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Additional Analysis of the ESTCP Discrimination Study Data at Camp Sibert, Alabama. Project 200504: Practical Discrimination Strategies for Application to Live Sites

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Technical rept., version 2, Jan-Oct 2008

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Geonics EM61 cart, MTADS EM61 and EM-63 cart data from Camp Sibert were investigated to determine of the number of cant analyze anomalies could be reduced and more objective stop-digging criteria selected. Many of the cant analyze anomalies in the MTADS EM61 were caused by cart-bounce along North-South transects and could be avoided by using only East-West transect data. However, poor data coverage increased the chances of generating false negative declarations. If North-South transects are retained, sensor motion relative to the ground can cause difficulties in obtaining good model fits to the data. A modeling framework developed elsewhere was used to determine if an anomaly was caused by sensor motion or a compact metallic target. The method has promise but had limited applicability due to the lack of accurate ground-clearance and topographic data. To determine an objective operating point, the training data must be representative of the test-data. In particular, outliers need to be avoided and here this was achieved by using multiple feature vectors, obtained by analysis of a depth versus misfit curve, in the classification. Using this technique a false-negative in the EM-63 data could be avoided.

Subject Categories:

  • Cybernetics
  • Magnetic and Electric Field Detection and Detectors
  • Miscellaneous Detection and Detectors
  • Ammunition and Explosives

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