Appendix B: Detailed Technical specifications for the GNSS.

Appendix B: Detailed Technical specifications for the GNSS.

1. 3.6: GBAS and GRAS

   • 3.6.7 NON-AIRCRAFT ELEMENTS
     • 3.6.7.3 MONITORING
       • 3.6.7.3.3 Integrity Monitoring for GNSS Ranging Sources
         • 3.6.7.3 MONITORING
         • For GAST D, the probability of an error, |Er|greater than 1.6 metres on the smoothed corrected pseudorange caused by a ranging source fault, is not detected and reported within 1.5 seconds, , multiplied by the prior probability (P_apriori), shall be less than 1x10-9
         • For GAST D, the probability that an error |Er| on the smoothed corrected pseudorange caused by a ranging source error, is not detected and reported within 1.5 seconds, must fall in the region defined by table B-76 A: P_md_limit Parameters
         • Ranging sources faults for which this requirement applies:
           • Signal deformation
           • Code/Carrier divergence
           • Excessive pseudorange acceleration
           • Erroneous broadcast of ephemeris
       • 3.6.7.3.4 Ionospheric Gradient Mitigation
         • 3.6.7.3 MONITORING
         • The probability of an error |Er|on the smoothed corrected pseudorange, that is (a) caused by iono gradient and (b) is greater than E_IG and (c) not detected and reported within 1.5 seconds, shall be less than 1x10-9
         • The E_IG computed from Type 2 message params shall not exceed 2.75 meters
         • This requirement applies for ionospheric gradients induced errors
       • 3.6.7.3.1 RF monitoring
       • 3.6.7.3.2 Data monitoring
     • 3.6.7.1 PERFORMANCE
     • 3.6.7.2 FUNCTIONAL REQUIREMENTS
     • 3.6.7.4 FUNCTIONAL REQUIREMENTS FOR AUTHENTICATION PROTOCOLS
   • 3.6.1 GENERAL
   • 3.6.2 RF CHARACTERISTICS
   • 3.6.4 DATA CONTENT
   • 3.6.5 DEFINITIONS OF PROTOCOLS FOR DATA APPLICATION
     • 3.6.5.5 PROTECTION LEVELS
       • Protection Levels for all GBAS Approach Service Types: The signal-in-space vertical and lateral protection levels (VPL and LPL) are upper confidence bounds on the error in the position relative to the GBAS reference point.
       • 3.6.5.5.1.1 Normal measurement conditions
       • 3.6.5.5.1.2 Faulted measurement conditions
     • 3.6.5.6 ALERT LIMITS
       • 3.7.1 Annex 10 old. Alert limit. For a given parameter measurement, the error tolerance not to be exceeded without issuing an alert
   • 3.6.6 MESSAGE TABLES
   • 3.6.8 AIRCRAFT ELEMENTS

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