System and Method for Calculating the Directivity Index of a Passive Acoustic Array

Abstract

A software system and method is presented that calculates the sensor directivity at all spatial angles, and stores these values in a two dimensional matrix. These values are then used as additional "weighting" coefficients in the equation for the pressure detected by an array of directive sensors. The azimuthal and polar angles of a particular sensor normal vector are used to "rotate" the sensor directivity matrix to account for the angular orientation of each sensor within the array. The software system receives as input sensor and array geometry, shading functions, sensor shape, array structure baffling, steering, and shading. A sensor can have the shape of a point, line, plane, volume, baffled ring, or circular plane piston. The sensors within the array can either be baffled by the array structure or retain their free field directivity response, and array as a whole can have steering or no steering.

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Document Details

Document Type
Technical Report
Publication Date
Jul 27, 2007
Accession Number
ADD020303

Entities

People

  • John R. Welch

Organizations

  • United States Department of the Navy

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Arrays
  • Acoustic Detectors
  • Arrays
  • Coefficients
  • Computer Programs
  • Coordinate Systems
  • Diameters
  • Directives
  • Equations
  • Free Field
  • Frequency
  • Geometry
  • Graphical User Interface
  • Orientation (Direction)
  • Shape
  • Two Dimensional
  • User Interface

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Image Processing and Computer Vision.
  • Robotics and Automation.