Results 21 to 30 of about 101,768 (266)
Sensors, 2019 Direct sequence spread spectrum (DSSS) signals are now widely used in air and underwater acoustic communications. A receiver which does not know the pseudo-random (PN) sequence cannot demodulate the DSSS signal.
Yangjie Wei +3 more
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Improved Velocity Estimation Method for Doppler Sonar Based on Accuracy Evaluation and Selection
Journal of Marine Science and Engineering, 2021 The matched filtering method and the waveform-tracking method cannot maintain optimal velocity estimation performance all of the time. In order to solve this problem, this paper proposes an improved velocity estimation method for Doppler sonar, based on ...
Yongshou Yang, Shiliang Fang
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Remote SensingThis paper proposes a method for visualizing three-dimensional non-uniformly sampled data from multibeam echosounder systems (MBESs), aimed at addressing the requirements of monitoring complex and dynamic underwater flow fields.
Wenjing Cao +5 more
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IEEE Access, 2019 The characterization of wideband underwater acoustic (UWA) multi-path signals is investigated in this paper. The UWA multi-path channel can be considered as a sparse model and it causes changes of the transmitted signal on Doppler factor, time delay, and
Shuxia Huang, Shiliang Fang, Ning Han
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From Informed Independent Vector Extraction to Hybrid Architectures for Target Source Extraction
IEEE Open Journal of Signal ProcessingThis article revises informed independent vector extraction (iIVE) as a framework for connecting model-based blind source extraction (BSE) with deep learning. We introduce the contrast function for iIVE, which is derived by extending IVE with beamforming-
Zbynek Koldovsky +5 more
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Limitations and Performance Analysis of Spherical Sector Harmonics for Sound Field Processing
Applied SciencesDeveloping spherical sector harmonics (SSHs) benefits sound field decomposition and analysis over spherical sector regions. Although SSHs demonstrate potential in the field of spatial audio, a comprehensive investigation into their properties and ...
Hanwen Bi +4 more
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IEEE Access, 2019 With respect to the frequency estimation of a real-valued single-tone, a direct frequency estimation method is proposed to acquire fine-resolution parameter by only utilizing three discrete Fourier transform (DFT) samples around the peak. Inspired by the
Shuai Yao, Qisong Wu, Shiliang Fang
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A Nonlinear Data-Driven Towed Array Shape Estimation Method Using Passive Underwater Acoustic Data
Remote Sensing, 2022 Large-aperture towed linear hydrophone array has been widely used for beamforming-based signal enhancement in passive sonar systems; however, its performance can drastically decrease due to the array distortion caused by rapid tactical maneuvers of the ...
Qisong Wu, Youhai Xu
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Fast algorithms for informed independent component/vector extraction
EURASIP Journal on Advances in Signal ProcessingWe propose new and efficient algorithms for semi-blind source extraction derived from the well-known FastICA for independent component analysis (ICA). The algorithms assume independence of the source of interest (SOI) and other signals in the mixture and
Zbyněk Koldovský +4 more
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Journal of Marine Science and Engineering, 2021 For tackling the challenge of in-time searching a sea-crashed plane, it is critical to develop a convenient and reliable detector for the underwater beacon signal. In the application of signal detection, a conventional detector such as linear correlation
Shuai Yao, Yinjia Liu
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