Complex Matched Filtering of Diffraction Sound Signals Received by a Vertical Array

Matveev, A. L.

doi:10.1134/1.29850

Cited by 14 publications

(11 citation statements)

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“…4) Incoherent frequency accumulation. In the cases, where several operating frequencies were used simultaneously in the experiment, the resulting output signals were averaged over the frequencies (12) where is the number of tone signals used. If the true length and velocity of the inhomogeneity are unknown, a 2-D search for the maximum over the filter parameters and is performed.…”

Section: B Incoherent Processing Algorithmmentioning

confidence: 99%

“…Parameters and characterize the diffracted-signal duration and the Doppler frequency shift variation rate and are determined by [12] (4) respectively, where , , and is the speed of sound in water. We emphasize that signal (2) contains the phase which cannot be calculated a priori because of its extreme sensitivity to small changes in propagation conditions and to the geometry of source, receiver, and inhomogeneity, and therefore, cannot be compensated during signal processing.…”

Section: A Signal Modelmentioning

confidence: 99%

“…Experimental data from a lake experiment were presented in [11]. Incoherent accumulation combined with matched time model-based processing of the complex (amplitude and phase) signal was proposed and tested in [12]. This processing yielded the best performance for detection and parameter estimation.…”

Section: Introductionmentioning

confidence: 99%

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Forward Scattering Observation With Partially Coherent Spatial Processing of Vertical Array Signals in Shallow Water

Matveev

Spindel

Rouseff

2007

IEEE J. Oceanic Eng.

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In this paper, we address the problem of detecting an inhomogeneity in shallow water by observing changes in the acoustic field as the inhomogeneity passes between an acoustic source and vertical line array of receivers. A signal processing scheme is developed to detect the perturbed field in the presence of the much stronger primary source signal, and to estimate such parameters as the time when the inhomogeneity crosses the source-receiver path, its velocity, and its size. The effectiveness of incoherent, coherent, and partially coherent spatial processing of the array signals is evaluated using models and data obtained from experiments in a lake. The effect of different bottom types is also considered, and it is shown that partially coherent processing can have a significant advantage depending on the bottom type. Estimates of the minimum input signal-to-noise ratios (SNRs) for which the diffracted signal can be observed are presented.

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Section: B Incoherent Processing Algorithmmentioning

confidence: 99%

Section: A Signal Modelmentioning

confidence: 99%

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Forward Scattering Observation With Partially Coherent Spatial Processing of Vertical Array Signals in Shallow Water

Matveev

Spindel

Rouseff

2007

IEEE J. Oceanic Eng.

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“…Forward scattering from an intrusive object could cause aberration in the waveguide response, providing an advantage in quietobject detection [5][6][7][8]. Transient aberration results from interference between the incident and scattered fields from an object [9], and its features can be actually difficult to be predicted in a multipath environment.…”

mentioning

confidence: 98%

“…Over the past few years, a detection method using forward scattering techniques was proposed for moving underwater targets, and a successful lake experiment was conducted with a foam plastic target [5,6]. A detection and localization algorithm based on the same techniques was described and evaluated based upon the experiment in a harbor environment [7].…”

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confidence: 99%

Forward acoustic scattering by moving objects: Theory and experiment

Lei

Yang

et al. 2012

Chin. Sci. Bull.

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The normal mode model for scattering in shallow water is employed to investigate the forward scattering with a target crossing the source-receiver axial line. An experiment was conducted in a littoral environment to analyze forward scattering by a slowly moving object. The theoretical and experimental results show that the sound field aberration takes minimum values if the object is located mid-point along the source-receiver line, whereas it attains its maximum if the object is close to the source or receiver. The total field is either enhanced or suppressed if the object crosses different Fresnel zones. In addition, the duration of shadow-induced aberration is dependent on the width of the first Fresnel zone, which is longest at the mid-point of the source-receiver line.forward scattering, moving object, Fresnel zone, shadow effect, sound field aberration Citation:Lei B, Yang K D, Ma Y L, et al. Forward acoustic scattering by moving objects: Theory and experiment.

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Experimental demonstration of forward scattering barrier for AUV intruder

Lei

Yang

et al. 2022

Applied Acoustics

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Complex Matched Filtering of Diffraction Sound Signals Received by a Vertical Array

Cited by 14 publications

References 0 publications

Forward Scattering Observation With Partially Coherent Spatial Processing of Vertical Array Signals in Shallow Water

Forward Scattering Observation With Partially Coherent Spatial Processing of Vertical Array Signals in Shallow Water

Forward acoustic scattering by moving objects: Theory and experiment

Experimental demonstration of forward scattering barrier for AUV intruder

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