Underwater sound source with tunable resonator for ocean acoustic tomography

2004 ◽  
Vol 116 (4) ◽  
pp. 2635-2635 ◽  
Author(s):  
Andrey K. Morozov ◽  
Douglas C. Webb
Keyword(s):  
Sound Source ◽  
Acoustic Tomography ◽  
Underwater Sound ◽  
Tunable Resonator ◽  
Ocean Acoustic Tomography

A MODAL INVERSION SCHEME FOR OCEAN ACOUSTIC TOMOGRAPHY

1993 ◽  
Vol 01 (04) ◽  
pp. 395-421 ◽  
Author(s):  
MICHAEL I. TAROUDAKIS ◽  
JOHN S. PAPADAKIS
Keyword(s):  
Normal Mode ◽  
Sound Source ◽  
Compact Support ◽  
Sound Speed ◽  
Initial Guess ◽  
Empirical Orthogonal Functions ◽  
Acoustic Tomography ◽  
Orthogonal Functions ◽  
Vertical Slice ◽  
Ocean Acoustic Tomography

An inversion scheme based on normal-mode representation of the acoustic field is applied in ocean acoustic tomography for a range-dependent reconstruction of the sound speed variations at a vertical slice. The scheme is based on the assumption that modal phase can be measured by suitable mode filtering at some range from the sound source. Two cases have been considered. The first of them makes no use of oceanographic information on the variability to be recovered, while the second one makes use of empirical orthogonal functions (EOFs) that describe sound speed variations in the ocean. The data used in the applications presented in this paper are synthetic ones. It is shown that both modal inversion schemes can be used for the recovery of range-dependent sound speed variations of compact support in the ocean, provided that a range dependent background environment is used to describe an initial guess of the variations. The scheme is more powerful when EOFs are used.

Long‐range propagation tests of a 200‐Hz sound source for ocean acoustic tomography

1994 ◽  
Vol 96 (5) ◽  
pp. 3236-3237
Author(s):  
Toshiaki Nakamura ◽  
Toshio Tsuchiya ◽  
Iwao Nakano ◽  
Toshiyuki Nakanishi ◽  
Ieharu Kaihou ◽  
...  
Keyword(s):  
Long Range ◽  
Sound Source ◽  
Acoustic Tomography ◽  
Ocean Acoustic Tomography

Application of multilayered neural networks to ocean acoustic tomography inversions

1996 ◽  
Vol 3 (4) ◽  
pp. 281-304 ◽  
Author(s):  
Y. Stéphan ◽  
S. Thiria ◽  
F. Badran
Keyword(s):  
Neural Networks ◽  
Acoustic Tomography ◽  
Ocean Acoustic Tomography

Optimum design of the ocean acoustic tomography system for the Sea of Japan

1994 ◽  
Vol 50 (3) ◽  
pp. 281-293 ◽  
Author(s):  
Arata Kaneko ◽  
Gang Yuan ◽  
Noriaki Gohda ◽  
Iwao Nakano
Keyword(s):  
Optimum Design ◽  
Sea Of Japan ◽  
Acoustic Tomography ◽  
The Sea Of Japan ◽  
Tomography System ◽  
Ocean Acoustic Tomography

scholarly journals ENGINEERING OF ACOUSTIC TECHNOLOGY FOR UNDERWATER POSITIONING OBJECT

2018 ◽  
Vol 10 (3) ◽  
pp. 629-637
Author(s):  
Billi Rifa Kusumah ◽  
Indra Jaya ◽  
Henry M. Manik ◽  
. Susilohadi
Keyword(s):  
Control System ◽  
Sound Source ◽  
Arrival Time ◽  
Equation Model ◽  
Control Device ◽  
Electromagnetic Signal ◽  
Positioning System ◽  
Underwater Sound ◽  
Underwater Positioning ◽  
The Difference

Underwater Positioning System (UPS) is a system to track the existence of the position of an object by utilizing the arrival time of the signal measurement. On land, the system uses an electromagnetic signal called GPS. However, because it cannot penetrate water effectively, an acoustic signal is used as an alternative. The purpose of this research is to engineer the control system of data acquisition and underwater acoustic device to measure arrival time (TOA) and apply equation model for underwater sound source positioning system. the effective frequency resonance of the transducer and the hydrophone is at a frequency of 6 kHz. The acquisition control device is able to measure the TOA signal with an error on a digital channel smaller than an analog channel. The difference between the TOA values measured by oscilloscope and acquisition control system is caused by inaccuracy of threshold estimates at the receiver's peak detector circuit. The position of the sound source coordinates obtained from the equation model shows the highest difference in depth point (z) compared to points (x) and (y), caused by the equation model used is limited to four hydrophone units forming a horizontal baseline.

Matched Field Ocean Acoustic Tomography Using Genetic Algorithms

1996 ◽  
pp. 601-606
Author(s):  
Michael I. Taroudakis ◽  
Maria G. Markaki
Keyword(s):  
Genetic Algorithms ◽  
Acoustic Tomography ◽  
Ocean Acoustic Tomography
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