Reverberation Characteristics by Means of the Principal Components Inverse Method
Abstract
A method of reverberation suppression and characterization, called the Principal Components Inverse (PCI) method, has been used to mathematically characterize 87% to 95% of the reverberation observed during selected ARSRP experiments. The number of principal signal components needed to achieve such an explanation seldom exceeds four, illustrating the fact that, over a time slice of about 1.6 of a second, the observed reverberation is mathematically simple. As a result of its mathematical simplicity, it follows that the reverberation can be explained in terms of only a tow acoustic components at any given time-- possible components which represent reflections from bottom facets. It is of interest to explain the mathematical components in terms of such physical components, and it is also of interest to be able to separate a beamformed acoustic signal into what the PCI method regards as 'reverberation' and 'other.' We have, therefore, used the bistatic scattering strength model (BISSM) to estimate mean reverberation power, and then have used that information to refine the energy threshold used by the PCI method prior to producing such a separation. We have also injected a synthetic reflection from a rectangular plate into existing ARSRP hydrophone data. In this paper, we will first introduce the PCI method and then subsequently discuss our initial attempts at both acoustic component identification and at signal separation. Reverberation, Sonar.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1993
- Accession Number
- ADA275095
Entities
People
- D. W. Tufts
- J. W. Caruthers
- R. R. Slater
Organizations
- United States Naval Research Laboratory