Moving Ship Tomography in Shallow Water
Abstract
Ocean acoustic tomography (OAT) is a remote sensing technique for large-scale monitoring of the ocean interior (temperature and current), using a modest number of acoustic instrument moorings with sources and receivers (transceivers) mostly in deep water. To enhance the spatial coverage in the horizontal, OAT has been augmented with shipboard receivers to cover larger areas. Nonetheless, its routine usage still is not reality today, especially in shallow water, except for the ocean currents based on reciprocal acoustic transmissions. The major challenge is the requirement for rather expensive acoustic moorings to be maintained and operated simultaneously, along with precise knowledge of relative source/receiver locations all the time and accurate synchronization. In this work, wepropose using a ship radiating broadband noise as a surrogate for a probe source (PS), referred to as moving ship tomography. This is facilitated by blind deconvolution, which provides Green#s functions between vertical receive arrays and the PS of unknown sourcewaveforms. In addition, we will exploit both relative travel times and angles of multipath arrivals observed by vertical receive arrays. Separately, the array tilt due to ocean currents can be estimated by the waveguide invariant while a ship circling around vertical arrays, revealing information about the currents. The proof of concept will be verified by both simulations and previous experimental data collected in shallow water. This abstract is publicly releasable
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2023
- Source ID
- N000142312117
Entities
People
- Hee-chun Song
Organizations
- Office of Naval Research
- United States Navy
- University of California, San Diego