u-blox ANTARIS 4 - Timing

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4.7 Timing
4.7.1 TIMEPULSE
ANTARIS
®
4 GPS receivers provide a hardware-synchronized TIMEPULSE (Pin 29) with a Time Pulse Period of
1ms to 60s. The polarity (rising or falling edge) and the pulse duration can be configured. Use the UBX
proprietary message UBX-CFG(Config)-TP(TimePulse) to change the TIMEPULSE settings. The
UBX-TIM(Time)-TP(Timepulse) message provides the time information for the next TIMEPULSE, time source
andaquantizationerror.
Parameter Description
Pulse Mode
‘fallingedge’
‘disabled’
TIMEPULSEsynchronizationonthefallingedge
TIMEPULSEdisabled(outputsignallow)
‘risingedge’
TIMEPULSEsynchronizationontherisingedge
Pulse Period eTIMPeriodofth EPULSE
Pulse Length theDurationof TIMEPULSE
Pulse Frequency
Thepulsefrequencyiscalculatedfromthepulseperiod(u-centeroutputonly)
Time Source
SelectionwhethertheTimePulseisGPStimeorUTCtimesynchronized
Cable Delay
the
iver
Signaldelayin cablefromtheantennatotheANTARIS
4GPSRece
®
User Delay
Thecabledelayfrom
ignaldelayof
anyuserapplication
ANTARIS
®
4GPSReceivertotheuserdevicepluss
RF Group Delay
DelayofthesignalintheANTARIS
®
4GPSReceiverRFmodule(hardcoded)
Table 40: TIMEPULSE Parameter description
Pulse Mode: Rising
TIMEPULSE
TIMEPULSE
Pulse Mode: Falling
timetop of second top of second
Pulse Period
Pulse Length
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Figure 85: Example of a 1PPS Signal designed with TIMEPULSE
AsapulsereferenceGPSorUTC timecanbeselected.ThismakesadifferenceifthePulsePeriodexceeds1s.As
theTIMEPULSEissynchronizedwithGPS-orUTC-timethePulsePeriodmustfulfillthefollowingcondition:
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 n must be an integer value!
 Note TheMaximumPulseLengthcan’texceedthePulsePeriodminus1ms.
sdPulsePerion 60=⋅
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 109