Design and Application of a Wireless Into GNSS Interference Tool (WIGIT)

P.A. Dafesh, P.B. Hess and M. Tadjikov

Abstract:	Adjacent-band compatibility of high power wireless communication systems with Global Positioning System (GPS) and other Global Navigation Satellite System (GNSS) receivers is a growing concern. Interference due to these systems can be as much as 120 dB above a GPS signal near a wireless base station, which may overload a GPS receiver or cause intermodulation products to fall into the GNSS band. There is a need to create spectrum masks that inform regulators how to protect GPS receivers from these high-power wireless systems. However, determining these masks in an anechoic chamber is an exhaustive task, requiring a great deal of calibration, specialized RF filters to reject unintended test equipment noise floors, and manual reconfiguration for many GPS receivers/antennas. To address the issue of testing complexity, we have developed a “Wireless Into GNSS Interference Tool” (WIGIT). The WIGIT uses high-dynamic range digital models of both antennas and interference sources, allowing repeatable wired testing of a wide range of interference conditions, as well as GPS receiver/antenna types without need for specialized RF filters for each frequency of interest. This paper provides a description of the WIGIT hardware and software design, characterization of its performance and its application. In particular, the paper will describe how this tool can be used to aid decision makers in establishing appropriate GNSS spectral masks for anticipated future wireless deployments and in aiding development of receiver test planning scenarios for wireless to GNSS interference assessments.
Published in:	Proceedings of the ION 2015 Pacific PNT Meeting April 20 - 23, 2015 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	507 - 517
Cite this article:	Dafesh, P.A., Hess, P.B., Tadjikov, M., "Design and Application of a Wireless Into GNSS Interference Tool (WIGIT)," Proceedings of the ION 2015 Pacific PNT Meeting, Honolulu, Hawaii, April 2015, pp. 507-517.
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