Prefiltered Striation-Based Beamforming for Range Estimation of Multiple Sources

Li, Pingzheng; Wu, Yanqun; Ma, Yanxin; Cao, Chunfang; Leng, Hongze; Zhou, Aolong; Song, Junqiang

doi:10.3390/jmse11081550

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…To eliminate the angular constraint, Liu et al [26] proposed the waveguide-invariant dimension striation-based beamforming (WISBF) and range-dimension striation-based beamforming (RSBF) methods. To improve the quality of the interference spectrogram, especially under multi-source scenarios, the wavenumber filtering RSBF (WF-RSBF) method was proposed [27]. This method can estimate ranges of multiple sources and suppress interference with directions different from that of the target.…”

Section: Introductionmentioning

confidence: 99%

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

Li,

Wu,

Guo

et al. 2023

JMSE

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Based on the interference spectrogram in the element–frequency domain using the data measured by the horizontal linear array, the source range can be estimated through the striation-based beamforming (SBF) method and its variants. Estimation of the striation slope is the basis for these ranging methods. But in practical scenarios, the tonal interferences and other noise make it difficult to estimate the slope. In this paper, we proposed a two-dimensional low-pass filtering method after the two-dimensional discrete Fourier transform (2D-DFT) of the element–frequency domain spectrogram. The signals can be separated from the interference and noise using this filter. For the linear frequency-modulated signal without a known waveform, we also proposed an extraction and phase compensation method based on the time–frequency spectrogram, and the acoustic data obtained can be used for source ranging. The experimental results indicate that the methods proposed are feasible.

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Section: Introductionmentioning

confidence: 99%

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

Li,

Wu,

Guo

et al. 2023

JMSE

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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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Prefiltered Striation-Based Beamforming for Range Estimation of Multiple Sources

Cited by 3 publications

References 28 publications

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

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

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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