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Sensors 2017, 17(8), 1734; doi:10.3390/s17081734

A Novel Detection Method for Underwater Moving Targets by Measuring Their ELF Emissions with Inductive Sensors

1
The Key Laboratory of Ocean Acoustics and Sensing, Ministry of Industry and Information Technology, School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China; libin cme@nwpu.edu.cn (B.L.)
2
The Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China
*
Author to whom correspondence should be addressed.
Received: 21 June 2017 / Revised: 23 July 2017 / Accepted: 25 July 2017 / Published: 28 July 2017
(This article belongs to the Special Issue Marine Sensing)
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Abstract

In this article, we propose a novel detection method for underwater moving targets by detecting their extremely low frequency (ELF) emissions with inductive sensors. The ELF field source of the targets is modeled by a horizontal electric dipole at distances more than several times of the targets’ length. The formulas for the fields produced in air are derived with a three-layer model (air, seawater and seafloor) and are evaluated with a complementary numerical integration technique. A proof of concept measurement is presented. The ELF emissions from a surface ship were detected by inductive electronic and magnetic sensors as the ship was leaving a harbor. ELF signals are of substantial strength and have typical characteristic of harmonic line spectrum, and the fundamental frequency has a direct relationship with the ship’s speed. Due to the high sensitivity and low noise level of our sensors, it is capable of resolving weak ELF signals at long distance. In our experiment, a detection distance of 1300 m from the surface ship above the sea surface was realized, which shows that this method would be an appealing complement to the usual acoustic detection and magnetic anomaly detection capability. View Full-Text
Keywords: underwater targets; ELF emissions; horizontal electric dipole; three-layer media; inductive sensors underwater targets; ELF emissions; horizontal electric dipole; three-layer media; inductive sensors
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Wang, J.; Li, B.; Chen, L.; Li, L. A Novel Detection Method for Underwater Moving Targets by Measuring Their ELF Emissions with Inductive Sensors. Sensors 2017, 17, 1734.

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