Final Technical Report for ELF/VLF Electromagnetic Detection and Characterization of Deeply Buried Targets
Abstract
In the light of the current and ongoing needs of DoD and other agencies for detection of subsurface structures and monitoring of activities within those structures there is a crucial need for tools that allow one to evaluate the myriad of proposed VLF/ELF sensor systems. The overall objective of this effort is to develop analytical tools to model and assess proposed ELF/VLF sensor systems for detection of underground structures. The approach taken is to: (a) model the primary electric and magnetic fields generated by local (e.g. current loops or electric dipoles), remote (e.g. HAARF/HIPAS), and natural sources (e.g. external noise); (b) model the perturbed fields due to the specified underground structures; (c) combine the primary and perturbed fields along with the external noise for an effective field at the sensor; (d) model the sensor (the GEM-2 from Geophex, Ltd.) given the manufacturer's specifications and then using these results; and (e) evaluate the response of the sensor system to the specified underground structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 22, 1998
- Accession Number
- ADA349208