Spatial-Gain Improvement Resulting from Left/Right Discriminating Elements of an Underwater Towed Array

Abstract

The improvement in spatial gain of an underwater towed array as a result of left/right discriminating elements is investigated. This is accomplished by simulating the measurement of beam noise in a dynamic shipping distribution for a major ocean basin. Beam-noise measurements by a left/right discriminating array at six locations of various shipping densities are compared with the corresponding measurements by a conventional towed away. Cumulative distribution functions of the beam noise as a function of beamwidth are used as a basis for comparison. The results indicate that the additional spatial gain is non-linear with percentage of observations. It varies from about 2 dB for 80% to about 9 to 12 dB for 10% at some sites. At other sites it is considerably less and in some cases vanishes at the low percentages.

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1981
Accession Number
ADA109419

Entities

People

  • Pietro Zanasca
  • Ronald A. Wagstaff

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Sensors

DTIC Thesaurus Topics

  • Acquisition
  • Ambient Noise
  • Area Coverage
  • Coordinate Systems
  • Dead Reckoning
  • Directional
  • Distribution Functions
  • Equations
  • Frequency
  • Gain
  • Losses
  • Measurement
  • Nato
  • Omnidirectional
  • Orientation (Direction)
  • Three Dimensional
  • Towed Arrays

Readers

  • Acoustical Oceanography.
  • Phased Array Antenna Design.