Optimised Lock Detection Strategy using BOC Correlator Outputs

Jose Diez, Joao S. Silva, and Antonio Fernandez

Abstract:	Navigation in difficult conditions, such as Urban Canyons or Indoor environments, focuses the interest of the receiver manufactures and application developers for the new generation of GNSS terminals. In this frame, the development of lock detectors that minimise the probability of false and missed loss of lock in the tracking loops and of outage detectors that discriminate a loss of lock from a signal blockage situation critically increase the receiver’s performance in those extreme scenarios. In this paper, an analysis of different lock detectors, taking into account the characteristics of the new Galileo BOC signals, is presented. After reviewing the techniques available in the literature, a new algorithm is proposed to optimise the receiver behaviour in Urban Canyons navigation. The algorithms are based on the correlator outputs, the code and carrier tracking loops signals, the shape of the autocorrelation function, and the estimation of the received signal power. The utilisation of other outputs from specific BOC tracking techniques as the bump jumping will be considered to minimise the receiver complexity.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	782 - 788
Cite this article:	Diez, Jose, Silva, Joao S., Fernandez, Antonio, "Optimised Lock Detection Strategy using BOC Correlator Outputs," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 782-788.
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