Improving Multipath Mitigation in GPS/Galileo BOC Signals with Gating Functions

Fernando D. Nunes, Fernando M. G. Sousa, Jose M.N. Leitao

Abstract:	A new multipath mitigation technique is proposed for binary offset carrier (BOC) signals using the concept of gating function originally conceived for GPS C/A. Instead of correlating the incoming signal with early and late versions of the locally-generated BOC signal, as in the conventional narrow correlator receiver, we use specially-tailored pulses that diminish the number of potential false-lock points of the code discriminator and enhance the robustness to multipath. The multipath mitigation capability of the proposed receiver is analyzed and compared with the narrow correlator and the double-delta (HRC) solutions. Results obtained with BOC(n,n) and BOC(2n,n) signals (both types foreseen for the modernized GPS and the European GNSS, Galileo) show that this method efficiently eliminates the ranging errors due to multipath in the medium and longdelay regions, thus comparing favorably with the conventional receiver correlation techniques.
Published in:	Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005) June 27 - 29, 2005 Royal Sonesta Hotel Cambridge, MA
Pages:	498 - 507
Cite this article:	Nunes, Fernando D., Sousa, Fernando M. G., Leitao, Jose M.N., "Improving Multipath Mitigation in GPS/Galileo BOC Signals with Gating Functions," Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005), Cambridge, MA, June 2005, pp. 498-507.
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