SUB-SURFACE COMMUNICATIONS.

Abstract

The 12th AGARD symposium on 'sub-surface communications,' brought together reports on two specialised fields: lithospheric propagation and propagation involving water and ice. The electromagnetic phenomena are similar but the discontinuities produce quite different effects. The Earth's crust contains rocks of fairly low conductivity which are found between rocks having a higher conductivity; guides are thus obtained along layers having irregular forms. Sea and ice-caps represent more homogeneous media but attenuation caused by sea water is much greater than that due to the rocks in the lithospheric guides; propagation through ice is possible without too much attenuation, a property which is useful for communicating with a submarine, but may be harmful because of the uncertainty it causes in questions of altimetry. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1966
Accession Number
AD0669768

Entities

Organizations

  • AGARD

Tags

DTIC Thesaurus Topics

  • Altimetry
  • Attenuation
  • Avionics
  • Conductivity
  • Discontinuities
  • Glaciers
  • Ice
  • Sea Water
  • Submarines
  • Uncertainty
  • Water

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Seismology
  • Systems Analysis and Design