NDLI: Maximum likelihood propagation-delay estimation in unknown correlated noise using antenna arrays: application to Global Navigation Satellite Systems

Content Provider	IEEE Xplore Digital Library
Author	Seco Granados, G. Fernandez Rubio, J.A.
Copyright Year	1998
Description	Author affiliation: Signal Theory & Commun. Dept., Univ. Politecnica de Catalunya, Barcelona, Spain (Seco Granados, G.)
Abstract	The problem of estimating the propagation-delay of a desired signal in the presence of interferences and multipath propagation is addressed. This paper presents the maximum likelihood (ML) propagation-delay estimator for a signal arriving at a sensor array. The novel characteristic is that the desired signal impinges on the array with a known steering vector. This fact allows to assume an unknown and arbitrary spatially colored noise. The Cramer-Rao bound (CRB) for the problem is derived and numerically compared with the variance of the MLE. The MLE is applied to the Global Navigation Satellite Systems, in order to reduce the serious performance deterioration that the interferences ad the multipath propagation produce. We show that in presence of coherent reflections of the desired signal the presented estimator is no longer the MLE and becomes biased. However, its bias is much lower than that of other conventional estimators.
Starting Page	2065
Ending Page	2068
File Size	404405
Page Count	4
File Format	PDF
ISBN	0780344286
ISSN	15206149
DOI	10.1109/ICASSP.1998.681550
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-05-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Maximum likelihood estimation Antennas and propagation Antenna arrays Interference Global Positioning System Propagation delay Satellite navigation systems Sensor arrays Spread spectrum radar Communication systems
Content Type	Text
Resource Type	Article

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