Title :
A Null-Field Method for Estimating Underground Position
Author :
Davis, Clayton P. ; Chew, Weng Cho ; Tucker, W.W. ; Atkins, P.R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL
Abstract :
The geometric characteristics of low-frequency magnetic dipole fields and their relative insensitivity to the host media have made low-frequency coils useful for underground geolocation. A robust and succinct method is presented for converting dipole field measurements into estimates of receiver position. A noisy half-space model of the Earth is used to model the receiving environment. A perfectly conducting sphere immersed in a homogeneous conducting background is used to study the localized effects of buried metals.
Keywords :
geomagnetism; loop antennas; position measurement; terrestrial electricity; buried metals effect; cave radio signals; dipole field measurements; geometric characteristics; low-frequency coils; magnetic dipole fields; noisy half-space model; null-field method; receiver position estimation; underground position estimation; Antenna measurements; Coils; Electromagnetic measurements; Frequency; Low-frequency noise; Magnetic field measurement; Position measurement; Robustness; Transmitters; Working environment noise; Half-space; loop antennas; magnetic dipoles;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.2008.2000878
