Civil Aviation GALILEO E5 receivers architecture

Abstract : The Galileo E5 signal is of particular interest to the civil aviation community. Indeed, it will be broadcast in an Aeronautical Radio Navigation Services (ARNS). Moreover, combined with the Galileo E1 signal, Galileo E5 will allow dual-frequency ionosheric-free pseudoranges combinations supporting a dramatic increase of accuracy. In addition, one of its components, E5b, will carry the Galileo integrity message needed by the user to benefit from the Safety-of-Life service (SoL). Civil aviation users have specific requirements in terms of performance of future Galileo receivers. Those requirements are provided by EUROCAE in the interim Minimum Operational Performance Specification (MOPS) document as developed by the Working Group 62. One important minimum requirement is for the receiver to process independently Galileo E5a and E5b signals mainly in order to reduce interference impact and to benefit from the Safety-of-Life (SoL) service. There are different possible signal processing techniques to build a civil aviation receiver achieving the performance requirements which are stated in terms of accuracy and robustness to interference, for instance. This paper presents an overview of the different signal processing techniques expected to be implemented in future Galileo E5 receivers to meet civil aviation requirements. Most of the presented techniques were considered by EUROCAE WG62 to derive requirements. Some new techniques which could provide increased performance, at the cost of an increased complexity in general, are presented as well. The levels of performance achieved by all those techniques are indicated. In the first section of this paper, the Galileo E5 signal, as described in the Galileo SIS ICD, is shortly presented. Then, the architecture of the receiver is described along with the main functions involved and their respective performance for Galileo E5 signal. These functions are: RF/IF filtering, the blanker system (temporal and frequency-based: FDAF), the acquisition process (temporal and frequency-based), tracking process and interference detection techniques.
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Communication dans un congrès
CNES-ESA, 1st Workshop on GALILEO Signals and Signal Processing, Oct 2006, Toulouse, France. 2006
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Frédéric Bastide, Benoit Roturier, Olivier Julien, Christophe Macabiau, Emilie Rebeyrol, et al.. Civil Aviation GALILEO E5 receivers architecture. CNES-ESA, 1st Workshop on GALILEO Signals and Signal Processing, Oct 2006, Toulouse, France. 2006. 〈hal-01021797〉

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