Theory and Practice of Near-Field Electromagnetic Ranging

H.G. Schantz

Abstract:	This paper illustrates the divergence of phase, signal, and energy velocities in the near field by employing space-time diagrams of the evolution of near-fields. In addition this paper describes near-field link and impedance relations a near-field phase diagram for electrically small quadrature transmitters. Near-field physics enables near-field electromagnetic ranging systems in a variety of modes for a diverse range of applications. This paper summarizes recent results applying near-field electromagnetic ranging to a Signal-of-Opportunity Location Device (SOLD) implementation. Q-Track tested this system in realistic environments including a multi-story building and underground. SOLD yielded an rms accuracy of 26cm when returning to a calibration point and 46cm rms between calibration points.
Published in:	Proceedings of the 2012 International Technical Meeting of The Institute of Navigation January 30 - 1, 2012 Marriott Newport Beach Hotel & Spa Newport Beach, CA
Pages:	978 - 1013
Cite this article:	Schantz, H.G., "Theory and Practice of Near-Field Electromagnetic Ranging," Proceedings of the 2012 International Technical Meeting of The Institute of Navigation, Newport Beach, CA, January 2012, pp. 978-1013.
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