report of the action team on global navigation satellite systems (gnss)
report of the action team on global navigation satellite systems (gnss)
report of the action team on global navigation satellite systems (gnss)
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C<strong>on</strong>diti<strong>on</strong>s and C<strong>on</strong>straints58. Defined for positi<strong>on</strong> soluti<strong>on</strong> meeting <str<strong>on</strong>g>the</str<strong>on</strong>g> representative user c<strong>on</strong>diti<strong>on</strong>s and operatingwithin <str<strong>on</strong>g>the</str<strong>on</strong>g> service volume over any 24-hour interval. Based <strong>on</strong> using <strong>on</strong>ly <strong>satellite</strong>s transmittingstandard code and indicating “healthy” in <str<strong>on</strong>g>the</str<strong>on</strong>g> broadcast navigati<strong>on</strong> message (sub-frame 1).59. In support <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> service availability standard, 24 operati<strong>on</strong>al <strong>satellite</strong>s must be available<strong>on</strong> orbit with 0.95 probability (averaged over any day). At least 21 <strong>satellite</strong>s in <str<strong>on</strong>g>the</str<strong>on</strong>g> 24 nominalplane/slot positi<strong>on</strong>s must be set healthy and transmitting a navigati<strong>on</strong> signal with 0.98 probability(yearly averaged).60. SPS Service Availability Standard c<strong>on</strong>diti<strong>on</strong>s and c<strong>on</strong>straints:> 99% Horiz<strong>on</strong>tal Service Availability average locati<strong>on</strong>.> 99% Vertical Service Availability average locati<strong>on</strong>.> 90% Horiz<strong>on</strong>tal Service Availability worst case locati<strong>on</strong>.> 90% Vertical Service Availability worst case locati<strong>on</strong>.61. The United States Government commits to providing SPS service reliability inaccordance with <str<strong>on</strong>g>the</str<strong>on</strong>g> following tolerances:Service Reliability Standard C<strong>on</strong>diti<strong>on</strong>s and C<strong>on</strong>straints:>= 99.94% <strong>global</strong> average 30-meter Not-to-Exceed (NTE) SPS SIS URE.• Standard based <strong>on</strong> a measurement interval <str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>on</strong>e year; average <str<strong>on</strong>g>of</str<strong>on</strong>g> daily values within <str<strong>on</strong>g>the</str<strong>on</strong>g>service volume.• Standard based <strong>on</strong> 3 service failures per year, lasting no more than 6 hours.>99.79% worst case single point average, 30-meters Not-to-Exceed (NTE) SPS SIS URE.• Standard based <strong>on</strong> a measurement interval <str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>on</strong>e year; average <str<strong>on</strong>g>of</str<strong>on</strong>g> daily values from <str<strong>on</strong>g>the</str<strong>on</strong>g>worst case point within <str<strong>on</strong>g>the</str<strong>on</strong>g> service volume.• Standard based <strong>on</strong> 3 service failures per year lasting no more than 6 hours each.Standard Global Average Positi<strong>on</strong>ing Domain Accuracy:> 13 meters 95% All-in-View Horiz<strong>on</strong>tal Error (SIS Only).> 22 meters 95% All-in-View Vertical Error!(SIS Only) Worst Site Positi<strong>on</strong>ing Domain:• Defined for positi<strong>on</strong> soluti<strong>on</strong> meeting <str<strong>on</strong>g>the</str<strong>on</strong>g> representative user c<strong>on</strong>diti<strong>on</strong>s.• Standard based <strong>on</strong> a measurement interval <str<strong>on</strong>g>of</str<strong>on</strong>g> 24 hours for any point within <str<strong>on</strong>g>the</str<strong>on</strong>g> servicevolume defined for time transfer soluti<strong>on</strong> meeting <str<strong>on</strong>g>the</str<strong>on</strong>g> Accuracy = 36 meters 95% All-in-View Horiz<strong>on</strong>tal Error (SIS Only).>77 meters 95% All-in-View Vertical Error (SIS Only) Time Transfer Accuracy.>40 nanosec<strong>on</strong>ds time transfer error 95% <str<strong>on</strong>g>of</str<strong>on</strong>g> time (SIS Only) representative user c<strong>on</strong>diti<strong>on</strong>sStandard based <strong>on</strong> a measurement interval <str<strong>on</strong>g>of</str<strong>on</strong>g> 24 hours averaged over all points within <str<strong>on</strong>g>the</str<strong>on</strong>g>service volume.16