Extending the bandwidth of an acoustic beamforming array using phase unwrapping and array interpolation | Zendy

Caleb B. Goates | Zendy; Blaine M. Harker | Zendy; Tracianne B. Neilsen | Zendy; Kent L. Gee | Zendy

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Extending the bandwidth of an acoustic beamforming array using phase unwrapping and array interpolation

Author(s) -

Caleb B. Goates,

Blaine M. Harker,

Tracianne B. Neilsen,

Kent L. Gee

Publication year - 2017

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.4981235

Subject(s) - beamforming , broadband , interpolation (computer graphics) , grating , nyquist frequency , bandwidth (computing) , acoustics , optics , phase (matter) , nyquist–shannon sampling theorem , phase unwrapping , computer science , physics , telecommunications , interferometry , frame (networking) , quantum mechanics , computer vision

A method is presented to suppress grating lobes in beamforming using phase unwrapping and array interpolation. When the phase of each cross spectrum is successfully unwrapped, the magnitude and phase of the cross spectral matrix may be interpolated; for cases where these quantities vary smoothly, interpolation is straightforward, even above the spatial Nyquist frequency. Two applications are presented: localization of a broadband source and characterization of a source with frequency-dependent location. In both cases, grating lobes are suppressed and the source is localized at frequencies up to at least 8 times the spatial Nyquist frequency.

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