Single-mode excitation in the shallow-water acoustic channel using feedback control

Buck, John R.; Preisig, James C.; Johnson, Mark; Catipovic, Josko

doi:10.1109/48.585947

Cited by 16 publications

(1 citation statement)

References 34 publications

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“…For instance, in [32], the authors proposed the use of acoustic contrast control strategies to focus sound in shallow water. In the same environment, the works [3,43] developed a single-mode excitation with a feedback control algorithm to achieve both near-and far-field sound control.…”

Section: Introductionmentioning

confidence: 99%

Active manipulation of Helmholtz scalar fields: near-field synthesis with directional far-field control

Egarguin¹,

Onofrei²,

Qi³

et al. 2020

Inverse Problems

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In this article, we propose a strategy for the active manipulation of scalar Helmholtz fields in bounded near-field regions of an active source while maintaining desired radiation patterns in prescribed far-field directions. This control problem is considered in two environments: free space and homogeneous ocean of constant depth, respectively. In both media, we proved the existence of and characterized the surface input, modeled as Neumann data (normal velocity) or Dirichlet data (surface pressure) such that the radiated field satisfies the control constraints. We also provide a numerical strategy to construct this predicted surface input by using a method of moments-approach with a Morozov discrepancy principle-based Tikhonov regularization. Several numerical simulations are presented to demonstrate the proposed scheme in scenarios relevant to practical applications.

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Section: Introductionmentioning

confidence: 99%

Active manipulation of Helmholtz scalar fields: near-field synthesis with directional far-field control

Egarguin¹,

Onofrei²,

Qi³

et al. 2020

Inverse Problems

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Underwater Acoustic Communication

Stojanovic

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

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Underwater wireless communications over distances in excess of about 100 m are established using acoustic signals. Acoustic signals propagate as pressure waves, whose energy absorption limits the available bandwidth. As a result, existing technology provides bit rates on the order of several kilobits per second for transmission over distances on the order of several kilometers. Additional challenges are presented by multipath propagation that causes frequency selectivity, random time variation, and Doppler effects that occur due to low speed of sound (1500 m/s). This article overviews the development of acoustic modem technology, which evolved over the past several decades from noncoherent modulation/detection techniques to bandwidth‐efficient phase‐coherent modulation/detection. A survey of techniques for channel equalization in single‐carrier systems as well as recent advances in multicarrier acoustic communications is also presented.

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Feasibility analysis for active near/far field acoustic pattern synthesis in free space and shallow water environments

Egarguin

Onofrei

et al. 2021

Acta Acust.

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In this paper, a detailed sensitivity and feasibility analysis of the active manipulation scheme for scalar Helmholtz fields proposed in our previous works, in both free space and constant-depth homogeneous ocean environments, is presented. We apply the method of moments (MoM) together with Tikhonov regularization with the Morozov discrepancy principle to investigate the effects of varying the problem parameters to the accuracy and feasibility of the proposed active field control strategy. We discuss the feasibility of the active scheme (with respect to power budget, control accuracy and process error) as a function of the frequency, the distance between the control region and the source, the mutual distance between the control regions, and the size of the control region. Process error is considered as well to investigate the possibility of an accurate active control in the presence of manufacturing or feeding noise. The numerical simulations show the accuracy of the active field control scheme and indicate some challenges and limitations for its physical implementation.

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Single-mode excitation in the shallow-water acoustic channel using feedback control

Cited by 16 publications

References 34 publications

Active manipulation of Helmholtz scalar fields: near-field synthesis with directional far-field control

Active manipulation of Helmholtz scalar fields: near-field synthesis with directional far-field control

Underwater Acoustic Communication

Feasibility analysis for active near/far field acoustic pattern synthesis in free space and shallow water environments

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