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Título:
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ML estimator and hybrid beamformer for multipath and interference mitigation in GNSS receivers
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Autor/a:
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Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio; Fernández Prades, Carlos
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
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Abstract:
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This paper addresses the estimation of the code-phase(pseudorange) and the carrier-phase of the direct signal received from a direct-sequence spread-spectrum satellite transmitter. The
signal is received by an antenna array in a scenario with interference
and multipath propagation. These two effects are generally
the limiting error sources in most high-precision positioning applications.
A new estimator of the code- and carrier-phases is derived
by using a simplified signal model and the maximum likelihood
(ML) principle. The simplified model consists essentially of
gathering all signals, except for the direct one, in a component with
unknown spatial correlation. The estimator exploits the knowledge
of the direction-of-arrival of the direct signal and is much simpler
than other estimators derived under more detailed signal models.
Moreover, we present an iterative algorithm, that is adequate for a
practical implementation and explores an interesting link between
the ML estimator and a hybrid beamformer. The mean squared
error and bias of the new estimator are computed for a number
of scenarios and compared with those of other methods. The presented
estimator and the hybrid beamforming outperform the existing
techniques of comparable complexity and attains, in many
situations, the Cramér–Rao lower bound of the problem at hand. |
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Abstract:
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Peer Reviewed |
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Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal
-Artificial satellites in telecommunication
-Signal processing
-Antenna arrays
-Electromagnetic compatibility
-Antenna arrays
-Computational complexity
-Direction-of-arrival estimation
-Interference migration
-Interference suppression
-Iterative methods
-Maximum likelihood principle
-Phase estimation
-Radio receivers
-Radiofrequency interference
-Satellite navigation
-Spread spectrum communication
-ML estimator
-Hybrid beamformer
-Interference mitigation
-GNSS receiver
-Code-phase estimation
-Carrier-phase estimation
-Direct-sequence spread-spectrum satellite transmitter
-Multipath propagation
-Iterative algorithm
-Mean squared error method
-Adaptive signal estimation
-Array signal processing
-Calibration
-Code division multiaccess
-Delay estimation
-Early-late estimator
-Global Positioning System
-Interference suppression
-Multipath channel
-Pseudorandom code
-Radio navigation
-Radio receiver
-Satellite navigation system
-Gaussian channel
-Channel coding
-Satèl·lits artificials -- Comunicacions
-Processament del senyal
-Antenes -- Agrupacions
-Compatibilitat electromagnètica |
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Derechos:
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Tipo de documento:
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Artículo |
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Editor:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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Compartir:
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