Deconvolved frequency-difference beamforming for a linear array.
J Acoust Soc Am
; 148(6): EL440, 2020 Dec.
Article
em En
| MEDLINE
| ID: mdl-33379926
ABSTRACT
Frequency-difference beamforming (FDB) provides a robust estimation of wave propagation direction by shifting signal processing to a lower frequency which, however, produces a decline in the spatial resolution. In this letter, the beam pattern of FDB for a distant point source is proved to be shift invariant and therefore can be regarded as the point spread function corresponding to FDB's beam output. Then, deconvolved frequency-difference beamforming (Dv-FDB) is proposed to improve array performance. Dv-FDB yields a narrower beam and lower sidelobe levels while maintaining robustness. The superior performance of Dv-FDB is verified by simulations and experimental data.
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MEDLINE
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En
Ano de publicação:
2020
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Article