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Bottom parameter estimation using close range ship noise and a short aperture vector sensor array

Journal of Acoustical Society of America


Y. Wu, yqwu_nudt(at)163.com
Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha 410073, P.R. China
P. Felisberto, pfelis(at)ualg.pt
S.M. Jesus, sjesus(at)ualg.pt
and A.B. Santos, absantos(at)ualg.pt
LARSyS, University of Algarve, Campus de Gambelas, PT-8005-139 Faro, Portugal

Comments: download pdf (not yet available).
Ref.: submitted to J. Acoust. Soc. Am. June 2016.

Abstract:
Bottom parameters are inverted from ship self-noise measured on a short vertical array of vector sensors which was suspended from the stern of the vessel. The ship engines ran for a few seconds every few minutes under control of the dynamic positioning system to hold the vessel at a fixed position. By cross-correlating beams steered to directions of eigenrays, the multipath arrival structure of the ship noise is emphasized even under strong noise and tonal contamination. The correlation peak distribution versus two steered angles is used for inferring the upward and the downward going eigenrays. Two inversion methods are presented. One is to derive bottom reflection coefficients by utilizing the ratios of the of the successive multipath correlation peaks. The other is conducted in the frequency domain by matching the interference pattern of phases of the broadband cross-spectral density matrix, where the source position and the bottom parameters are jointly estimated. Both results are consistent with ground truth.