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Extending the bandwidth of an acoustic beamforming array using phase unwrapping and array interpolation.
Caleb B Goates1, Blaine M Harker1, Tracianne B Neilsen1
1Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA calebgoates@gmail.com, blaineharker@gmail.com, tbn@byu.edu, kentgee@byu.edu.
The Journal of the Acoustical Society of America
|May 4, 2017
Summary
This study introduces a novel beamforming method using phase unwrapping and array interpolation to suppress grating lobes. This technique enhances source localization accuracy at high frequencies, significantly improving spatial resolution.
Area of Science:
- Signal Processing
- Acoustics
- Array Signal Processing
Background:
- Grating lobes in beamforming can obscure true source locations.
- Accurate source localization is crucial in various acoustic and radar applications.
Purpose of the Study:
- To develop and present a method for suppressing grating lobes in beamforming.
- To improve the accuracy and frequency range of source localization techniques.
Main Methods:
- Utilizes phase unwrapping of cross spectra.
- Employs array interpolation of the cross spectral matrix magnitude and phase.
- Applies the method to broadband source localization and frequency-dependent source characterization.
Main Results:
- Successfully suppresses grating lobes.
- Enables straightforward interpolation even above the spatial Nyquist frequency.
- Achieves accurate source localization at frequencies up to 8 times the spatial Nyquist frequency.
Conclusions:
- The proposed method effectively mitigates grating lobes in beamforming.
- This technique significantly extends the operational frequency range for accurate source localization.
- Offers a robust solution for complex source localization scenarios.
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