GPS Antenna Mask Ring (GAMR)

G. Graham, J.W. Smith

Abstract:	The Global Positioning System (GPS) Antenna Mask Ring (GAMR) is a novel passive GPS anti-jam device, based on choke ring antenna technology. Choke ring antenna technology is normally used to decrease the impact of multipath on GPS survey systems. GAMR employs this technology to create an artificial horizon, 10 to 15 degrees above the local horizon. This artificial horizon tends to reduce the effectiveness of ground based and most airborne jammers. This technology allows the use of conventional GPS antennas, providing for a significant cost savings compared to other GPS anti-jam antenna. Tests indicate that 15-20dB improvements against jamming are achievable. This reduces the effective jamming range of a one-watt tactical jammer from 20 to 2km.
Published in:	Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003) June 23 - 25, 2003 Hyatt Regency Hotel Albuquerque, NM
Pages:	333 - 336
Cite this article:	Graham, G., Smith, J.W., "GPS Antenna Mask Ring (GAMR)," Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003), Albuquerque, NM, June 2003, pp. 333-336.
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