Accession Number:

ADA633509

Title:

Statistical Properties of the Acoustic Field in Inhomogeneous Oceanic Environments - Team Overview

Descriptive Note:

Corporate Author:

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION BOULDER CO ENVIRONMENTAL TECHNOLOGY LAB

Personal Author(s):

Report Date:

2002-09-30

Pagination or Media Count:

7.0

Abstract:

LONG-TERM GOALS. To develop an effective method of description of statistical properties of acoustical signals and calculation of false alarm rate for a given probability distribution of locations of acoustic sources in space. To quantify the degree to which uncertainty in the knowledge of cross-range variation of environmental parameters and their variation in time or purely statistical information on the variations degrades the ability to detect, locate, and track targets acoustically. OBJECTIVES. 1. To develop an effective numerical algorithm of calculation of second statistical moments of the acoustic signals measured by a set of receivers located on sea bottom or arbitrarily distributed in space for inhomogeneous ocean waveguide including the case of uneven bottom in terms of probability distributions of source location. 2. To investigate probability distributions of acoustical signals for typical environments including both deep water and littoral cases. 3. To develop an efficient formalism of transferring uncertainty in the 4-D spatial-temporal fields of environmental parameters into uncertainties of observable acoustic quantities. 4. To quantify the amount of environmental information necessary to achieve a specified accuracy of acoustic field modeling and to determine, for various nearshore hydrodynamic processes of interest, when 2-D as opposed to 3-D and 4-D environmental and propagation models are acceptable. 5. To develop a numerical algorithm for predicting statistical moments of acoustic signals in underwater waveguides with horizontally-inhomogeneous and time-dependent parameters.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE