Transcript European GNSS Programmes EGNOS and Galileo

L5 only back-up mode
EPO Inputs to IWG#26
05th Feb. 2014
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L5 only backup mode
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In case the L5 only backup mode need would be confirmed it
could be implemented in several ways
• L5 RAIM only mode at user level
• SBAS L5 only NPA mode : only L1-L5 ISC bound has to be
applied by the user. This value can be either broadcast (e.g.
through MT F or defined by default within the MOPS. (Nearly)
neutral in terms of impacts on DFMC ICD.
• SBAS L5 only PA (limited to PA service area): this mode
necessitates to broadcast the following additional information
(impacts on DFMC ICD)
- GIVD and GIVE,
- ISCs and associated bounds,
- (TBC) General alarm message for iono.
Yet, with enhanced DFMC ICD, not enough bandwidth on SBAS L5 for
transmitting these additional data when more than two constellations
are augmented and L1 like time to first start constraint is maintained
 Possibility of relaxing TTFS to 150-200s to be discussed
17 January 2014
MSIL2
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