DocumentCode :
1311645
Title :
Multipath Estimation in Multicorrelator GNSS Receivers using the Maximum Likelihood Principle
Author :
Blanco-Delgado, Nuria ; Nunes, Fernando D.
Author_Institution :
Inst. de Telecomun., Portugal
Volume :
48
Issue :
4
fYear :
2012
fDate :
10/1/2012 12:00:00 AM
Firstpage :
3222
Lastpage :
3233
Abstract :
This paper proposes a multipath mitigation technique for multicorrelator Global Navigation Satellite System (GNSS) receivers that estimates the line-of-sight (LOS) and the multipath signal parameters in a computationally efficient manner. The maximum likelihood (ML) principle is applied leading to a nonlinear optimization problem. A closed-form solution of the nonlinear estimation problem is proposed where the estimation of the LOS delay is performed using a grid search approach. Lack of convergence, initialization, and computational complexity problems are avoided and a small computational burden is achieved. A low-complexity complementary method based on interpolation is proposed in order to increase the resolution of the estimated delay with respect to the limit set by the correlators´ spacing. Theoretical performance and limits are determined considering that the delay is estimated through a grid search approach and the observations are obtained in the presence of nonwhite Gaussian noise due to the correlation between samples.
Keywords :
computational complexity; correlation methods; interpolation; maximum likelihood estimation; nonlinear estimation; optimisation; satellite navigation; LOS delay; closed-form solution; computational complexity problems; grid search approach; interpolation; line-of-sight; low-complexity complementary method; maximum likelihood principle; multicorrelator GNSS receivers; multicorrelator global navigation satellite system receivers; multipath estimation; multipath mitigation technique; multipath signal parameters; nonlinear estimation problem; nonlinear optimization problem; nonwhite Gaussian noise; Correlators; Delay; Interpolation; Maximum likelihood estimation; Receivers; Vectors;
fLanguage :
English
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9251
Type :
jour
DOI :
10.1109/TAES.2012.6324696
Filename :
6324696
Link To Document :
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