Simultaneous Inversion of UXO Parameters and Background Response
Abstract
Methods for processing data collected at sites with magnetic geology were developed. Instead of relying on filtering data directly to remove the background response, we use instrument position and orientation information to model the sensor response due to soils. Computational routines and techniques to simultaneously invert for the parameters of the buried object and the response of the background have been developed. The response of the magnetic geology is calculated by using an approximate multi-dipole representation of the transmitter. We verified our methods by processing both simulated and field data for the Geonics EM63 time domain electromagnetic sensor and the newly developed Man Portable Vector time domain electromagnetic sensor. Using data acquired over magnetic soil test pits at the Defense Research and Development Canada facility in Suffield, Alberta, we demonstrated an ability to accurate recover dipole parameters using the simultaneous inversion method. Numerical modeling code for solving Maxwell's equations was developed to quantify the effect of the topography on the EMI signal and to determine the validity of the assumption that the response of a target buried in a magnetic and conductive half-space is additive.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2012
- Accession Number
- ADA578973
Entities
People
- Douglas Oldenburg
- Jon Jacobson
- Kevin Kingdon
- Leonard R. Pasion
- Nicolas Lhomme
Organizations
- Sky Research