Coherence Estimation of Shallow Water Acoustic Narrowband CW Pulsed Signals

Abstract

Different methods for estimating signal coherence from underwater acoustic data taken in shallow water are compared. Specifically this study details methods to estimate coherence from narrow-band, high-frequency, short pulse length, CW signals that typify the signals used by mine hunting sonars in shallow water environments. Due to the short record length of the received pulses, the spectral frequency resolution was poor using classical Fourier techniques. This motivated alternate approaches for the spectral estimation and coherence estimates. The other methods compared are an autoregressive parametric based approach, harmonic wavelet approach, and concatenation of successive pulses followed by the classical method.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 02, 1996
Accession Number
ADA458823

Entities

People

  • Roger W. Meredith
  • Samuel M. Nagle

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Signals
  • Acoustics
  • Algorithms
  • Autocorrelation
  • Bandwidth
  • Data Sets
  • Frequency
  • Frequency Bands
  • Frequency Shift
  • Military Research
  • Narrowband
  • Power Spectra
  • Repetition Rate
  • Standards
  • Test And Evaluation
  • Two Dimensional
  • Wavelet Transforms

Fields of Study

  • Engineering

Readers

  • Acoustical Oceanography.
  • Statistical inference.
  • Theoretical Analysis.