Simulation of Matched Field Processing Convergence Zones in a Strong Bottom Field.

Abstract

Below 30 Hz the convergence zone energy can be smaller than the bottom reflected energy. Matched field simulations using a normal mode program give narrow, irregular correlation peaks for target vectors taken from the complete field. Target vectors computed using only modes representing convergence zone energy are then processed against the complete acoustic field. A much broader, smoother correlation function is obtained. Target vectors are then constructed that are equivalent to delay and sum beamforming at specified angles. These vectors give correlation functions that resembled those for convergence zone energy, and illustrate the relationship between matched field processing and beamforming. Keywords: Sum beamforming; Target vectors; Convergence zone energy.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1987
Accession Number
ADA191897

Entities

People

  • David F. Gordon

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Fields
  • Amplitude
  • Complex Numbers
  • Convergence
  • Convergence Zones (Sonar)
  • Frequency
  • Numbers
  • Plane Waves
  • Polarity
  • Signal Processing
  • Simulations
  • Sine Waves
  • Sound Pressure
  • Steering
  • Underwater Sound
  • Waves

Fields of Study

  • Engineering

Readers

  • Acoustical Oceanography.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Operations Research