This paper presents a novel method for locating magnetic interference sources on unmanned aircraft systems (UAS) destined for aeromagnetic surveys. The technique is demonstrated in an indoor laboratory, whereas most magnetic mapping has previously been done outdoors, and is performed on four different types of UAS with their motors engaged. Sources are discussed on each UAS platform but can also be used as a point of reference for typical components that cause interference.

Commercial solutions for an automated DI-flux are practically reduced to the AutoDIF and the GyroDIF. We analyze the pros and cons of both in terms of suitability at the Livingston Island geomagnetic observatory, Antarctica. We conclude that the GyroDIF is more suitable for harsh conditions due to its simpler infrastructure. We also show the instrument housing design and its control electronics. Our experiences can benefit the geomagnetic community, which often faces similar challenges.

In this paper, we summarize the difficulties that Sfe detection presents and explain a line of work we initiated to overcome these difficulties with the goal of achieving a system capable of performing automatic detection. Some properties of Sfe, including spherical symmetry around the vortex and different time durations between Sfe and other natural variations, were used to construct an index allowing us to detect Sfe.