Implementation and Optimization of a Galileo E1 Two-Step Tracking Algorithm using Data/Pilot Combining and Extended Integration Time

Aleksandar Jovanovic, Cecile Mongredien, Youssef Tawk, Cyril Botteron, Pierre-Andre Farine, Guenter Rohmer

Abstract:	This paper brings additional light on the previously proposed two-step tracking algorithm for E1 CBOC tracking. More specifically, assessment of the different DLL and PLL tracking loop architectures are analyzed, taking into consideration coherent and non-coherent data and pilot channel combining schemes and increasing integration time beyond data bit period, which is 4 ms for E1 CBOC signal. Our assessment is based on implementing the different tracking loop architectures in a software receiver fed with RF samples generated with a full constellation Galileo E1 simulator. The results are obtained for integration times equal and above the data bit period (i.e, from 4 to 20 ms) and for high to low C/No (i.e., from 41 down to 26 dB-Hz). Also, the influence of the secondary code removal on the tracking loops is shown using a specially conceived algorithm to acquire it. Robustness of the tracking loops is tested under low C/N0, in order to investigate the channel combining strategies. Four different combining cases are tested. Finally, performance analyses are presented and the results are discussed.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	3756 - 3766
Cite this article:	Jovanovic, Aleksandar, Mongredien, Cecile, Tawk, Youssef, Botteron, Cyril, Farine, Pierre-Andre, Rohmer, Guenter, "Implementation and Optimization of a Galileo E1 Two-Step Tracking Algorithm using Data/Pilot Combining and Extended Integration Time," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 3756-3766.
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