The Effect of Hydrophone Configuration on the Directivity Index of a Line Array

Abstract

The directivity index, or DI, is a special case of array gain for the condition when the signal is a plane wave and the noise field is isotropic. It is a frequently used parameter for the assessment of an array's utility. As a part of the Broadband Passive Sonar Signal Processing program, the directivity indices for three arrays have been investigated as functions of both frequency and steering angle. All three arrays each have 32 hydrophones and a line aperture on the order of 300 meters, but each array has different hydrophone spacings. The three hydrophone spacings are (1) asymmetric geometric taper (2) symmetric geometric taper, and (3) equi-spaced. This memorandum describes the principal results of the DI study.

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Document Details

Document Type
Technical Report
Publication Date
Jun 11, 1984
Accession Number
ADA143103

Entities

People

  • Peter D. Herstein

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Phenomena
  • Acoustics
  • Buildings And Structures
  • Computational Science
  • Coordinate Systems
  • Far Field
  • Frequency
  • Hydrophones
  • Libraries
  • Mathematics
  • Passive Sonar
  • Plane Waves
  • Research Facilities
  • Signal Processing
  • Sonar Signals
  • Steering
  • Underwater Sound

Readers

  • Acoustical Oceanography.
  • Phased Array Antenna Design.

Technology Areas

  • Space