The Detection of ULF-ELF Emissions from Moving Ships

Abstract

A series of measurements of the EM emissions from moving merchant ships were made. Analysis of the recorded signals shows that they correspond closely to the fields excited by a horizontal electric dipole source moving with the ship. Also recorded were the levels of the natural EM background. Using these levels the maximum ranges at which a matched filter could extract the ship emission signals are derived. Also considered are the effect of electromagnetic noises generated by ocean surface waves moving the conductive sea water in the presence of the geomagnetic field.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1977
Accession Number
ADA037830

Entities

People

  • F. X. Bostick Jr.
  • H. W. Smith
  • J. E. Boehl

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

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

DTIC Thesaurus Topics

  • Detection
  • Detectors
  • Electric Fields
  • Electromagnetic Fields
  • Emission
  • Filters
  • Geophysics
  • Magnetic Fields
  • Matched Filters
  • Measurement
  • Plastic Explosives
  • Sea Water
  • Surface Waves
  • Telluric Currents
  • Voltage
  • Water
  • Waves

Fields of Study

  • Engineering
  • Environmental science

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Naval Architecture and Marine Engineering.
  • Space/Atmospheric Physics.