Array Performance and Variability at Short Range Near Vestfjorden

Abstract

An experiment was conducted in October 1989 in shallow water near Vestfjorden in support of low frequency active sonar system research at SACLANTCEN. This report addresses some acoustic measurement results from that test related to array performance and variability at short range. The received signal level varied by as much as 10-15 dB across the array on a single ping, as well as from ping to ping. This variability and changes in the multimode arrival structure are shown to be caused by small (1 m) changes in array depth. Average array signal gain degradation is less than 1 dB, so the array performance is nearly perfect, despite moderate tow-ship course variations and an unexpected "hole" in the acoustic field.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1990
Accession Number
AD1114357

Entities

People

  • Donald R. Del Balzo

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustic Detectors
  • Acoustic Fields
  • Acoustic Measurement
  • Active Sonar
  • Arrays
  • Bandwidth
  • Data Sets
  • Degradation
  • Detection
  • Detectors
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Hydrophones
  • Measurement
  • Orientation (Direction)
  • Pressure Gages
  • Repetition Rate
  • Shallow Water
  • Water

Readers

  • Acoustical Oceanography.
  • Phased Array Antenna Design.