Blar i NTNU Open på forfatter "Hovem, Jens Martin"
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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 communication for use in underwater sensor networks
Haug, Ole Trygve (Master thesis, 2009)In this study an underwater acoustic communications system has been simulated. The simulations has been performed through use of a simulation program called EasyPLR that is based on the PlaneRay propagation model. In the ... -
Bathymetric and seasonal effects on the propagation of airgun signals to long distances in the Ocean
Tronstad, Tron; Hovem, Jens Martin (Chapter, 2011)Marine seismic exploration uses air guns or air gun arrays to generate high energy, short duration acoustic pulses deep into the ocean floor but some of the seismic/acoustic energy remains in the water column and can ... -
Estimation of Size Distribution and Abundance of Zooplankton based on Measured Acoustic Backscattered Data
Storetvedt, Kjetil (Master thesis, 2006)In the later years the scientist community has bin investigating the possibility of using zoo plankton as a commercial resource. It is therefore of interest to investigate the size distribution and abundance of zoo plankton. ... -
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 ... -
Processing of Sub-Bottom Profiler Data using Seismic Migration Methods
Bentsen, Stian (Master thesis, 2006)This master thesis on processing of Sub-Bottom Profiler data has the intention to improve imaging and detection of sub-bottom structures and anomalies. Two seismic migration methods have been exploited to reposition the ... -
Programming graphic card for fast calculation of sound field in marine acoustics
Haugehåtveit, Olav (Master thesis, 2006)Commodity computer graphics chips are probably today’s most powerful computational hardware one can buy for money. These chips, known generically as Graphics Processing Units or GPUs, has in recent years evolved from ... -
Programming graphic card for fast calculation of sound field in marine acoustics
Haugehåtveit, Olav (Master thesis, 2006)Commodity computer graphics chips are probably today’s most powerful computational hardware one can buy for money. These chips, known generically as Graphics Processing Units or GPUs, has in recent years evolved from ... -
Propagation of anthropogenic noise in the ocean
Hovem, Jens Martin; Tronstad, Tron (Chapter, 2012)Acoustic modeling technique is used to study long range propagation of airgun signals with emphasis on the low frequencies having impact on fish species of commercial interest, the frequency range from 25 Hz to 300 Hz. The ... -
Realization of Underwater Acoustic Networks.
Riksfjord, Håkon (Master thesis, 2009)This work contains a study of underwater acoustic networks. The concept of underwater acoustic networks has been presented with its benefits and drawbacks. An overview of the marine research areas oceanography, seismology, ... -
Studie av bølgeutbredelseseffekter som en funksjon av hastighetsprofilen
Hoff, Fredrik (Master thesis, 2006)Formålet med denne rapporten har vært å studere variasjonen i signalmottakelsen på lange hydrofonkabler, slike variasjoner fører til feil i posisjonsbestemmelsen for hver enkelt hydrofon dersom en ikke blir tatt tilstekkelig ... -
Understanding ocean acoustics by eigenray analysis
Hovem, Jens Martin; Dong, Hefeng (Journal article; Peer reviewed, 2019)Acoustics is important for all underwater systems for object detection, classification, surveillance systems, and communication. However, underwater acoustics is often difficult to understand, and even the most carefully ... -
Underwater Communications: An OFDM-system for Underwater Communications
Gregersen, Svein Erik Søndervik (Master thesis, 2007)In the fall 2006 NTNU (The Norwegian University and Science and Technology) initiated a strategic project in cooperations with SINTEF where the aim is to gain more knowledge about underwater acoustic communications. This ...