Improved detection performance using a Bayesian decision-theoretic approach

L Collins*, D Keiswetter, L Carin, IJ Won

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The fundamental goal of target identification using geophysical methods is to achieve a high detection rate along with a low false alarm rate. While many electromagnetic (EM) and magnetic detectors achieve the first of these goals, it is often at the cost of a prohibitively high false alarm rate. In this paper, we present a Bayesian decision-theoretic approach to target identification using EM data. This approach provides both an improved detection scheme and performance evaluation in the form of ROC curves plotting probability of detection versus false alarm rate. In addition to detailing the Bayesian-based approach, we present selected case studies that utilize broadband electromagnetic data acquired with the GEM-3 sensor. We compare the survey results obtained with standard thresholding analyses to survey results obtained using statistically based signal detection theory. Our preliminary results indicate that the detector derived using signal detection theory is superior to the standard detection schemes that utilize contour plots and thresholding. The results also indicate that detection performance is dramatically improved when multi-frequency data is utilized. Furthermore, since detection performance is observed to be a function of frequency, careful selection of the EM frequencies at which data is recorded may result in further improvements.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE SYMPOSIUM ON THE APPLICATION OF GEOPHYSICS TO ENVIRONMENTAL AND ENGINEERING PROBLEMS
EditorsRS Bell, MH Powers, T Larson
PublisherENVIRONMENTAL & ENGINEERING GEOPHYSICAL SOCIETY
Pages239-247
Number of pages9
ISBN (Print)*************
StatePublished - 1998
Externally publishedYes
EventSymposium on the Application of Geophysics to Environmental and Engineering Problems at the Annual Meeting of the Environmental-and-Engineering-Geophysical-Society - CHICAGO, Israel
Duration: Mar 22 1998Mar 26 1998

Conference

ConferenceSymposium on the Application of Geophysics to Environmental and Engineering Problems at the Annual Meeting of the Environmental-and-Engineering-Geophysical-Society
CountryIsrael
CityCHICAGO
Period03/22/9803/26/98

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