Circular Acoustic Vector-Sensor Array for Mode Beamforming

Zou, Nan; Nehorai, Arye

doi:10.1109/tsp.2009.2019174

Cited by 55 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Torres et al (2012), the CH framework is employed in combination with time-frequency processing for robust source localisation in noisy and reverberant environments. The potential of CH beamforming for underwater acoustic systems has also been explored in Liu (2012), McIntyre et al (2015, and Zou and Nehorai (2009).…”

Section: A Underwater Sound-field Visualisation Techniquesmentioning

confidence: 99%

Parametric spatial post-filtering utilising high-order circular harmonics with applications to underwater sound-field visualisation

Bountourakis

McCormack

Winberg

et al. 2021

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

Beamforming using a circular array of hydrophones may be employed for the task of two-dimensional (2D) underwater sound-field visualisation. In this article, a parametric spatial post-filtering method is proposed, which is specifically intended for applications involving large circular arrays and aims to improve the spatial selectivity of traditional beamformers. In essence, the proposed method is a reformulation of the cross-pattern coherence (CroPaC) spatial post-filter, which involves calculating the normalised cross-spectral density between two signals originating from coincident beamformers. The resulting parameter may be used to sharpen another beamformer steered in the same look-direction, while attenuating ambient noise and interferers from other directions. However, while the original 2D version of the algorithm has been demonstrated to work well with second-order circular harmonic input, it becomes increasingly less suitable with increasing input order. Therefore, the proposed reformulation extends the applicability of CroPaC for much higher orders of circular harmonic input. The method is evaluated with simulated data of a 96-channel circular hydrophone array in three different passive sonar scenarios, where the proposed post-filter is shown to improve the spatial selectivity of both delay-and-sum and minimum-variance distortionless response beamformers. V

show abstract

Section: A Underwater Sound-field Visualisation Techniquesmentioning

confidence: 99%

Parametric spatial post-filtering utilising high-order circular harmonics with applications to underwater sound-field visualisation

Bountourakis

McCormack

Winberg

et al. 2021

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

show abstract

“…Hence, when 1 þ 2r 2 g is negligible when compared with all other terms inside of the square bracket, sin 2 ð2/ L Þ sin 2 ð/ L Þ would dominate the periodic behavior of variance in Eq. (10). (viii) In Eq.…”

Section: The Actual Look Direction For Each Stochastic Realizatiomentioning

confidence: 99%

“…(9) and (16), as well as the corresponding variances analytically derived in Eqs. (10) and (17)-Monte Carlo simulations are performed using the following procedure: In each Monte Carlo trial (a) Realize the three statistically independent but identically distributed random scalars of g x , g y , g z , each…”

Section: B the Approximate Statistics Of Peak Polar Direction H Pmentioning

confidence: 99%

Beamforming pointing error of a triaxial velocity sensor under gain uncertainties

Lin

Wong

Cordel

et al. 2016

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

A "triaxial velocity sensor" consists of three uniaxial velocity sensors, which are nominally identical, orthogonally oriented among themselves, and co-centered at one point in space. A triaxial velocity sensor measures the acoustic particle velocity vector, by its three Cartesian components, individually component-by-component, thereby offering azimuth-elevation two-dimensional spatial directivity, despite the physical compactness that comes with the collocation of its three components. This sensing system's azimuth-elevation beam-pattern has been much analyzed in the open literature, but only for an idealized case of the three uniaxial velocity sensors being exactly identical in gain. If this nominal identity is violated among the three uniaxial velocity sensors, as may occur in practical hardware, what would happen to the corresponding "spatial matched filter" beam-pattern's peak direction? How would this effective peak direction deviate from the nominal "look direction"? This paper, by modeling each uniaxial velocity sensor's gain as stochastic, derives this deviation's statistical mean and variance, analytically in closed mathematical forms. This analytical derivation is verified by Monte Carlo simulations.

show abstract

“…The simulation results show that DOA performance and array gain are independent of frequency, and mainly depend on the highest mode of sound field that can be excited by circular array. The array aperture of 26cm can accurately estimate the narrow-band sound source of 600Hz [9]. Professor Yang Desen of China developed two kinds of 8-element vector circular arrays for barrier conditions and free field environment, derived the preprocessing matrix of sound pressure and particle vibration velocity based on the sound field decomposition theory, and then constructed the covariance matrix of sound pressure and vibration velocity, and realized Angle estimation by applying various beamforming methods [10].…”

Section: Introductionmentioning

confidence: 99%

Design and experimental application of circular array of vector underwater acoustic sensor

Huang,

Hong

2023

International Conference on Automation Control, Algorithm, and Intelligent Bionics (ACAIB 2023)

View full text Add to dashboard Cite

Vector hydrophone is a new type of underwater acoustic sensor, which is one of the hot spots in the field of underwater acoustic technology in the 21st century. In order to explore the feasibility of vector hydrophone circumferential array in engineering applications, a 16-yuan composite vector hydrophone circumferential array is designed and manufactured in this paper. The array diameter is 1.92m and the working frequency band is 20~3000Hz. The experimental results show that the array has better target azimuth estimation ability than scalar circular array.

show abstract

Circular Acoustic Vector-Sensor Array for Mode Beamforming

Cited by 55 publications

References 30 publications

Parametric spatial post-filtering utilising high-order circular harmonics with applications to underwater sound-field visualisation

Parametric spatial post-filtering utilising high-order circular harmonics with applications to underwater sound-field visualisation

Beamforming pointing error of a triaxial velocity sensor under gain uncertainties

Design and experimental application of circular array of vector underwater acoustic sensor

Contact Info

Product

Resources

About