Normal mode wave-number estimation using a Towed array

Chouhan, Harish M. ; Anand, G. V. (1993) Normal mode wave-number estimation using a Towed array Journal of the Acoustical Society of America, 93 (4). pp. 1807-1814. ISSN 0001-4966

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In the analysis of the null-steering technique of normal mode filtering presented by the authors previously [H. M. Chouhan and G. V. Anand, J. Acoust. Soc. Am. 89, 735-744 (1991)], it was assumed that the modal wave numbers km are known a priori. In practice, the waveguide parameters upon which the modal wave numbers depend are normally not known and are difficult to measure accurately. In order to use the null-steering technique of mode filtering, or in applications such as source localization and waveguide characterization, it is necessary to estimate the modal wave numbers. An estimation procedure using a towed horizontal line array is presented in this article. The method entails eigendecomposition of the range-averaged array signal correlation matrix. Range-averaging effectively decorrelates the normal mode signals and enables the use of high-resolution spectral estimation techniques such as MUSIC for estimating the modal wave numbers. Simulation results for the Pekeris model of the ocean are presented.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Normal-mode Analysis; Arrays; Acoustic Waveguides; Seas; Correlation Detection; Simulation
ID Code:71979
Deposited On:28 Nov 2011 05:00
Last Modified:28 Nov 2011 05:00

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