Feasibility Study for an Underwater Detection System

Abstract

The report describes the design and test of a feasibility model of an electromagnetic swimmer detector. Operating at a frequency of 400 KH sub z, this system responded to conductivity changes caused by the presence of a swimmer near three 14 feet dipole antennas. The antenna array was deployed in an area of 140 square feet underwater. Swimmers were detected at ranges up to seven feet above the antenna array. Underwater path loss and antenna impedance measurements are reported.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1974
Accession Number
AD0778157

Entities

People

  • R. W. Masters

Tags

Communities of Interest

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

DTIC Thesaurus Topics

  • Amplifiers
  • Antenna Arrays
  • Antenna Radiation Patterns
  • Antennas
  • Arrays
  • Bodies Of Water
  • Brackish Water
  • Detection
  • Detectors
  • Dipole Antennas
  • Frequency
  • Impedance
  • Measurement
  • Salt Water
  • Test And Evaluation
  • Transmission Lines
  • Water

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Dynamics.