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Adaptive near-field beamforming techniques for sound source imaging
2009
Journal of the Acoustical Society of America
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Phased array signal processing techniques such as beamforming have a long history in applications such as sonar for detection and localization of far-field sound sources. ...
Sound source resolution accuracies of near-field imaging procedures with different weighting strategies are compared using numerical simulations both in anechoic and reverberant environments with random ...
INTRODUCTION Beamforming has a long history of use in applications such as sonar for detection and localization of far-field sound sources. 1,2 For sources that lie in the far-field, beamforming has two ...
doi:10.1121/1.3050248
pmid:19206871
fatcat:womokqbzqbckbbl67ycber64ea
The spatial data-adaptive minimum-variance distortionless-response beamformer on seismic single-sensor data
2008
Geophysics
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In the determination of optimal weights, a parameter that controls the robustness of the beamformer against an arbitrary desired signal mismatch has to be chosen so that the results are optimal. ...
We compare results of MVDR beamforming with standard array forming on single-sensor synthetic and field seismic data. We apply 2D and 3D beamforming and show prestack and poststack results. ...
To prevent spatial aliasing of reflected waves, an array of 12 elements, meaning an array length of 30 m, was used in this case. ...
doi:10.1190/1.2969058
fatcat:qi24bwgbuvdnflx5jcc4n2qlq4
Adaptive beamforming for array imaging of plate structures using lamb waves
2010
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
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Known issues of the MVDR approach, such as signal cancellation in highly correlated environments and poor robustness, are addressed using methods that have proven effective for the purpose in other fields ...
It is shown that the MVDR algorithm performs better in terms of higher resolution and better side lobe and mode suppression capabilities. ...
The imaging covers 360°, in both near-field and far-field using a rectangular array as illustrated in Fig. 1 . a single transmitter located at z t = [x t , y t ] T , that may be an array element or a ...
doi:10.1109/tuffc.2010.1745
pmid:21156367
fatcat:wp6t7xejgfgunhpoklyke5dq64
Comparison of beamforming methods to reconstruct extended, partially-correlated sources
2017
Journal of the Acoustical Society of America
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All three methods are successful in reproducing the field and source properties in high-amplitude regions. ...
Cross beamforming methods improve upon traditional beamforming in that they relax the assumption of multiple-source incoherence. ...
The different wavepackets [of which five are displayed in Fig. 1(a) ] are weighted in amplitude such that greater weighting is given to wavepackets with a spatial wavenumber approaching /2. ...
doi:10.1121/1.4989105
fatcat:y6gn6ffcyrdcjg47it4f7263xu
Parallel spatial processing: A cure for signal cancellation in adaptive arrays
1986
IRE Transactions on Antennas and Propagation
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It results in a spatially smoothed maximum-likelihood estimate of the desired signal when the adaptive beamformer converges. ...
A spatial processing algorithm with parallel structure is presented for the prevention of signal cancellation phenomena in conventional adaptive arrays. ...
For a far-field planewave jammer, each element receives equal jammer amplitude, namely I 0 x 1 = 10x1. The received amplitude may vary from element to element for a near-field jammer. ...
doi:10.1109/tap.1986.1143820
fatcat:vjlc5kzo3zbf3jphnufqtlia7i
A comparative analysis of algorithms for the magnetoencephalography inverse problem
2008
Journal of Physics, Conference Series
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The methods are: an eigenspace projected beamformer, an algorithm implementing multiple signal classification with recursively applied projection and a particle filter for Bayesian tracking. ...
Synthetic data with neurophysiological significance are analyzed by the three methods to recover position and amplitude time course of the active sources. ...
Algorithm. Beamformers are spatial filters discriminating the signals on the basis of their spatial location. ...
doi:10.1088/1742-6596/135/1/012094
fatcat:odbfen5lkzcgdk5ffm7sulgsne
Particle filtering, beamforming and multiple signal classification for the analysis of magnetoencephalography time series: a comparison of algorithms
2010
Inverse Problems and Imaging
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The methods are: a linearly constrained minimum variance beamformer, an algorithm implementing multiple signal classification with recursively applied projection and a particle filter for Bayesian tracking ...
Synthetic data with neurophysiological significance are analyzed by the three methods to recover position, orientation and amplitude of the active sources. ...
Lauri Parkkonen of the Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, is kindly acknowledged for useful discussions and for providing us the auditory data. ...
doi:10.3934/ipi.2010.4.169
fatcat:ialh2ntt7jbd5o2du2zkqyrvhm
Implementation of Adaptive Digital Beamforming using Cordic
2014
International Journal of Computer Applications Technology and Research
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Matlab code is used to implement sin and cos using cordic angles and amplitude response of beamformed data by optimized method in order to enlarge the validity region of beamforming. ...
Adaptive beamformer is used to improve the quality of the sonar image. As a result we get an image containing more useful and correct information. ...
far field and the near field [4] , [6] . ...
doi:10.7753/ijcatr0312.1013
fatcat:qry762ioozadvmmoevcustibju
Dimensionality Reduced Antenna Array for Beamforming/steering
[article]
2022
arXiv
pre-print
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Beamforming makes possible a focused communication method. ...
Conventional beam steering often requires the addition of separate active amplitude phase control units after each radiating element. ...
(e) Reconstructed weight matrix far-field pattern from 0° to 30°. (f) Iterative convergence of PSO algorithm. ...
arXiv:2210.16197v1
fatcat:yemuqikoj5allccgjnjrb3xhfy
In-Depth Exploration of Signal Self-Cancellation Phenomenon to Achieve DOA Estimation of Underwater Acoustic Sources
2019
Applied Sciences
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In the ocean environment, the minimum variance distortionless response beamformer usually has the problem of signal self-cancellation, that is, the acoustic signal of interest is erroneously suppressed ...
First, a pseudo spatial power spectrum is obtained by performing unit circle mapping on the beam response in the direction interval. ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/app9030570
fatcat:v2q76vaekrfqrnjd5ubrzs4bjm
Time-Domain Optimized Near-Field Estimator for Ultrasound Imaging: Initial Development and Results
2008
IEEE Transactions on Medical Imaging
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We performed a series of simulations using synthetic ultrasound data to test the performance of this algorithm and compared it to conventional, data independent, delay and sum beamforming (CBF) method. ...
Typically, higher resolution and contrast is attainable using adaptive beamforming at the price of an increased computational load. ...
In adaptive beamforming (ABF), the information encapsulated in the data received by an array of sensors is used to determine a set of weights that optimize the beamformer output. ...
doi:10.1109/tmi.2007.903579
pmid:18270066
pmcid:PMC2850070
fatcat:7xud72jc3bacznzndow2oihoci
DOA Estimation of Indoor Sound Sources Based on Spherical Harmonic Domain Beam-Space MUSIC
2023
Symmetry
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Beamforming enhances the incoming signal in the desired direction and reduces the SNR threshold as well as the dimension of the signal covariance matrix. ...
Therefore, the broadband beamforming constructed in this paper allows for the arbitrary adjustment of beam steering without the need to redesign the beam shape. ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/sym15010187
fatcat:umo777copnctpbkh2hmkmdmj2e
Sharpening of Angular Spectra Based on a Directional Re-assignment Approach for Ambisonic Sound-field Visualisation
2019
ICASSP 2019 - 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
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ABSTRACT A method for computing and sharpening angular spectra, derived from low-order ambisonic signals, is presented in this paper, which is intended for high-resolution directional sound-field visualisation ...
It is demonstrated that the proposed method, when using loworder input, can achieve similar results to the SRP approach of much higher order. ...
The notion of an intensity vector due to contributions in a spatially-localised region of the sound-field was introduced in [11] . ...
doi:10.1109/icassp.2019.8683621
dblp:conf/icassp/McCormackPP19
fatcat:zdrdjmiwpzdunkpiu6vdu2jzxu
Adaptive processing method for interference cancellation in sky-wave OTHR
2019
The Journal of Engineering
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An algorithm is proposed to cancel the spatially non-stationary high-frequency (HF) interference in the returns of skywave over-the-horizon radar (OTHR). ...
The algorithm could suppress the interference in side-lobe effectively based on spatial adaptive processing. ...
Acknowledgments This work was supported by the National Natural Science Foundation of China (no. 61132005). ...
doi:10.1049/joe.2019.0756
fatcat:63fbfb63azfpdmjjet2bz4y2fq
Design of Robust Near-field Multi-beam forming Based on improved LCMV algorithm
2015
Journal of Information Hiding and Multimedia Signal Processing
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This improved LCMV algorithm upon an uncertain set for near-field multi-beam is presented in this paper. ...
Most existing approaches for multi-beam forming use algorithm in sub-array respectively and switch the direction of beam to realize multi-area coverage. ...
The authors specifically wish to acknowledgement someone for their helpful comments and insightful reviews of this paper which help to improve the quality of the paper. ...
dblp:journals/jihmsp/LiaoHG15
fatcat:xjadnjutq5glrfrbezw7uoluyu
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