Sychronization of Pulsed Pseudolite Signals: Analysis and Comparison

Daniele Borio, Eduardo Cano and Gianmarco Baldini

Abstract:	Pseudolites are an emerging technology with the potential to extend the range of application of Global Navigation Satellite Systems (GNSS). However, interference with existing GNSS and near-far problems can significantly reduce the effectiveness of this technology. For this reason, several signal design techniques have been used to mitigate the aforementioned issues. The use of a pulsing scheme is a promising approach for reducing pseudolite interference and consists of transmitting pseudolite signals only during dedicated time slots. However, the use of pulsing schemes requires dedicated synchronization algorithms. A pseudolite receiver needs to determine the position of the received pulse within the pulsing sequence, in addition to the code delay and Doppler frequency of the received signal. In this paper, two algorithms for pseudolite pulse detection and synchronization are analyzed and compared. The techniques considered are characterized analytically and through Monte Carlo simulations. Moreover, they are integrated within a software pseudolite receiver and tested using live pseudolite signals. A pseudolite adopting a modified version of the Radio Technical Commission for Maritime Services (RTCM) 104 pulsing scheme has been implemented on a Universal Software Radio Platform (USRP) II and used for conducting several experiments for different operating conditions. Experimental results support the theoretical findings and the effectiveness of the pulse synchronization algorithms considered.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	482 - 493
Cite this article:	Borio, Daniele, Cano, Eduardo, Baldini, Gianmarco, "Sychronization of Pulsed Pseudolite Signals: Analysis and Comparison," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 482-493.
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