Abstract
We report progress toward achievement of a new magnetic tensor gradiometer technology that is being developed with support from the Strategic Environmental Research and Development Program (SERDP). The objective of this R & D effort is to provide a man-portable magnetic tensor gradiometer for real-time, point-by-point detection, localization and classification (DLC) of Unexploded Ordnance (UXO). The portable gradiometer processes data from triaxial fluxgate magnetometers to develop sets of rotationally invariant, gradient-contraction-type scalar parameters. The scalar parameters provide the basis for a unique Scalar Triangulation and Ranging (STAR) method that determines the UXO's position and magnetic signature. In particular, our paper presents: a) A review of the magnetic STAR concept, b) Details of construction and operation of the portable STAR-type gradiometer, c) Results of computer simulations of the effects of fluxgate noise on the gradiometer's target-tracking performance and d) Results of experimental measurements of uncorrelated fluxgate noise and correlated gradient channel imbalance errors, e) Preliminary results from a gradient imbalance noise compensation algorithm. The R & D results indicate that the magnetic STAR concept potentially will provide an exceptionally valuable, motion-noise-resistant magnetic sensing technology for real-time, DLC of Unexploded Ordnance, and buried mines.
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