Blar i NTNU Open på forfatter "Dong, Hefeng"
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A method for remote sensing of acoustic ship noise
Coward, Stian (Master thesis, 2013)Ship noise in the ocean due to commercial shipping has gained increased interest in recent years because of its potential impact on marine life and the ocean environment. Hence, rapid methods to estimate the source level ... -
A Study of Radiated Noise From Fishing Vessels
Pettersen, Øystein Solheim (Master thesis, 2017)The oceans are covering most of the earth. The noise levels in the oceans are high, even though most people are ignorant to the fact. Through the increase in anthropogenic noise in the oceans, the ambient noise level is ... -
Acoustic and Elastic wave Exploration and Monitoring using Dense Passive Arrays
Rørstadbotnen, Robin André (Doctoral theses at NTNU;2023:278, Doctoral thesis, 2023)Passive recording systems have become increasingly popular and important in various marine acoustic and geophysics branches. Data from these systems provide valuable information and can be used in various applications, ... -
An adapted eigenvalue-based filter for ocean ambient noise processing
Wu, Guoli; Dong, Hefeng; Ke, Ganpan; Song, Junqiang (Peer reviewed; Journal article, 2020)Accurate approximations of Green’s functions retrieved from the correlations of ambient noise require a homogeneous distribution of random and uncorrelated noise sources. In the real world, the existence of highly coherent, ... -
Blind deconvolution based equalizer for underwater acoustic communications
Siddiqui, Salman Ijaz; Dong, Hefeng (Journal article; Peer reviewed, 2019)Reliable and efficient underwater acoustic communications are challenging problems because of complex underwater channel properties. With the recent advancements in underwater technologies, there is a need for a robust ... -
Characterization of Underwater Acoustic Communication Channels: Statistical Characteristics of the Underwater Multipath Channnels
Boayue, Abraham (Master thesis, 2013)Underwater communication and networking have become very essential both for commer-cial and military purposes. The number of research conducted in this field has increased over the past few decades. The need to communicate ... -
Compensating time variability of the underwater channel for effective underwater acoustic communications
Siddiqui, Salman Ijaz (Doctoral theses at NTNU;2019:300, Doctoral thesis, 2019) -
Design and Implementation of Underwater Acoustic Communication System Based on Frequency-domain Processing
Peng, Bo (Doctoral theses at NTNU;2020:45, Doctoral thesis, 2020) -
Developing experimental skills: A hands-on course in acoustical measurement techniques at the Norwegian University of Science and Technology
Dong, Hefeng; Svensson, U. Peter; Dutilleux, Guillaume; Martin Roman, Sara-Regina; Netland, Tim Cato; Rørstadbotnen, Robin André; Talberg, Andreas Sørbrøden (Peer reviewed; Journal article, 2022)The course “Acoustical Measurement Techniques TTT4250,” offered by the Acoustics Group at the Department of Electronic Systems, Norwegian University of Science and Technology, is a fourth-year course in the specialization ... -
Directive under-water transducer design for Doppler velocity log
Tesaker, Andreas (Master thesis, 2019)En 1 MHz direktiv undervannstransduser for bruk i DVL er designet, simulert, konstruert og testet gjennom målinger i denne oppgaven. Designet følger teorien for en piezoelektrisk disk som opererer i tykkelsesmodi, omsluttet ... -
Effects of sound exposure from a seismic airgun on heart rate, acceleration and depth use in free-swimming Atlantic cod and saithe
Davidsen, Jan Grimsrud; Dong, Hefeng; Linne, Markus; Andersson, Mathias H.; Piper, Adam; Prystay, Tanya S.; Hvam, Eivind B.; Thorstad, Eva Bonsak; Whoriskey, Frederick G.; Cooke, Steven J.; Sjursen, Aslak Darre; Rønning, Lars; Netland, Tim Cato; Hawkins, Anthony D. (Journal article; Peer reviewed, 2019)Recent vegetation changes in arctic-alpine tundra ecosystems may affect several ecosystem processes that regulate microbe and soil functions. Such changes can alter ecosystem carbon (C) cycling with positive feedback to ... -
Effects of water column variations on sound propagation and underwater acoustic communications
Siddiqui, Salman Ijaz; Dong, Hefeng (Journal article; Peer reviewed, 2019)Underwater sound propagation is very sensitive to geometric and environmental variations. The geometric variations are the motion of the source and/or receiver, while the environmental variations are due to surface motion ... -
Estimation of harmonic signatures in underwater noise from small boats
Faltin, Ole Gunnar Mathisen (Master thesis, 2015)This thesis explores underwater noise from small boats. There has been an in- creased focus on anthropogenic noise in the marine environment within the EU in the past years. The focus of the thesis is to study the noise ... -
Experimental assessment of a JANUS-based consensus protocol
Wengle, Johan Emil Hugo; Erstorp, Elias Strandell; Lidström, Viktor; Varagnolo, Damiano; Dong, Hefeng (Journal article; Peer reviewed, 2024)This paper proposes a distributed, JANUS-based protocol that enables an underwater acoustic network to reach consensus on arbitrary local opinions as numeric state variables. An envisioned scenario where nodes shall agree ... -
Experimental Assessment of Different Receiver Structures for Underwater Acoustic Communications over Multipath Channels
Zhang, Guosong; Hovem, Jens Martin; Dong, Hefeng (Journal article; Peer reviewed, 2012)Underwater communication channels are often complicated, and in particular multipath propagation may cause intersymbol interference (ISI). This paper addresses how to remove ISI, and evaluates the performance of three ... -
Extraction of Interface Wave Dispersion Curves from Ocean Ambient Noise
Dong, Hefeng; Wu, Guoli; Ke, Ganpan (Chapter, 2019) -
Feature Selection Based on Principal Component Regression for Underwater Source Localization by Deep Learning
Zhu, Xiaoyu; Dong, Hefeng; Salvo Rossi, Pierluigi; Landrø, Martin (Peer reviewed; Journal article, 2021)Underwater source localization is an important task, especially for real-time operation. Recently, machine learning methods have been combined with supervised learning schemes. This opens new possibilities for underwater ... -
Full-waveform inversion studies
Thomassen, Espen (Master thesis, 2008)In this master thesis, full-waveform inversion (FWI) was applied to a synthetic, and very complex, geological structure containing a salt body. The main objective was to evaluate the capabilities of FWI to estimate velocities ... -
Implementation and Evaluation of a Dispersion Compensation Algorithm for Acoustic Touch Localization
Iversen, Vegard Stornes (Master thesis, 2023)Denne avhandlingen undersøker og implementerer en dispersjons kompensasjons algoritme for akustisk berøringslokalisering på isotrope plater. Studien bygger på en tidligere prosjektoppgave som utforsket berøringslokaliser ... -
An iterative receiver for time-domain oversampled OFDM system over time-varying underwater acoustic channels
Peng, Bo; Dong, Hefeng (Peer reviewed; Journal article, 2021)This paper investigates an iterative receiver for time-domain oversampled orthogonal frequency division multiplexing (OFDM) over time-varying underwater acoustic channels for both single-input, single-output (SISO), ...