Accession Number:

ADA633508

Title:

Time-reversing Array Focusing in Shallow Waters

Descriptive Note:

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING AND APPLIED MECHANICS

Personal Author(s):

Report Date:

1997-09-30

Pagination or Media Count:

4.0

Abstract:

LONG-TERM GOALS. The long term goals of this project are i to predict and understand time reversing array TRA retrofocus size and longevity in a shallow water acoustic environments based on acoustic, geometrical, and environmental parameters, and ii to deduce the effectiveness of using a TRA for monitoring andor determining the acoustic properties of unknown environments. SCIENTIFIC OBJECTIVES. This project seeks to determine TRA retrofocus size and longevity in the presence of i dynamic random shallow-water internal-wave volume refraction, ii dynamic random surface scattering, iii deterministic soliton internal-wave volume refraction, and iv typical shallow-water wave guides. In particular, the influence of acoustic frequency, array size, source array range, and dynamic mulitpath sound-channel structure on time-reversing array retrofocusing is not completely understood. The challenge is to separate the various influences and impacts of propagation complexities bottom losses, water-column dynamics, surface scattering, etc. so that the phenomena primarily responsible for TRA retrofocusing limitations can be identified.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE