acoustic array, beamforming, deconvolution, DAMAS
Veranstaltungstitel:12th AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Cambridge, MA (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-05-08 - 2006-05-10
Veranstalter :American Institute of Aeronautics and Astronautics (AIAA)/Council of European Aerospace Societies (CEAS)
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt), Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt, L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik, L - Leiser Luftverkehr (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hubschrauber
Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Dr.rer.nat. Klaus Ehrenfried
Hinterlegt am:25 Jul 2007
Letzte Änderung:27 Apr 2009 12:56

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