Characterisation of the Pseduorange Error Due to Code Doppler Shift in Galileo E5 and L1 Receivers Using the GRANADA Bit-True Simulator

José Diez, Antonio Fernández, João S. Silva, Livio Marradi and Vincent Gabaglio

Abstract:	Although the impact of code phase offset due to Doppler shift in the pseudorange measurements is usually neglected compared to other error sources, in GNSS professional receivers operating in high-dynamic environments this error can reduce significantly the precision of the position estimation. In this paper, a detailed analysis of the influence of the code Doppler shift in Galileo E5 and L1 receivers using the GRANADA bit-true software receiver simulator is provided. This software has been developed by Deimos- Space under Alenia Spazio specification in the frame of the GAlileo Receiver Development Activities (GARDA) of the Galileo Joint Undertaking (GJU) under the 6th Framework Program of the European Commission [1]. The aim of the study is to assess the environmental conditions that require a carrier aided technique to avoid a degradation of the system performance due to this effect. After introducing GRANADA, the simulator architecture is described; including the insertion of code Doppler shift in the transmitted signal. This operation is based on applying a variable delay to the generated baseband signal using interpolation techniques. Then, the impact of this code phase offset in the receiver autocorrelation function is analysed. Finally, the results of the simulations performed on Galileo E5 and L1 signals are presented, providing recommendations to mitigate this effect for different environment conditions.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	1656 - 1661
Cite this article:	Diez, José, Fernández, Antonio, Silva, João S., Marradi, Livio, Gabaglio, Vincent, "Characterisation of the Pseduorange Error Due to Code Doppler Shift in Galileo E5 and L1 Receivers Using the GRANADA Bit-True Simulator," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 1656-1661.
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