Accession Number:

ADA610158

Title:

Acoustic Tomography With Navy Sonars

Descriptive Note:

Annual rept.

Corporate Author:

SCIENTIFIC INNOVATIONS INC RADNOR PA

Personal Author(s):

Report Date:

2000-09-30

Pagination or Media Count:

4.0

Abstract:

The long-term goal of this contract is to determine if a wide variety of Navy sonars can be used to map the sound speed field by means of acoustical tomography for use in research and surveillance. The Sound Surveillance Systems SOSUS have traditionally been used for obtaining acoustical tomography data. The Navy has many more sonars than these, and their use should significantly enhance the accuracy and resolution of the maps. We will utilize different types of active and passive Navy sonars, and electronically controlled acoustic sources deployed by scientists, to determine if Navy sonars can be used to make tomographic maps using a Kalman filter. In particular, we will utilize data from towed arrays, which should provide a synthetic aperture for increasing the resolution and accuracy of tomographic maps Spiesberger et al., 1997. We need to determine if the data from towed arrays have sufficient signal-to-noise ratios, and if the acoustic paths can be identified from a model, as has been demonstrated with data collected at SOSUS stations Spiesberger and Metzger, 1992, Norris et al., 1998. Our objective is to compare tomographic maps from towed arrays with those from only SOSUS stations in order to compare the advantages and disadvantages of using towed arrays.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Statistics and Probability
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE