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Geoacoustic inversions and localizations with adaptively beamformed data from a surface ship of opportunity source
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10.1121/1.3257207
/content/asa/journal/jasa/127/1/10.1121/1.3257207
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/1/10.1121/1.3257207

Figures

Image of FIG. 1.
FIG. 1.

(a) HLA location, SSOS track reconstruction, simulated interferer track, and source positions for which data for injected interferers were extracted. North is in the positive direction. Bold line on source track identifies data time segment for localizations. Dotted lines bracket track segment during inversion data. Circles identify source and simulated interferer position at sequence 65 for ambiguity surface construction. (b) HLA geometry for subaperture 1 (circles), subaperture 2 (diamonds), subaperture 3 (triangles), and subaperture 4 (squares).

Image of FIG. 2.
FIG. 2.

Bearing-time display of R/V Longhorn passage: (a) measured data only and (b) with simulated interferer. The time segment bracketed in (a) by horizontal lines was selected for inversion data. Arrows at the top of (a) indicate bearings with seismic profiler activity. Time samples from which data were injected into the inversion data to represent an interferer are indicated by boxes in (a). The dashed lines in (a) and (b) show the source bearing track for which beam spectra were constructed.

Image of FIG. 3.
FIG. 3.

Track beam spectrogram from a four element subaperture for the data segment depicted in Fig. 2(a) for (a) ABF data and (b) CBF data.

Image of FIG. 4.
FIG. 4.

Range-bearing ambiguity surface from (a) ABF and (b) CBF subaperture data at sequence 65. The location of the cost value minimum and the mirror image minimum are designated by white dots.

Image of FIG. 5.
FIG. 5.

Bearings (diamonds) of the cost value minima in the ambiguity surfaces for each sequence from 40 to 140, SSOS and mirror image SSOS track (solid), and interferer and mirror image interferer track (dashed) for (a) ABF data and (b) CBF data.

Image of FIG. 6.
FIG. 6.

Cost distribution minimum envelopes for initial SSOS track (a) range and (b) bearing and for the sound speed ratio for (c) layer 1 and (d) layer 2, obtained from inversions of both the CBF (dash) and ABF (dot) data with no interferers and from inversions of CBF (dash-dot) and ABF (solid) data with two interferers.

Image of FIG. 7.
FIG. 7.

Comparison of measured transmission loss (solid) with transmission loss calculated by a model (dash) with the parameter values from the solution of the inversion of the ABF data at (a) , (b) , (c) , and (d) .

Image of FIG. 8.
FIG. 8.

Measured transmission loss from tow data (dash) compared to transmission loss calculated by a model (solid) with the parameter values from the solution of the inversion of ABF data at (a) and (b) .

Image of FIG. 9.
FIG. 9.

Bearing time display with R/V Longhorn and two sources representing injected interferers replicated to span the inversion data sample.

Image of FIG. 10.
FIG. 10.

Comparison of measured RL (solid) with RL calculated by a model (dash) with the parameter values from the solution of the inversion with two injected interferers for (a) CBF data at , (b) ABF data at , (c) CBF data at , (d) ABF data at , (e) CBF data at , and (f) ABF data at .

Image of FIG. 11.
FIG. 11.

Cost distribution minimum envelopes for initial SSOS (a) range and (b) bearing and for the sound speed ratio for (c) layer 1 and (d) layer 2, obtained from inversions of the CBF (dash-dot) and ABF (solid) data with three interferers present and from inversion of data without interferers for CBF (dash) and ABF (dot) data.

Image of FIG. 12.
FIG. 12.

Comparison of measured RL (solid) with RL calculated by a model (dash) with the parameter values from the solution of the inversion with three injected interferers for (a) CBF data at , (b) ABF data at , (c) CBF data at , (d) ABF data at , (e) CBF data at , and (f) ABF data at .

Tables

Generic image for table
TABLE I.

Source track and three-layer geoacoustic parameter inversion bounds and solutions from CBF and ABF data.

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/content/asa/journal/jasa/127/1/10.1121/1.3257207
2010-01-05
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Geoacoustic inversions and localizations with adaptively beamformed data from a surface ship of opportunity source
http://aip.metastore.ingenta.com/content/asa/journal/jasa/127/1/10.1121/1.3257207
10.1121/1.3257207
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