Extremely Low Frequency (ELF) Radar (Active Magnetic Anomaly Detection)

Abstract

This report explores the possibility that an extremely low frequency (ELF) radar could be built to detect submerged submarines at militarily significant distances. Two ELF sources are considered: (1) a large-area of copper wire wrapped around an aircraft (wingtip to tail to wingtip to nose to wingtip) through which a large alternating current would be passed and (2) a rotating superconducting electromagnet, which might be mounted on a ship or an aircraft. Factors influencing the choice of frequency, propagation of ELF waves in sea water, conflicting desiderata, calculated signal strengths, and receiver sensitivity requirements are considered. It is concluded that these approaches are not feasible.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1989
Accession Number
AD1011948

Entities

People

  • Paul M. Moser

Tags

Communities of Interest

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

DTIC Thesaurus Topics

  • Aircrafts
  • Alternating Current
  • Detection
  • Detectors
  • Electromagnetic Fields
  • Electromagnetic Radiation
  • Electromagnets
  • Frequency
  • Maglev
  • Magnetic Anomaly Detection
  • Magnetic Fields
  • Magnetic Moments
  • Magnetometers
  • Radiation
  • Scattering
  • Sea Water
  • Submarines

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Superconducting Magnet Technology