Accession Number : ADA513102


Title :   Discrimination Using the Geonics EM63 in a Cued Interrogation Mode at Fort McClellan, AL


Descriptive Note : Final rept. Mar 2008-Mar 2009


Corporate Author : SKY RESEARCH INC VANCOUVER (CANADA)


Personal Author(s) : Billings, Stephen


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA513102


Report Date : MAR 2009


Pagination or Media Count : 126


Abstract : Data were collected at the former Fort McClellan to test the Geonics EM63 deployed in a cued interrogation mode. Except for one 37mm and several 60mm seed items, all munitions encountered were 75mm or 3.8 inch shrapnel rounds. The EM63 surveys were cued off production mode EM61 data. Polarization tensor models were fit to each surveyed anomaly. Ground truth information was used to train a statistical classifier. For small and medium items, an early time decay rate, equivalent to one that could be obtained with an EM61, provided almost as much discrimination potential as the late time decay rate. The slow rate of data acquisition and the decay curve analysis as good or better than inversion for a physics based model suggest the benefit of the extra information extracted from the EM63 is not justified by the greater costs since some level of discrimination can be obtained without complex inversion and statistical classification, using simpler instrumentation. Better instrumentation and rigorous inversion and statistical classification would still be expected to provide a richer variety of feature vectors to significantly improve discrimination.


Descriptors :   *SURFACE TRUTH , *ELECTROMAGNETIC INDUCTION , *INTERROGATION , *DISCRIMINATION , *SURVEYS , *UNEXPLODED AMMUNITION , PHYSICS , AMMUNITION , CLASSIFICATION , DATA ACQUISITION , INVERSION , TENSORS , STATISTICAL ANALYSIS , DECAY , COSTS , TIME , RATES , GRAPHS , MODELS , ANOMALIES , POLARIZATION


Subject Categories : LOGISTICS, MILITARY FACILITIES AND SUPPLIES
      MISCELLANEOUS DETECTION AND DETECTORS
      AMMUNITION AND EXPLOSIVES
      ELECTRICITY AND MAGNETISM
      SOLID WASTES POLLUTION AND CONTROL
      ELECTRICAL AND ELECTRONIC EQUIPMENT


Distribution Statement : APPROVED FOR PUBLIC RELEASE