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Single-receiver geoacoustic inversion using modal reversal
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Image of FIG. 1.
FIG. 1.

Spectrograms of simulated fields for an impulsive source in a layered waveguide (arbitrary linear scale): (a) Simulated received signal and (b) corresponding warped signal (arbitrary linear scale). The waveguide consists of three isovelocity layers: Water column (, ), sediment layer (, , ) and semi-infinite basement (, ). The source and receiver depths are, respectively, and , and the range is .

Image of FIG. 2.
FIG. 2.

Principle of modal filtering using warping.

Image of FIG. 3.
FIG. 3.

Principle of the criterion computation for a given . Note that the modal reversal operation depends on mode number and on the parameter vector .

Image of FIG. 4.
FIG. 4.

Sensitivity analysis and comparison with dispersion curve inversion. The continuous lines gives the normalized criterion value (corresponding scale is the vertical-left axis), while the dotted line shows the corresponding normalized misfit obtained using dispersion curve inversion (corresponding scale is the vertical-right axis). Each figure corresponds to a single parameter sensitivity: (a) Range, (b) sediment sound speed, (c) sediment density, (d) sediment width, (e) basement sound speed, and (f) basement density.

Image of FIG. 5.
FIG. 5.

Estimation error and standard deviation depending on the SNR: (a) Range, (b) sound speed, and (c) density. Corresponding theoretical values are , , and .

Image of FIG. 6.
FIG. 6.

Spectrograms of experimental signals: (a) Received signal and (b) corresponding warped signal (arbitrary linear scale).

Image of FIG. 7.
FIG. 7.

Geoacoustic model of the environment. The sound speed profile in the water column corresponds to the in situ measurement, while the bottom sound speeds are estimated values from the literature (Ref. 25).

Image of FIG. 8.
FIG. 8.

Experimental inversion results: Normalized criterion value (black dots) depending on (a) range, (b) sediment sound speed, (c) sediment density, (d) later width, (e) basement sound speed, and (f) basement density. The vertical gray lines give the final estimated value of each parameter.


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Summary of MRI results and comparison with DCI results.a


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Single-receiver geoacoustic inversion using modal reversal