u-blox ANTARIS 4 - Page 104

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your position is our focus
4.6.9.2 UBX Valid Flag (Position Fix Indicator)
UBXprotocolprovidesstatusinformationinabundance.Table 35liststhepositionfixflags:
Status Field Message Enumeration Description
GPSfix NAV-STATUS
NAV-SOL
0x00
0x01
NoFix
DeadReckoningonly
0x02
2D-fix
0x03
0x04
3D-fix
GPS+DeadReckoningcombined
17
Flags NAV-STATUS
NAV-SOL
0x01
0x02
GPSfixOK(i.e.withinPDOP&PositionAccuracyMasks)
0x04
0x08
WeekNumbervalid
TimeofWeekvalid
DGPSused
Table 35: UBX Valid Flags (Position Fix Indicator)
Apositionfixshallbetreatedasvalid,if‘GPSfix’reportseithera‘2D-fix’ora‘3D-fix’and‘Flags’indicates‘GPS
fixOK’.
ForDRenabledreceiversapositionfixshallbetreatedasvalidif‘GPSfix’reportseithera‘GPS+DeadReckoning
combined’or‘DeadReckoningonly’and‘Flags’
indicates‘GPSfixOK’.
4.6.9.3 UBX Status Information
InUBXprotocoladditionalstatusandaccuracyinformationisavailableinUBXprotocol:
Status Field Message Enumeration / Unit Description
Pacc NAV-SOL
NAV-POSECEF
cm 3DPositionAccuracyEstimate
SAcc NAV-SOL
NAV-VELECEF
NAV-VELNED
cm/s SpeedAccuracyEstimate
CAcc NAV-VELNED Course/HeadingAccuracyEstimate
Hacc cm HorizontalAccuracyEstimate
Vacc cm VerticalAccuracyEstimate
TAcc NAV-TIMEGPS
NAV-TIMEUTC
ns TimeAccuracyEstimate
PDOP NAV-SOL
NAV-DOP
- PositionDOP 
numSV NAV-SOL - NumberofSVsusedinNavSolution
DiffS NAV-STATUS Bits[1:0]-DGPSInputStatus
• 00:none 
• 01:PR+PRRCorrection
• 10:PR+PRR+CPCorrection
• 11:HighaccuracyPR+PRR+CPCorrection
TTFF NAV-STATUS ms Timetofirstfix(millisecondtimetag)
MSSS NAV-STATUS ms MillisecondssinceStartup/Reset
Valid(Time) NAV-TIMEGPS
NAV-TIMEUTC
0x01
0x02
0x04
ValidTimeofWeek
ValidWeekNumber
ValidUTC(LeapSecondsknown)
Table 36: Status Information in UBX Protocol
ForfurtherinformationabouttheUBXmessages,refertotheANTARIS
®
4 Protocol Specifications [9].


17
RequiresTIM-LRorSBR-LS
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 104