Title :
Horizontal and Vertical Electric Dipoles in a Two-Layer Conducting Medium
Author :
Fares, Salma A. ; Fleming, Robert ; Dinn, Don ; Purcell, Christopher J.
Author_Institution :
Pantel Int. Inc., Dartmouth, NS, Canada
Abstract :
Measurements of low-frequency magnetic fields produced by horizontal and vertical electric current dipoles in shallow seawater are compared to Weaver model estimates. A periodic chirp covering the band 20 to 500 Hz was transmitted to enable coherent detection. Transmission losses were measured over ranges exceeding 700 m between the source antennas and an underwater tri-axial magnetometer. The magnetic field amplitudes are in good agreement with the Weaver model.
Keywords :
electric current; electromagnetic wave propagation; magnetic fields; magnetometers; underwater acoustic communication; Weaver model estimates; bandwidth 20 Hz to 500 Hz; coherent detection; horizontal electric current dipoles; low-frequency magnetic fields; magnetic field amplitudes; periodic chirp; shallow seawater; transmission losses; two-layer conducting medium; underwater tri-axial magnetometer; vertical electric current dipoles; Antenna measurements; Chirp; Dipole antennas; Magnetic field measurement; Magnetic fields; Magnetometers; Marine vehicles; Channel characterization; correlation; dipole; magnetic noise; magneto-inductive; magnetometer; noise cancelling; noise measurement; underwater communication; weaver model;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2014.2355295
