Localization of low-frequency electromagnetic sources

Yagitani, Satoshi; Ishibana, Kyoko; Nagano, I.; Nishi, Yoshihiko; Yoshimura, Y.; Hayakawa, H.; Tsuruda, K.

doi:10.1002/ecja.20198

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Additionally, even on the ground, such a sensor network could be applied to flexible monitoring of the electromagnetic environment around electrical and electronic equipment. By measuring the electromagnetic field distribution generated around such equipment under actual operating conditions, the field sources can be identified using localization techniques [8]. Such a technique would be expected to be useful in a wide range of electromagnetic compatibility scenarios.…”

Section: Resultsmentioning

confidence: 99%

A Compact Loop Antenna System for Monitoring Local Electromagnetic Environments in Geospace

Yagitani

Ozaki

Kojima

2011

IEICE Trans. Commun.

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SUMMARYA sensor network consisting of a number of palm-sized nodes with small electric and magnetic sensors has been proposed to monitor local electromagnetic activities in space plasmas. In the present study, a compact loop antenna system is designed and fabricated for use in sensor nodes that can capture magnetic vector fields from ELF to MF frequencies. The performance of the developed system is shown to be sufficient to allow measurement of the magnetic field activity around artificial structures in addition to intense natural plasma waves in geospace. key words: loop antenna, sensor network, electromagnetic environment, space plasma

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Section: Resultsmentioning

confidence: 99%

A Compact Loop Antenna System for Monitoring Local Electromagnetic Environments in Geospace

Yagitani

Ozaki

Kojima

2011

IEICE Trans. Commun.

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“…Existing applications employing low frequency magnetic fields for localization may be divided into several main categories: geophysical applications include mineral exploration [21], search for earthquake precursors [34], underground geolocation and cave mapping [35,36]; zoological applications include revealing the hidden lives of underground animals such as badgers [37,38]; motion tracking applications include tracking of pilot helmets, virtual, and augmented reality facilities [39][40][41][42]; medical applications include pill tracing, endoscopy, magnetoencephalography (MEG), and dosage transition monitoring [43][44][45][46]; human rescue applications include localization of trapped miners [47]; navigation applications include indoor and outdoor autonomous robot navigation [48]; localization of noise sources in electrical and electronic equipment [49]; unexploded ordnance (UXO) disposal applications include location of buried objects in a conductive soil [50].…”

Section: Introductionmentioning

confidence: 99%

Remote tracking of a magnetic receiver using low frequency beacons

Sheinker¹,

Ginzburg²,

Salomonski³

et al. 2014

Meas. Sci. Technol.

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Low frequency magnetic fields feature high penetration ability, which allows communication, localization, and tracking in environments where radio or acoustic waves are blocked or distorted by multipath interferences. In the present work, we propose a method for tracking a magnetic receiver using beacons of low frequency magnetic field, where the receiver includes a tri-axial search-coil magnetometer. Measuring the beacons’ magnetic fields and calculating the total-field signals enables localization without restrictions on magnetometer orientation, allowing on-the-move tracking. The total-field signals are used by a global search method, e.g., simulated annealing (SA) algorithm, to localize the receiver. The magnetic field produced by each beacon has a dipole structure and is governed by the beacon’s position and magnetic moment. We have investigated two different methods for estimating beacons’ magnetic moments prior to localization. The first method requires directional measurements, whereas for the second method the total-field signal is used. Effectiveness of these methods has been proved in numerous field tests. In the present work, we introduce a method for tracking a moving receiver by successive localizations. Using previous localization as a starting point of the search method for the next localization can reduce execution time and chances for divergence. The proposed method has been tested using numerous computer simulations. Successful system operation has been verified in field conditions. The good tracking capability together with simple implementation makes the proposed method attractive for real-time, low power field applications, such as mobile robots navigation.

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“…Since noise may be generated continuously from multiple locations, the conventional method of determining the direction of arrival of a single wave is not satisfactory. In one method that has been considered for dealing with this situation, multiple superimposed electromagnetic waves are detected at multiple sites, and the signals present in them are separated by eigenvalue analysis of the signal data, allowing the respective location of source to be identified [1][2][3]. However, these methods are essentially based on the analysis of a single frequency.…”

Section: Introductionmentioning

confidence: 99%

A method of direction finding for dispersive electromagnetic pulses

Tsutsui

Konagaya²,

Kagawa³

2007

Electron. Comm. Jpn. Pt. I

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SUMMARYA new measurement method which can determine the direction of arrival of a pulse electromagnetic wave with frequency dispersion characteristics has been developed. The direction of arrival is determined by conventional data analysis for an electric field component and two magnetic field components. The sensor system is composed of a vertical dipole antenna and two search coils oriented in perpendicular directions in the horizontal plane. The major part of the analysis of the detected signal is composed of the derivation of the spectrum with frequency dispersion from the pulse waveform and the calculation of the direction of arrival from the amplitude and the phase obtained for each frequency in the dispersion characteristics. By the proposed method, the direction of arrival can be determined even when a frequency-dependent delay is produced in propagation (frequency dispersion). The method is applied to lightning discharge pulses, and it is shown that the direction of arrival can be determined with high accuracy. Thus, the method can be used for continuous observation.

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Localization of low-frequency electromagnetic sources

Cited by 7 publications

References 14 publications

A Compact Loop Antenna System for Monitoring Local Electromagnetic Environments in Geospace

A Compact Loop Antenna System for Monitoring Local Electromagnetic Environments in Geospace

Remote tracking of a magnetic receiver using low frequency beacons

A method of direction finding for dispersive electromagnetic pulses

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