Precision sensing of AC magnetic fields from moving platforms

Mark W. Roberson; Abigail E. Bell; Steve Waller; Laura E. Roberson; Grant D. Robertson; Russell G. Robertson

doi:10.1117/12.2519247

13 May 2019 Precision sensing of AC magnetic fields from moving platforms

Mark W. Roberson, Abigail E. Bell, Steve Waller, Laura E. Roberson, Grant D. Robertson, Russell G. Robertson

Proceedings Volume 10992, Geospatial Informatics IX; 109920I (2019) https://doi.org/10.1117/12.2519247
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

Mapping alternating current (AC) magnetic field strengths over time by mapping of the field strengths presents detailed information of human activities and the presence of facilities. Unlike few fixed location viewing, with a moving detector measurement accuracy becomes more challenging. The use of real-time geospatial analytics requires several changes in detection methodologies and data dissemination. For small unmanned airborne systems (sUAS), ensuring the rotational stability of the sensor while reducing the self-sensing noise presents design challenges in the airframe. For ground vehicles, the rapidly changing values of the AC magnetic fields require rapid and accurate updates of the position. This information must be precisely indexed to magnetic field strength frequency and phase information. We discuss our work with the collection of multi-axis magnetic field data from both multi-rotor sUAS and ground vehicles. We model the power lines using detailed measurements of the conductors and field modeling software. We study the sUAS magnetic field data as a function of height above the ground plane of the experimental sites for both the fundamental and harmonic frequencies and phases relative to a fixed location reference time signal. The collection regions include rural, interstate, and suburban areas with both overhead and buried power lines contributing to the signals.

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Mark W. Roberson, Abigail E. Bell, Steve Waller, Laura E. Roberson, Grant D. Robertson, and Russell G. Robertson "Precision sensing of AC magnetic fields from moving platforms", Proc. SPIE 10992, Geospatial Informatics IX, 109920I (13 May 2019); https://doi.org/10.1117/12.2519247

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KEYWORDS

Magnetism

Sensors

Magnetic sensors

Roads

Geographic information systems

Global Positioning System

Analytics

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