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Gating Functions for Multipath Mitigation in GNSS BOC Signals

Nunes, F. ; Sousa, F. ; Leitão, J.

IEEE Trans. on Aerospace and Electronic Systems Vol. 43, Nº 3, pp. 951 - 964, July, 2007.

ISSN (print): 0018-9251
ISSN (online): 0018-9251

Journal Impact Factor: 1,024 (in 2008)

Digital Object Identifier:

Abstract
A new multipath mitigation technique is proposed for binary offset carrier (BOC) signals in global navigation satellite systems (GNSS) using the concept of gating function originally conceived for the GPS coarse-acquisition (C/A) code. Specially-tailored pulses are utilized to diminish the number of false-lock points of the code discriminator response and to improve the multipath mitigation capability. The code loop includes only four real correlators (two extra correlators are required for the simplified bump-jumping algorithm with BOC(n,n) signals). Results obtained with BOC(n,n) and BOC(2n,n) signals show that this technique eliminates the multipath ranging errors for reflected rays with relative delays typically above twenty percent of the spreading code chip duration, thus comparing favorably with the conventional receiver correlation techniques.