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Range dependent sediment sound speed profile measurements using the image source method
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10.1121/1.4809681
/content/asa/journal/jasa/134/1/10.1121/1.4809681
http://aip.metastore.ingenta.com/content/asa/journal/jasa/134/1/10.1121/1.4809681
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sketch of the experiment. The AUV altitude above the seabed is about 12 m and the receiving array is 32 elements with a spacing of 1.05 m, with the first element 10.38 m behind the source.

Image of FIG. 2.
FIG. 2.

Example of a recorded signal of the first hydrophone of the array.

Image of FIG. 3.
FIG. 3.

Modeling of the seafloor with image sources: (a) original configuration, (b) the equivalent system. (c) Image sources not aligned on the vertical source axis due to the water sound-speed everywhere assumption.

Image of FIG. 4.
FIG. 4.

Refracted ray in a medium with known layer sound speeds and thicknesses.

Image of FIG. 5.
FIG. 5.

Sketch of the variables used.

Image of FIG. 6.
FIG. 6.

(Color online) Image sources map computed with hydrophones 18 to 32 for: (a) (in dB), (b) . The white diamond corresponds to the real source location and the black points correspond to the hydrophone locations. The dashed curves correspond to the limits of the depth of field (Sec. IV C ).

Image of FIG. 7.
FIG. 7.

Distances between the source and the hydrophones and distances between the first image and the hydrophones.

Image of FIG. 8.
FIG. 8.

Example of a recovered array shape (circle). The diamond is the real source coordinate. The vertical exaggeration of the array shape is about 10:1.

Image of FIG. 9.
FIG. 9.

(Color online) Image sources map computed with hydrophones 18 to 32 for (a) a linear array, (b) the corrected array shape. The white diamond corresponds to the real source location and the black points correspond to the hydrophone locations.

Image of FIG. 10.
FIG. 10.

(Color online) (a) SSP obtained with the subarrays composed of hydrophones 1 to 15, 2 to 16,… and 18 to 32 for one transmission of the source. (b) SSP obtained for 20 transmissions of the source with the subarray composed of hydrophones 18 to 32. (c) Averaged SSP over the subarrays for 20 transmissions of the source. (d) Averaged SSP over 20 transmissions for the subarrays composed of hydrophones 1 to 15, 2 to 16,… and 18 to 32.

Image of FIG. 11.
FIG. 11.

(Color online) (a) SSP obtained with the subarray composed of hydrophones 18 to 32 for 1 transmission over 4 on the 2693 transmissions of the source. The color scale is fixed from 1450 to 1700 m/s. (b) Filtered SSP with the subarray composed of hydrophones 18 to 32 for the 2693 transmissions of the source. (c) Standard deviation of the filtered SSP from the subarrays composed of hydrophones 6 to 20, 7 to 21… and 18 to 32. (d) Standard deviation of the filtered SSP from the subarrays composed of hydrophones 6 to 20, 7 to 21… and 18 to 32.

Image of FIG. 12.
FIG. 12.

(Color online) (a) SSP obtained by averaging the filtered SSP from the subarrays composed of hydrophones 6 to 20, 7 to 21… and 18 to 32. The black points correspond to the interface depths found at each transmission of the source. (b) Seismic data along nearly the same track as the AUV. At the track start the two tracks are within a few tens of meters; at the track end the separation is roughly 800 m.

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/content/asa/journal/jasa/134/1/10.1121/1.4809681
2013-07-11
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Range dependent sediment sound speed profile measurements using the image source method
http://aip.metastore.ingenta.com/content/asa/journal/jasa/134/1/10.1121/1.4809681
10.1121/1.4809681
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