Multipath Mitigation Using an Electromagnetic Fence for Ground Reference Stations

Yujie Zhang and Chris Bartone

Abstract:	This paper investigates a multipath mitigation technique with the implementation of an electromagnetic fence for applications of GPS ground reference stations. This technique may provide an effective tool to mitigate the ground bounce and reflection (e.g. due to airport facilities and buildings) effect. The fences are installed at a ground facility and sited in terms of distance from the receiving GPS antenna and the spacing between the fences so as to mitigate ground multipath at different elevation angles; a limited number of fences were used to investigate the ground bounce at a specific azimuth angle. The result indicates an improvement in tracing reliability in terms of tracking time for low elevation satellites. The carrier-to-noise ratio and the ionosphere free code minus carrier data are comparable with and without the fences installed. The data indicates that low elevation satellite signal availability is increased. Finally, additional data collection is warranted to further assess the usefulness of these electromagnetic fences for particular ground reference station applications.
Published in:	Proceedings of the 60th Annual Meeting of The Institute of Navigation (2004) June 7 - 9, 2004 Dayton Marriott Hotel Dayton, OH
Pages:	271 - 280
Cite this article:	Zhang, Yujie, Bartone, Chris, "Multipath Mitigation Using an Electromagnetic Fence for Ground Reference Stations," Proceedings of the 60th Annual Meeting of The Institute of Navigation (2004), Dayton, OH, June 2004, pp. 271-280.
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