Striation-Based Beamforming with Two-Dimensional Filtering for Suppressing Tonal Interference

Li, Pingzheng; Wu, Yanqun; Guo, Wei; Cao, Chunyan; Ma, Yanxin; Li, Lifan; Leng, Hongze; Zhou, Aolong; Song, Junqiang

doi:10.3390/jmse11112117

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…Waveguide invariant (β) characterizes the dispersion of normal modes in the underwater acoustic waveguide. Estimating the value of β is essential in many applications, such as passive source localization and array signal processing [1][2][3]. β is usually assumed to be equal to 1 in shallow water.…”

Section: Introductionmentioning

confidence: 99%

A multiple waveguide invariant estimation method based on the warping transform and variational mode decomposition

Wang,

Gao,

2024

Electronics Letters

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A multiple waveguide invariant (β) estimation method based on the warping transform and variational mode decomposition (VMD) from one‐dimensional broadband interference sound intensity (BISI) is presented. Firstly, an average β is estimated based on the low‐rank property of the Hankel matrix constructed by BISI. Secondly, the warping principle is used to transform BISI into a warped one. Thirdly, the conventional VMD can be used to effectively decompose the warped BISI. Finally, multiple β can be estimated, respectively. Traditional β estimation methods are based on a two‐dimensional acoustic interference pattern, whose acquisition depends on the horizontal array. This method reduces the data dimensionality of the multivalued β estimation problem without requiring any environmental prior information and is applicable to single hydrophone scenarios. The effectiveness of the presented method is validated by numerical simulation.

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Section: Introductionmentioning

confidence: 99%

A multiple waveguide invariant estimation method based on the warping transform and variational mode decomposition

Wang,

Gao,

2024

Electronics Letters

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Performance comparison of conventional and striation-based beamformers for underwater bearing detection of pulse sources

Liu,

Zhou,

2023

The Journal of the Acoustical Society of America

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The multi-path and dispersion properties of shallow water waveguides make conventional beamforming (CBF) face issues such as beam shift, broadening, splitting, output distortion, and array gain reduction. In this paper, the striation-based beamforming (SBF) is investigated to address these issues. SBF differs from CBF by utilizing frequency-shift processing along interference striations. The performance difference between CBF and SBF is compared. It demonstrates that under ideal waveguide modeling with pulse sources, SBF can achieve a beam output response that is close to the plane wave condition. The speed term of SBF's response is approximately independent of modal indexes, which equips SBF to form a unique beam output and guarantee the beam resolution. The processing of consistent signals along the striation maintains the optimal signal correlation, which makes SBF ensure the output fidelity and array gain. To shift the mainlobe of SBF to the source azimuth, the time delay related to the waveform truncation point can be introduced to pre-compensate the array signals. There exist two theoretical accuracy limits to using the truncation. First, truncation time corresponds to the waveform point at r0/c (r0 is the source range), and the mainlobe of SBF is directed to the source azimuth. Second, truncation corresponds to the pulse peak point, and the azimuth estimation accuracy of SBF gets close to CBF. Simulations and experimental results are given as illustrations.

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The Formation of 2D Holograms of a Noise Source and Bearing Estimation by a Vector Scalar Receiver in the High-Frequency Band

Pereselkov,

Kuz’kin,

Ehrhardt

et al. 2024

JMSE

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The holographic signal-processing method for a single vector scalar receiver (VSR) in the high-frequency band in shallow water is developed in the paper. The aim of this paper is to present the results of the theoretical analysis, numerical modeling, and experimental verification of holographic signal processing for a noise source by the VSR. The developed method is based on the formation of the 2D interferogram and 2D hologram of a noise source in a shallow-water waveguide. The 2D interferograms and 2D holograms for different channels of the VSR (P sound pressure and VX and VY vibration velocity components) are considered. It is shown that the 2D interferogram consists of parallel interference fingers in the presence of a moving noise source. As a result, the 2D hologram contains focal points located on a straight line, and the angular distribution of the holograms has the main extreme value. It is shown in the paper that the holographic signal-processing method allows detecting the source, estimating the source bearing, and filtering the useful signal from the noise. The results of the source detection, source bearing estimation, and noise filtering are presented within the framework of experimental data processing and numerical modeling.

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Striation-Based Beamforming with Two-Dimensional Filtering for Suppressing Tonal Interference

Cited by 5 publications

References 37 publications

A multiple waveguide invariant estimation method based on the warping transform and variational mode decomposition

A multiple waveguide invariant estimation method based on the warping transform and variational mode decomposition

Performance comparison of conventional and striation-based beamformers for underwater bearing detection of pulse sources

The Formation of 2D Holograms of a Noise Source and Bearing Estimation by a Vector Scalar Receiver in the High-Frequency Band

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