1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Broadband source localization using horizontal-beam acoustic intensity striations
Rent:
Rent this article for
USD
10.1121/1.3257211
/content/asa/journal/jasa/127/1/10.1121/1.3257211
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/1/10.1121/1.3257211
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Geometry of a moving source and a fixed horizontal receiving array considered in the coherent processing.

Image of FIG. 2.
FIG. 2.

Simulated LOFARgrams for range-independent bathymetry compared to theoretical predictions made using Eq. (26) for different depths of source and receiving array: (a) source depth and receiver depth , (b) source depth and receiver depth , and (c) source depth and receiver depth .

Image of FIG. 3.
FIG. 3.

Simulated LOFARgrams with different SNRs and calculated total variances in parameter space. Estimated trajectories corresponding to the parameters with maximum total variance are also shown on the LOFARgrams (solid lines): (a) (same as [Fig. 2(a)]), (b) , and (c) .

Image of FIG. 4.
FIG. 4.

(a) Simulated LOFARgram for two moving source and (b) calculated total variances assuming that is known a priori.

Image of FIG. 5.
FIG. 5.

Simulated LOFARgrams with different bottom slope and calculated total variances in parameter space. Estimated trajectories for time window corresponding to value with maximum total variance are also shown on the LOFARgrams (solid lines). (a) Bottom slope and (b) bottom slope .

Image of FIG. 6.
FIG. 6.

Geometry of fixed vertical and horizontal receiver arrays and the bathymetry map of the experimental area.

Image of FIG. 7.
FIG. 7.

Measured ambient noise level at one element of the HLA. Two noise peaks corresponding to two merchant ships (Ship-A and Ship-B) are also shown.

Image of FIG. 8.
FIG. 8.

LOFARgrams calculated from the HLA beam outputs: (a) Ship-A, (b) Ship-B, and corresponding beam-time records: (c) Ship-A, (d) Ship-B, and (e) bearing angles of two moving ships with respect to one horizontal and three vertical fixed receivers.

Image of FIG. 9.
FIG. 9.

Measured beam-time records: (a) Ship-A, (c) Ship-B, and corresponding Hough transform outputs: (b) Ship-A and (d) Ship-B. Estimated beam-time curves corresponding to the parameters with maximum Hough transform output also shown on the BTRs (white dashed lines).

Image of FIG. 10.
FIG. 10.

(a) Ship-A LOFARgram calculated from the HLA beam output and (b) corresponding total variances in parameter space. Estimated trajectories for time window (solid lines) and corresponding to values with maximum total variance (solid line with circle symbols) are also shown.

Image of FIG. 11.
FIG. 11.

(a) Ship-B LOFARgram calculated from the HLA beam output and (b) corresponding total variances in parameter space. The estimated trajectories for time window (solid lines) and corresponding values with maximum total variance (dashed lines) are also shown. (c) Ship-B LOFARgram compared with the estimated trajectories (solid lines).

Image of FIG. 12.
FIG. 12.

(a) Geometry of a moving source and two fixed receivers for ship speed and bearing estimation. Measured Ship-A (single receiver) LOFARgrams at (b) VLA1, (c) VLA2, and (d) VLA3 locations.

Image of FIG. 13.
FIG. 13.

(a) Ship-A LOFARgram recorded at the VLA1 and (b) calculated total variances in the parameter space. Estimated trajectories corresponding to the parameters with maximum total variance are also shown on the LOFARgram (solid lines).

Image of FIG. 14.
FIG. 14.

(a) Ship-B LOFARgram recorded at the VLA2 and (b) calculated total variances in parameter space. Estimated trajectories corresponding to the parameters with maximum total variance are also shown on the LOFARgram (solid lines).

Image of FIG. 15.
FIG. 15.

(a) R/V Oceanus LOFARgram calculated from the HLA beamform output and estimated level curves (solid lines) using . (b) Measured bathymetry along the ship track.

Image of FIG. 16.
FIG. 16.

Comparison of R/V Oceanus LOFARgrams by using (a) winter beamformed data, (b) winter single-receiver data, and (c) summer single-receiver data. Estimated level curves (solid lines) by using are also shown for the winter data. (d) Bathymetry along the ship track and source-receiver range measured during the Boundary 2007 experiment.

Loading

Article metrics loading...

/content/asa/journal/jasa/127/1/10.1121/1.3257211
2010-01-05
2014-04-17
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Broadband source localization using horizontal-beam acoustic intensity striations
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/1/10.1121/1.3257211
10.1121/1.3257211
SEARCH_EXPAND_ITEM