• Home
  • Current congress
  • Public Website
  • My papers
  • root
  • browse
  • IAC-07
  • B2
  • 1
  • paper

    • Contribution to GALILEO Signals

    Paper number

    IAC-07-B2.1.07

    Author

    Mr. Daniel Dassaud, Centre National d'Etudes Spatiales (CNES), France

    Coauthor

    Mr. Jean Luc Issler, Centre National d'Etudes Spatiales (CNES), France

    Coauthor

    Mr. Lionel Ries, Centre National d'Etudes Spatiales (CNES), France

    Coauthor

    Mr. Antoine Richard De Latour, Centre National d'Etudes Spatiales (CNES), France

    Coauthor

    Mr. Laurent Lestarquit, Centre National d'Etudes Spatiales (CNES), France

    Year

    2007

    Abstract
    The GALILEO Signals have  been designed by the members of the "GALILEO Signal Task Force" of the European Commission, which received a delegation for this task from the EC member states. 

The main actors in the GALILEO signal design are, in the frame of the "STF", Germany, France, UK, ESA and EC.  The French space agency CNES,  is the French delegate inside the GALILEO STF, with ministry of transports technical and research directorate DRAST.

The main drivers of a GNSS signal design will be presented first, and the 4 GALILEO bands named E5a, E5b, E6 and E1 will be presented, and compared to the bands of other GNSS systems.

The GALILEO Signal plan is made of 10 signals using 4 frequencies. The GALILEO signal plan has  been designed to ease the joint use of GPS and GALILEO, to provide signals offering the best positioning accuracy, and to provide a very secured and robust navigation service thanks to PRS (Public Regulated Service).

CNES proposed the choice of the two GALILEO frequencies distinct from the L1/E1 and L5/E5a common GPS/GALILEO frequencies. These dedicated frequencies are named E5b and E6, and the complete GALILEO frequency choice tradeoffs will be presented. CNES proposed also  8 GALILEO signal modulations among 10. These modulations are the one of the OS (Open Service), SoL (Safety of Life)  and PRS. 

Proposal of 2 GALILEO signals, named Composite CBOC has been done in full collaboration with UniBwM ( University Bundeswehr Munchen ). The CBOC is the baseline candidate for the OS service at the common GPS/GALILEO frequency called L1/E1. Another proposal is the ALTernate BOC, in the so called E5 band, which is the gathering of E5a and E5b bands. The ALTBOC will allow very accurate and robust navigation for Safety of Life Service, in particular for civil aviation. 

Finally, the COSine-BOC modulation will be presented. This modulation is used for the PRS, and allow better spectral separation between GPS and GALILEO secured signals, and between GALILEO secured and GPS/GALILEO open signals. This modulation is used for two signals, in E1 and E6 bands.

Simple definitions and all the advantages of the CBOC, ALTBOC and COS-BOC modulations will be presented in the paper, which will show why GALILEO signals will offer good performances.
    Abstract document

    IAC-07-B2.1.07.pdf

    Manuscript document

    IAC-07-B2.1.07.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.