A Statistical Detector of Multipath for Antenna-array based GNSS Receivers

C. Fernández-Prades, P. Closas, J.A. Fernández-Rubio

Abstract:	This paper proposes a new statistical multipath detector for antenna–array based GNSS receivers. After a brief review of the state–of–the–art in multipath detection, we depict how multipath produces biased estimations in a traditional single– antenna receiver and we extend the Maximum Likelihood synchronization approach to multiples antennas, considering both structured and unstructured arrays. The observation that the spatially colored Gaussian noise assumption captures the statistical behavior of multipath motivates the proposal of a detector based on the structure of the covariance matrix. This test does not require assumptions about the number of signals, their synchronization parameters, or the Directions of Arrival, and can be directly applied in the Intermediate Frequency stage, just after de Analog–to–Digital Converters. In addition, The detector comes almost for free, since the vast majority of beamforming strategies require the computation of the covariance matrix. Computer simulations assess the performance in coherent multipath detection.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2306 - 2315
Cite this article:	Fernández-Prades, C., Closas, P., Fernández-Rubio, J.A., "A Statistical Detector of Multipath for Antenna-array based GNSS Receivers," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2306-2315.
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