Exploitation of the CTBTO Hydro-acoustic array data bases for ocean ambient noise research
Abstract
Goals: a) Investigation of the spatial coverage variation of sound channel sensors with change in noise source location and intensity b) Investigation of the variation with time, of ambient noise properties that have the potential to reflect global oceanic change Technical Approach: Continued collection and storage of the data bases from Wake Island, Ascension Island and Diego Garcia CTBTO sites. Usage of these data bases to investigate temporal behavior, source variation and location influence. (It should be noted that additional CTBTO sites can easily be acquired for analysis or to exploit a unique feature (Ref 1 and 2) of the local ambient noise for Naval purposes. The process of transferring the data bases to a local site from the USAF main data bank location has become an efficient routine.) Recent analysis has centered around the use of both a frequency Correlation Matrix (CM) and a spectrum CM. The former averages over time, the spectra of interest; the latter the spectral content at specific times (Ref 3). The technique provides a useful description of the spectral structure and the time behavior of sources of oceanic ambient noise. The descriptions are specific enough to consider using them as “eigenfunctions” of the ambient noise, which is one approach planned for this effort. The second approach is focused on exploiting the Correlation Matrix and developing it as a tool for the Fleet to execute sonar-based operations. This work has two parts: a) Development of the ambient noise correlation matrix as a predictive tool for fleet use to plan acoustic based operations b) Use of the ambient noise correlation matrix as a quantitative tool to describe background noise conditions in a manner that allows operational exploitation
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 23, 2018
- Source ID
- N000141812063
Entities
People
- David Bradley
Organizations
- Office of Naval Research
- United States Navy
- University System of New Hampshire