Inversion in shallow-water using the WKB modal condition

Author

Shang, E.C. ; Wang, Y.Y. ; Sun, Shaobo

Author_Institution

Cooperative Inst. for Res. in Environ. Sci., Colorado Univ., Boulder, CO, USA

Volume

21

Issue

4

fYear

1996

fDate

10/1/1996 12:00:00 AM

Firstpage

432

Lastpage

439

Abstract

In this paper, we propose an efficient scheme for extracting the complex bottom reflection coefficient (phase and amplitude) in a shallow water waveguide by using the WKB modal condition. The input data are the measured modal wavenumber (k_m) and the modal attenuation (β_m). The main advantages of this scheme are: 1) it is efficient, because there are no replica calculations as in the conventional matched field processing (MFP) scheme, 2) the inverted error induced by the “noise” of the contaminated data can be estimated analytically, and 3) the impact of the environmental (SSP) mismatch can also be estimated analytically. Numerical simulations illustrate that the proposed scheme works well in different scenarios of shallow water waveguides

Keywords

acoustic signal processing; acoustic wave reflection; geophysical signal processing; measurement errors; numerical analysis; oceanographic techniques; seafloor phenomena; simulation; underwater sound; WKB modal condition; amplitude; complex bottom reflection coefficient; contaminated data; environmental mismatch; inverted error; matched field processing; measured modal wavenumber; modal attenuation; noise; numerical simulation; phase; replica calculations; shallow water waveguide; Acoustic reflection; Acoustic waveguides; Attenuation; Data mining; Numerical simulation; Oceans; Pollution measurement; Sea measurements; Sun; Water;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.544054

Filename

544054