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Non-linear inversion of controlled source multi-receiver electromagnetic induction data for unexploded ordnance using a continuation method
Authors:A Benavides  ME Everett  
Institution:aDepartment of Geology and Geophysics, Texas A&M University, College Station, Texas, TX 77843, USA
Abstract:This work adopts a continuation approach, based on path tracking in model space, to solve the non-linear least-squares problem for discrimination of unexploded ordnance (UXO) using multi-receiver electromagnetic induction (EMI) data. The forward model corresponds to a stretched-exponential decay of eddy currents induced in a magnetic spheroid. We formulate an over-determined, or under-parameterized, inverse problem. An example using synthetic multi-receiver EMI responses illustrates the efficiency of the method. The fast inversion of actual field multi-receiver EMI responses of inert, buried ordnances is also shown. Software based on the continuation method could be installed within a multi-receiver EMI sensor and used for near-real-time UXO decision-making purposes without the need for a highly-trained operator.
Keywords:Near-surface geophysics  Electromagnetic induction  Data processing  Inversion  Homotopy  Unexploded ordnance
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