Superdirective beamforming based on spherical harmonic expansion on planar acoustic vector sensor arrays
The superdirective beamforming method based on spherical harmonic expansion is capable of generating a frequency-invariant three-dimensional (3D) beampattern. When applied to planar acoustic vector sensor arrays (PAVSAs), this method may yield a distorted beampattern. To rectify the issue of inaccur...
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| Published in: | Signal processing Vol. 230; p. 109836 |
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| Format: | Journal Article |
| Language: | English |
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01.05.2025
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| ISSN: | 0165-1684 |
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| Abstract | The superdirective beamforming method based on spherical harmonic expansion is capable of generating a frequency-invariant three-dimensional (3D) beampattern. When applied to planar acoustic vector sensor arrays (PAVSAs), this method may yield a distorted beampattern. To rectify the issue of inaccurate beampattern steering, the main lobe constraints are introduced to align the main lobe's steering direction with the intended direction. An optimized superdirective beamforming method is proposed by integrating the superdirective beamformer based on spherical harmonic expansion with the main lobe constraints. Then, a robust version of the proposed beamformer is also proposed by employing the white noise gain (WNG) constraint. The simulation results corroborate the theoretical analysis and substantiate the feasibility and superiority of the proposed methods. |
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| AbstractList | The superdirective beamforming method based on spherical harmonic expansion is capable of generating a frequency-invariant three-dimensional (3D) beampattern. When applied to planar acoustic vector sensor arrays (PAVSAs), this method may yield a distorted beampattern. To rectify the issue of inaccurate beampattern steering, the main lobe constraints are introduced to align the main lobe's steering direction with the intended direction. An optimized superdirective beamforming method is proposed by integrating the superdirective beamformer based on spherical harmonic expansion with the main lobe constraints. Then, a robust version of the proposed beamformer is also proposed by employing the white noise gain (WNG) constraint. The simulation results corroborate the theoretical analysis and substantiate the feasibility and superiority of the proposed methods. |
| ArticleNumber | 109836 |
| Author | Guo, Junyuan Han, Mingqian |
| Author_xml | – sequence: 1 givenname: Mingqian surname: Han fullname: Han, Mingqian organization: National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China – sequence: 2 givenname: Junyuan surname: Guo fullname: Guo, Junyuan email: guojunyuan@hrbeu.edu.cn organization: National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China |
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| Keywords | Superdirective beamforming Planar acoustic vector sensor arrays Spherical harmonic expansion Main lobe constraints |
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| SubjectTerms | Main lobe constraints Planar acoustic vector sensor arrays Spherical harmonic expansion Superdirective beamforming |
| Title | Superdirective beamforming based on spherical harmonic expansion on planar acoustic vector sensor arrays |
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