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

Volume

62

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

5656

Lastpage

5665

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;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2014.2355295

Filename

6894155