EXPERIMENTAL STUDY OF LOCATION AND IDENTIFICATION OF FERROUS SPHEROIDS USING A "SMART" TOTAL FIELD MAGNETOMETER

Authors
  1. McFee, J.E.
  2. Ellingson, R.
  3. Das, Y.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
A microprocessor-controlled magnetometer which accurately locates and identifies compact ferrous objects in real-time is described. The person-portable instrument consists of a car-mounted cesium magnetometer, optical encoder, microcontroller, interface and laptop computer. The instrument guides the operator to collect simultaneous magnetic field and position data in a horizontal plane above an object. Custom algorithms estimate location and dipole moment and use the latter to classify the object. Data collection takes 6 - 13 minutes, location and moment estimation 5 seconds, classification 30 seconds. Experiments using two ferrous spheroids and studies using magnetic total field and vertical component magnetic maps generated by a mathematical computer model are described. Limits of error in estimation of location and dipole moment, error in classification, and relative effects of sources of error are quantified. The rms error for location vector components was 0.0l9 m-0.045 m compared to the average precision of 0.003 m-0.005 m. The average magnitude of the difference between estimated and theoretical dipole moment vectors as a percentage of the theoretical dipole moment was 24.5 plus or minus 11.4% compared to precision of 0.51 - 8.21%. Pattern classification with a computer generated dipole moment design set is described. TRUNCATED
Report Number
DRES-582 —
Date of publication
01 Jan 1993
Number of Pages
101
DSTKIM No
93-01917
CANDIS No
129414
Format(s):
Hardcopy;Originator's fiche received by DSIS

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