Passive bottom loss estimation using compact arrays
Abstract
Project Summary/Abstract The purpose of this research is to develop a better understanding of the physics of the seabed and ocean ambient noise field. This understanding will lead to better estimates the seabed bottom loss which will be particularly relevant when using compact arrays that can be deployed either from a small buoy or from an autonomous underwater vehicle (AUV). There are numerous Navy and commercial efforts underway to develop a variety of AUV’s and these are potential platforms for novel sensor designs. Bottom loss is an important parameter for sonar performance prediction and can be extremely complicated depending on the location and the acoustic frequency. Historically, bottom loss has been measured or estimated and archived for use in Navy tactical decision aids. These measurements have involved Navy T-AGS ships, which are expensive to operate and severely limit the locations that can be surveyed. Bottom loss is usually measured using both a hydrophone (or array of hydrophones) and an acoustic sound source. This proposed work will use a passive approach taking advantage of the ocean ambient noise field as the source of sound. The challenge for this research is to better understand the physics of the seabed and the ambient noise field to develop possible sensing methods that can be applied to compact arrays.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512035
Entities
People
- Naomi Levy
Organizations
- Office of Naval Research
- Portland State University
- United States Navy