Description of the Lincoln Laboratory Wideband ELF Noise Recording Systems

Abstract

The report describes the systems used to record wideband (12 Hz - 300 Hz) extremely low frequency (ELF) electromagnetic noise in a number of geographic locations. The first section centers on the analog recording system employed in Florida. Simply stated, analog tapes were recorded and later converted to digital tapes for further processing. Section II describes the 'NAVCOM' system which employed on site digital recording. The final section describes the calibration procedures used to relate the digitalized data to absolute electromagnetic field levels. A distinctive feature of both systems is the care taken to preserve the wide dynamic range of the ELF noise while reducing the amount of man-made interference recorded. Results of analyzing the recorded noise data to optimize communications system performance in this frequency band are described in companion reports.

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Document Details

Document Type
Technical Report
Publication Date
Apr 14, 1972
Accession Number
AD0743006

Entities

People

  • Donald K. Willim
  • J. Royce Brown
  • James R. Evans

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Computer Programs
  • Dynamic Range
  • Electromagnetic Fields
  • Electronics
  • Electronics Laboratories
  • Extremely Low Frequency
  • Frequency
  • Frequency Bands
  • Impedance
  • Measurement
  • Recording Systems
  • Tape Recorders
  • Tape Recording
  • Vehicles
  • Waves
  • Whip Antennas

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Space/Atmospheric Physics.
  • Systems Analysis and Design