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

Internal wave effects on long‐range ocean acoustic tomography

1995 ◽  
Vol 97 (5) ◽  
pp. 3235-3235
Author(s):  
M. A. Wolfson ◽  
J. L. Spiesberger ◽  
F. D. Tappert
Keyword(s):  
Internal Wave ◽  
Long Range ◽  
Acoustic Tomography ◽  
Wave Effects ◽  
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.

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
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