Footprint Size of a Helicopter-Borne Electromagnetic Induction Sounding System Versus Antenna Altitude

Abstract

Helicopter-towed electromagnetic induction sounding systems have recently been used for the remote measurement of sea-ice thickness and shallow sea bathymetry. An inherent aspect of this sensing technology is the large area, the footprint, over which an individual sounding is made. This report gives an overview of previous footprint size assessments and presents new footprint size estimates determined from sea ice survey data and analytical calculations. All footprint determinations were found to be in reasonable agreement. For a vertical coaxial coil antenna arrangement the apparent footprint diameter was found to be about 1.25 times the antenna height above the conductive surface, and for a horizontal coplanar coil configuration the ratio is about 3.75 times the antenna height. HEM footprint size, Ice, Remote sensing, HEM induction sounding, Remote measurement,

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1993
Accession Number
ADA270468

Entities

People

  • Austin Kovacs
  • Clyde J. Bergeron Jr.
  • J. S. Holladay

Organizations

  • Cold Regions Research and Engineering Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Agreements
  • Altitude
  • Cold Regions
  • Current Density
  • Diameters
  • Electromagnetic Fields
  • Electromagnetic Induction
  • Engineering
  • Flight Speeds
  • Geography
  • Helicopters
  • Ice
  • Measurement
  • Sea Ice
  • Test And Evaluation
  • Thickness
  • Two Dimensional

Fields of Study

  • Environmental science

Readers

  • Atmospheric Remote Sensing.
  • Electrical Engineering
  • Maritime Combat Support and Expeditionary Logistics.