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Theoretical and numerical simulation to control the wideband three-dimensional interfering noise by the broadband
1Naval Sea Systems Command, Division Newport, Newport, Rhode Island 02841, USA.
The Journal of the Acoustical Society of America
|February 11, 2024
Summary
This study uses constant beam pattern (CBP) spherical array synthesis to cancel wideband noise. The method effectively suppresses interfering noise sources across a broad frequency range using a single shading function.
Area of Science:
- Acoustics and Signal Processing
- Electromagnetics and Array Theory
Background:
- Interfering noise sources pose challenges in signal processing.
- Broadband noise cancellation requires robust array synthesis techniques.
Purpose of the Study:
- To apply constant beam pattern (CBP) spherical array synthesis for suppressing wideband 3D noise.
- To demonstrate a method for creating nulls in specific noise source directions.
Main Methods:
- Modified array angular shading function expanded by spherical harmonics.
- Implanting zeros in the synthesized shading function to cancel noise.
- Utilizing CBP theory for large radius-to-wavelength ratios.
Main Results:
- Simulated numerical examples validate the wideband noise suppression method.
- Broadband CBP performance is maintained with various shading functions (Legendre, Dolph-Chebyshev).
- A single set of real shading functions effectively cancels noise across the operating band.
Conclusions:
- The CBP spherical array synthesis effectively suppresses wideband 3D interfering noise.
- The method maintains broadband constant beam pattern performance.
- This approach offers a unified solution for noise cancellation across multiple frequencies.
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