u-blox ANTARIS 4 User Manual

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your position is our focus
4.6.9 Position Quality
6.9.1 NMEA Valid Flag ator)
positionfixisdeclaredasv oftheconditionsbelowaremet:
Positionfixwithatleast ).Inordertoensureagoodaccu eANTARIS
®
4GPS
Technologydoesnotsup
The‘3DPositionAccurac needstobebelowthe‘PositionAccuracyMask
ThePDOPvalueneedsto ‘PDOPAccuracyMask’.
 te The ‘Position Accuracy  Mask’ are configurable. This  customizing the
behaviorof
theva nrequirements(seeSection 4.6.8)
ds (valid flags) for the different NMEA message for NMEA standard 0183
2.3:
Indicators
4. (Position Fix Indic
A alidifall
• 3satellites(2Dor3Dfix racy,th
port1Dfixes.
• yEstimate’ ’
• bebelowthe

No  Mask’ and th
lidflagtoapplicatio
e ‘PDOP  allows
Table 32 lists of  the status fiel
Version 
NMEA
Message
Field
NoPositionFix
(afterpower-up,
afterlosing
Satellitelock)
ValidPositionFix
butUser
Limitsexceeded
Dead
Reckoning
(linearextra-
polation)
EKF
11
2DPosition

Fix
3D
PositionFix

Combined
GPS/EKF
PositionFix 
0 0 6 6 1/2 1/2 1/2
GGA Status
0=Fixnotavailable/invalid,1=GPSSPSMode,Fixvalid
12
,2=DifferentialGPS,SPSMode,FixValid,
6=Estimated/DeadReckoning
V V V A
13
A A A
Status
A=DataVALID,V=DataInvalid(NavigationReceiverWarning)
N N E E A/D A/D A/D
GLL
ModeIndicator

N=NoFix,A=AutonomousGNSSFix,D=DifferentialGNSSFix,E=Estimated/DeadReckoningFix
1 1 2 2 2 3 3
GSA NavMode
1=FixNotavailable,2=2DFix,3=3DFix
V V V A  A A A
Status
A=DataVALID,V=DataInvalid(NavigationReceiverWarning)
N N E E A/D A/D A/D
RMC
ModeIndicator

N=NoFix,A=AutonomousGNSSFix,D=DifferentialGNSSFix,E=Estimated/DeadReckoningFix
N N E E A/D A/D A/D
VTG odeIndicatorM

N=NoFix,A=AutonomousGNSSFix,D=DifferentialGNSSFix,E=Estimated/DeadReckoningFix
Table 32: NMEA Valid Flag (0183 Version 2.3)

11
TIM-LR/DRenabledreceiversonly
12
 For DR enabled receiver a valid fix is always acombination of a GPS fix with a DR position based on the attached DR sensor (turn rate
sensor,odometer)-
13
ForDRenabledreceiverstheEKFonlyfixisconsideredasvalidaslongasit’swithinthedefinedaccuracyrange.
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 102

u-blox ANTARIS 4 Specifications

General

Brand	u-blox
Model	ANTARIS 4
Category	GPS
Language	English