Fundamental Mode Approach to Forward Problem Solutions in EMI Scattering -- Inferring Fundamental Solutions from Training Data

Electromagnetic induction is the leading technology for discrimination of subsurface metallic targets such as unexploded ordnance (UXO). The cleanup problem requires solution of remote sensing inverse problem inevitably based on some very fast forward algorithms for calculating EMI. The forward mode...

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Bibliographic Details
Main Authors: Sun, K., O'Neill, K., Shubitidze, F., Shamatava, I., Paulsen, K. D.
Other Authors: DARTMOUTH COLL HANOVER NH
Format: Text
Language:English
Published: 2004
Subjects:
Electricity and Magnetism
Radiofrequency Wave Propagation
Statistics and Probability
*ELECTROMAGNETIC SCATTERING
*SOLUTIONS(GENERAL)
*ELECTROMAGNETIC INDUCTION
ALGORITHMS
LEAST SQUARES METHOD
UNEXPLODED AMMUNITION
INVERSE PROBLEMS
REMOTE DETECTION
SYMPOSIA
EXCITATION
TARGET DISCRIMINATION
FUNDAMENTAL MODES
COMPONENT REPORTS
Cold Regions Research and Engineering Laboratory
Online Access:http://www.dtic.mil/docs/citations/ADA438917
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA438917
Description
Summary:Electromagnetic induction is the leading technology for discrimination of subsurface metallic targets such as unexploded ordnance (UXO). The cleanup problem requires solution of remote sensing inverse problem inevitably based on some very fast forward algorithms for calculating EMI. The forward model must determine responses of arbitrarily complicated metallic objects. Here a very fast and complete forward solution system is presented, based on fundamental mode excitations. For a given target (or a set of targets), the EMI responses to fundamental modes are obtained from training data and saved. Any realistic excitation field is then decomposed into a limited number of constituent fundamental modes and the scatterer's EMI response is obtained by superposition of the fundamental mode solutions. In this paper we define the fundamental excitations explicitly and consider their rationale; show how to construct any particular solutions from solutions to the fundamental excitations; and focus particularly on how to obtain, retain, express responses to the fundamental solutions in the face of inherent ill-conditioning. See also ADM001763. Presented at the Annual Review of Progress in Applied Computational Electromagnetics (20th) held in Syracuse, NY on 19-23 Apr 2004. Pub. in the Proceedings of the Annual Review of Progress in Applied Computational Electromagnetics (20th), 2004. Prepared in cooperation with USA ERDC Cold Regions Research and Engineering Laboratory, Hanover, NH. Sponsored in part by the U.S. Army Corps of Engineers (CoE) ERDC BT25 and AF25 programs. The original document contains color images.

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