Achieving 3D Beamforming by Non-Synchronous Microphone Array Measurements

Yu, Liang; Guo, Qixin; Chu, Ning; Wang, Rui

doi:10.3390/s20247308

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…Beamforming based on sensor/antenna array [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] has attracted much attention since the apparent advantage over the single sensor/antenna. The earliest beamforming technique is the delay-and-sum (DS) structure, which is investigated widely in narrowband applications [ 8 , 9 , 10 , 11 ], such as radar, sonar and antenna.…”

Section: Introductionmentioning

confidence: 99%

Design of Planar Differential Microphone Array Beampatterns with Controllable Mainlobe Beamwidth and Sidelobe Level

Wang

Zhao

et al. 2023

Sensors

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The differential microphone array, or differential beamformer, has attracted much attention for its frequency-invariant beampattern, high directivity factor and compact size. In this work, the design of differential beamformers with small inter-element spacing planar microphone arrays is concerned. In order to exactly control the main lobe beamwidth and sidelobe level and obtain minimum main lobe beamwidth with a given sidelobe level, we design the desired beampattern by applying the Chebyshev polynomials at first, via exploiting the structure of the frequency-independent beampattern of a theoretical Nth-order differential beamformer. Next, the so-called null constrained and least square beamformers, which can obtain approximately frequency-invariant beampattern at relatively low frequencies and can be steered to any direction without beampattern distortion, are proposed based on planar microphone arrays to approximate the designed desired beampatterns. Then, for dealing with the white noise amplification at low-frequency bands and beampattern divergence problems at high-frequency bands of the null constrained and least square beamformers, the so-called minimum norm and combined solutions are deduced, which can compromise among the white noise gain, directivity factor and beampattern distortion flexibly. Preliminary simulation results illustrate the properties and advantages of the proposed differential beamformers.

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Section: Introductionmentioning

confidence: 99%

Design of Planar Differential Microphone Array Beampatterns with Controllable Mainlobe Beamwidth and Sidelobe Level

Wang

Zhao

et al. 2023

Sensors

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“…Nascimento et al [19] proposed a beamforming algorithm based on the least squares problem under non-linear constraints. Wang et al [20] applied asynchronous measurements of microphone arrays to 3-D beamforming. However, the resolution of positioning using beamforming is poor and cannot meet the requirements of PD localization.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al. [20] applied asynchronous measurements of microphone arrays to 3‐D beamforming. However, the resolution of positioning using beamforming is poor and cannot meet the requirements of PD localization.…”

Section: Introductionmentioning

confidence: 99%

Optimization scheme of partial discharge location of external insulation based on 2‐D multiple signal classification algorithm

Pei

Liu

et al. 2022

IET Science Measure & Tech

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Partial discharge (PD) localization is critical to ensure the safe operation of power equipment. In this paper, an optimization scheme is developed for PD positioning of external insulation equipment. The optimization scheme is based on an eight‐element cross sensor array to receive the ultrasonic signal generated by the PD, and uses the highly accurate 2‐D multiple signal classification (2‐D MUSIC) algorithm to locate the signal. Simulated discharge signal is adopted to test the optimization scheme, and the results show that the positioning error is less than 0.61° when the signal‐to‐noise ratio (SNR) is above −5 dB. In addition, three discharge models are tested at various locations. The average azimuth errors are 0.9°, 1.9°, and 1.55° for the needle‐plate, cone‐plate, and ball‐plate discharge models, respectively, and the average pitch angle errors are 0.75°, 2.1°, and 1.4°, respectively. These show that the needle‐plate model has the best positioning effect. Simulations and experiments are also carried out on the double discharge source scenario, and the error is within 2.2°. A PD location visualization equipment based on the proposed optimization scheme is developed and applied on‐site. The equipment is capable of satisfying the requirements of operation and maintenance.

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Virtual Augmentation of the Beamforming Array Based on a Sub-cross-spectral Matrix Computation for Localizing Stationary Signal Noise Sources

Singh,

Mimani

2024

Acoust Aust

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Achieving 3D Beamforming by Non-Synchronous Microphone Array Measurements

Cited by 10 publications

References 37 publications

Design of Planar Differential Microphone Array Beampatterns with Controllable Mainlobe Beamwidth and Sidelobe Level

Design of Planar Differential Microphone Array Beampatterns with Controllable Mainlobe Beamwidth and Sidelobe Level

Optimization scheme of partial discharge location of external insulation based on 2‐D multiple signal classification algorithm

Virtual Augmentation of the Beamforming Array Based on a Sub-cross-spectral Matrix Computation for Localizing Stationary Signal Noise Sources

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