Time-reversing Array Focusing in Shallow Waters
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 and/or 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1997
- Accession Number
- ADA633508
Entities
People
- David R. Dowling
Organizations
- University of Michigan