A Method of Reducing Bearing Errors in Horizontal Linear Hydrophone Arrays in Shallow Water,

Abstract

Bearing estimation by means of a horizontal acoustic line array is degraded seriously by the multiple effect caused by dispersion of the field in normal modes. Error-free bearing estimates can be achieved only by means of generalized power estimators that take into account the spatial statistics (i.e. the covariance matrix) as a priori information about the medium. This a priori information is unknown in reality. It has to be substituted either by running a modelling program (e.g. normal mode) or by measurements using a test source. Measurements, however, have to be carried out for all bearings of interest. A method is suggested that uses only one test source at one known direction. The estimated test covariance function is used to calculate a beamformer matrix that can be steered in bearing. Theoretical investigations show that significant reduction of the bearing errors can be achieved. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1980
Accession Number
ADA091388

Entities

People

  • Richard A Klemm

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Waveguides
  • Algorithms
  • Amplitude
  • Climate Change
  • Coefficients
  • Covariance
  • Detection
  • Detectors
  • Equations
  • Errors
  • Estimators
  • Frequency
  • Governments
  • High Resolution
  • Nato
  • Shallow Water

Fields of Study

  • Engineering

Readers

  • Acoustical Oceanography.
  • Phased Array Antenna Design.
  • Regression Analysis.