u-blox ANTARIS 4 - Page 106


your position is our focus
ThefollowingSBASmessagesaresupported,inaccordancetostandardDO-229C:
MessageType MessageContent Usedfrom
0(0/2) TestMode All
1 PRNMaskAssignment Primary
2,3,4,5 FastCorrections Primary
6 Integrity Primary
7 FastCorrectionDegradation Primary
9 GEONavigation(Ephemeris) All
10 Degradation Primary
12 TimeOffset Primary
17 GEOAlmanachs All
18 IonosphereGridPointAssignment Primary
24 MixedFast/LongtermCorrections Primary
25 LongtermCorrections Primary
26 IonosphereDelays Primary
Table 37: Supported SBAS messages
 – a class
Beta-1equipment.Alltimeoutsetc.arechosenfortheEnRouteCase.Donotusethisequipmentfor
temisstill
intestmode
 time
en
doesnotca theGEOsfromallbuttheEGNOSsystemshouldbe
disallowed,using thePRNMask.Itisimportantto understandthatwhile EGNOSis intestmode,anythingcan
to
 Note
eSBAScorrectiondata.
Note This ANTARIS
®
4 SBAS implementation is – in accordance with standard RTCA/DO-229C
safetyoflifeapplications!
AseachGEOservicesaspecificregion,thecorrectionsignalisonlyusefulwithinthatregion.
Therefore,mission
planningiscrucialtodeterminethebestpossibleconfiguration.Thedifferentstages(Testmodevs.Operational)
ofthevariousSBASsystemsfurthercomplicatethistask.Thefollowingexamplesshowpossiblescenarios:
Example 1: SBAS Receiver in North America
Atthetimeofwriting,theWAASsystemisinoperationalstage,whereastheEGNOSsys
(ESTB).Therefore,andespeciallyintheeasternpartsoftheUS,caremustbe takeninordernottohaveEGNOS
satellitestakingpreferenceoverWAASsatellites.ThiscanbeachievedbyDisallowingTestModeuse(thisinhibits
EGNOSsatellitesfrombeingusedasacorrectiondata
source),butkeepingthePRNMasktohaveallSBASGEOs
enabled(whichallowsEGNOSGEOstobeusedfornavigation).
Example 2: SBAS Receiver in Europe
At the  of writing, the EGNOS system is still in test mode. To try out EGNOS operation, Testmode usage
mustbe abled.SincetheWAASGEO#122can
bereceivedinthewesternpartsofEurope,butsincethisGEO
rrycorrectiondatafortheEuropeancontinent,
happen
theEGNOSsignals,suchassuddeninterruptionofserviceorbroadcastofinvalidorinconsistentdata.
TheANTARIS
®
4 GPSreceivermakesalwaysuseofthebestavailabl
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 106