Table of Contents
International Journal of Navigation and Observation
Volume 2012 (2012), Article ID 804732, 11 pages
http://dx.doi.org/10.1155/2012/804732
Research Article

A New Multipath Mitigation Method for GNSS Receivers Based on an Antenna Array

1CNES—The French Space Agency, Navigation/Localization Signal & Equipment Department, 18 Avenue Edouard Belin, 31401 Toulouse Cedex 9, France
2ONERA—The French Aerospace Lab ONERA, DEMR Department, 2 Avenue Edouard Belin, 31000 Toulouse, France
3Thales Alenia Space, BS Navigation & Integrated Communication, 26 Avenue Jean-Fran├žois Champollion, 31037 Toulouse, France
4Institut Supérieur de L’Aéronautique et de l’Espace ISAE, DEOS Department, 10 Avenue Edouard Belin, 31055 Toulouse Cedex 4, France

Received 4 November 2011; Revised 29 February 2012; Accepted 21 March 2012

Academic Editor: Pau Closas

Copyright © 2012 Sébastien Rougerie et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The well-known Space-Alternating Generalized Expectation Maximisation (SAGE) algorithm has been recently considered for multipath mitigation in Global Navigation Satellite System (GNSS) receivers. However, the implementation of SAGE in a GNSS receiver is a challenging issue due to the numerous number or parameters to be estimated and the important size of the data to be processed. A new implementation of the SAGE algorithm is proposed in this paper in order to reach the same efficiency with a reduced complexity. This paper focuses on the trade-off between complexity and performance thanks to the Cramer Rao bound derivation. Moreover, this paper shows how the proposed algorithm can be integrated with a classical GNSS tracking loop. This solution is thus a very promising approach for multipath mitigation.