Sound speed profile inversion using a horizontal line array in shallow water

2014 ◽  
Vol 58 (1) ◽  
pp. 1-7 ◽  
Author(s):  
ZhengLin Li ◽  
Li He ◽  
RenHe Zhang ◽  
FengHua Li ◽  
YanXin Yu ◽  
...  
Keyword(s):  
Shallow Water ◽  
Sound Speed ◽  
Horizontal Line ◽  
Speed Profile ◽  
Sound Speed Profile ◽  
Line Array ◽  
Profile Inversion

MATCHED FIELD SOURCE LOCALIZATION WITH A HORIZONTAL LINE ARRAY

1994 ◽  
Vol 02 (03) ◽  
pp. 315-325
Author(s):  
N. R. CHAPMAN ◽  
M. L. YEREMY
Keyword(s):  
Source Localization ◽  
Sound Speed ◽  
Water Environment ◽  
Horizontal Line ◽  
Speed Profile ◽  
Field Source ◽  
Sound Speed Profile ◽  
Line Array ◽  
Localization Performance ◽  
Experimental Geometry

Matched field source localization performance is investigated for a source in aft endfire of a horizontal line array operating in a deep water environment. Simulations are used to investigate the performance for ideal conditions and in the presence of noise. In particular, the effects of uncertainty in experimental geometry and mismatch in sound speed profile are considered. It is shown that the performance is sensitive to the vertical tilt of the array for relatively small tilt angles of less than 5º. However, the horizontal array is robust to mismatch in the gradient of the sound speed profile at the bottom of the water column. The results of the simulations are interpreted in terms of the characteristics of acoustic propagation in the environment.

Sound speed profile inversion by matching acoustic intensity striations in shallow water

2012 ◽  
Author(s):  
Li He ◽  
Zhenglin Li ◽  
Shihong Zhou ◽  
Renhe Zhang ◽  
Fenghua Li
Keyword(s):  
Shallow Water ◽  
Sound Speed ◽  
Speed Profile ◽  
Acoustic Intensity ◽  
Sound Speed Profile ◽  
Profile Inversion

Comparison of Sound Propagation Characteristic between Deep and Shallow Water

2014 ◽  
Vol 577 ◽  
pp. 1198-1201
Author(s):  
Zhang Liang ◽  
Chun Xia Meng ◽  
Hai Tao Xiao
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Sound Speed ◽  
Sound Propagation ◽  
Spherical Wave ◽  
Sound Field ◽  
Propagation Loss ◽  
Speed Profile ◽  
Sound Speed Profile ◽  
Propagation Law

The physical characteristics are compared between shallow and deep water, in physics and acoustics, respectively. There is a specific sound speed profile in deep water, which is different from which in shallow water, resulting in different sound propagation law between them. In this paper, the sound field distributions are simulated under respective typical sound speed profile. The color figures of sound intensity are obtained, in which the horizontal ordinate is distance, and the vertical ordinate is depth. Then we can get some important characteristics of sound propagation. The results show that the seabed boundary is an important influence on sound propagation in shallow water, and sound propagation loss in deep water convergent zone is visibly less than which in spherical wave spreading. We can realize the remote probing using the acoustic phenomenon.

scholarly journals A Volunteer Computing Project for Solving Geoacoustic Inversion Problems

2017 ◽  
Vol 7 (1) ◽  
pp. 363-370
Author(s):  
Oleg Zaikin ◽  
Pavel Petrov ◽  
Mikhail Posypkin ◽  
Vadim Bulavintsev ◽  
Ilya Kurochkin
Keyword(s):  
Inverse Problems ◽  
Shallow Water ◽  
Sound Speed ◽  
Underwater Acoustics ◽  
Volunteer Computing ◽  
Speed Profile ◽  
Geoacoustic Inversion ◽  
Sound Speed Profile ◽  
Profile Reconstruction ◽  
Discretization Grid

AbstractA volunteer computing project aimed at solving computationally hard inverse problems in underwater acoustics is described. This project was used to study the possibilities of the sound speed profile reconstruction in a shallow-water waveguide using a dispersion-based geoacoustic inversion scheme. The computational capabilities provided by the project allowed us to investigate the accuracy of the inversion for different mesh sizes of the sound speed profile discretization grid. This problem suits well for volunteer computing because it can be easily decomposed into independent simpler subproblems.

Simulation for Range Prediction of Active Sonar in Shallow Water

2013 ◽  
Vol 385-386 ◽  
pp. 514-517 ◽  
Author(s):  
Liang Zhang ◽  
Chun Xia Meng ◽  
Jian Na
Keyword(s):  
Shallow Water ◽  
Sound Speed ◽  
Sound Absorption ◽  
Sound Propagation ◽  
Propagation Characteristic ◽  
Water Medium ◽  
Speed Profile ◽  
Long Distance ◽  
Sound Speed Profile ◽  
Active Sonar

In shallow water the acoustic wave from ambient noise sources carries a large number of environment information based on the complicated reflection both on the surface and seabed interface. The sound speed profile is one of the influencing factors of sound propagation characteristic, while for a long distance the sound absorption coefficient of water medium has an important significance to propagation range. The simulation results show that in shallow water sound absorption of seabed, sound speed profile and sound absorption of water were taken into account, then range prediction of active sonar can be exactly obtained using normal-mode propagation.

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