2012
DOI: 10.1155/2012/292695
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Three-Dimensional Acoustic Source Mapping with Different Beamforming Steering Vector Formulations

Abstract: Acoustic source mapping techniques using acoustic sensor arrays and delay-and-sum beamforming techniques suffer from bad spatial resolution at low-aperture-based Helmholtz numbers. This is especially a problem for three-dimensional map grids, when the sensor array is not arranged around the region spanned by the grid but on only one side of it. Then, the spatial resolution of the result map in the direction pointing away from the array is much worse than in the other lateral directions. Consequently, deconvolu… Show more

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Cited by 113 publications
(93 citation statements)
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“…The steering vector accounts for the phase shifts and change in amplitude between the source and each microphone [6,9,19]. Different steering vector normalizations are found in the literature [20], but none of them is able to provide the exact source location and the correct source strength at the same time, although the errors are typically small for acoustic sources close to nadir, as considered in this paper. In this research, two different normalizations were employed.…”
Section: B Functional Beamformingmentioning
confidence: 99%
“…The steering vector accounts for the phase shifts and change in amplitude between the source and each microphone [6,9,19]. Different steering vector normalizations are found in the literature [20], but none of them is able to provide the exact source location and the correct source strength at the same time, although the errors are typically small for acoustic sources close to nadir, as considered in this paper. In this research, two different normalizations were employed.…”
Section: B Functional Beamformingmentioning
confidence: 99%
“…Scan points are selected as locations where sources may exist. This steering vector is selected such that the magnitude of the beamformer output when steered to the source location r ℓ 0 in an isolated point source acoustic measurement corresponds to the magnitude of the acoustic pressure measured at the center of the array due to the source [4,20]. One way to obtain the conventional beamforming equation [12,21] for power P from scan point ℓ using a CSM is given by…”
Section: Theoretical Development and Implementationmentioning
confidence: 99%
“…Esta técnica permite a separação de fontes concorrentes sobre um modelo de testes e a estimativa do nível de ruído emitido por cada distribuição de fontes pela simples integração de níveis discretos de pressão sonora, (SARRADJ, 2012).…”
Section: Pontas De Flapeunclassified
“…mostra uma formulação geral para beamforming convencional no domínio da frequência bastante encontrada na literatura, tal como em Sarradj (2012), para cada ponto na malha. Espera-se de um algoritmo de beamforming que a resposta máxima (pico), ocorra quando o ponto focal na malha ( ) coincida com a posição real da fonte.…”
Section: Malhaunclassified
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