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Title: Footprint size of a helicopter-borne electromagnetic induction sounding system versus antenna altitude
Authors: Naval Research Laboratory (U.S.)
United States. Coast Guard
University of New Orleans
Geonex-Aerodat Inc.
Kovacs, Austin
Holladay, J. Scott (John Scott), 1955-
Bergeron, Clyde J.
Keywords: HEM footprint size
HEM induction sounding
Electromagnetic induction
Remote sensing
Remote measurement
Sea ice
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: CRREL report ; 93-12.
Description: CRREL Report
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.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:CRREL Report

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