SkyTraq PX1172R Manual de usuario
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PX1172R
Features
Centimeter‐levelaccuracyRTKreceiver
Multi‐Band,Quad‐GNSS
17mmx22mmsize
NMEA‐0183andRTCM3.xprotocol
Easytointegrate
Operatingtemperature‐40~+85ºC
RoHScompliant
Applications
Machinecontrol&automation
Unmannedaerialvehicle
Precisionagriculture
GISdatacollection
Precisionheading&attitude
Compact‐SizeMulti‐BandGNSS
ReceiverforCentimeter‐Level
AccuracyApplications
The PX1172R offers centimeter‐level accuracy based on carrier
phase RTK technique and can be used for a wide range of
high‐accuracypositioningapplications.Its17mmx22mmstamp
size makes it ideal for mobile precision positioning application
requiringcompactformfactor.
ThereceiverreceivesRTCM3.xdatafromalocalbasestation,a
virtualreferencestation(VRS)inaNetworkRTKconfiguration,
oranotherSkyTraqRTKreceiversetupasinbasestationmode
toperformcarrierphaseRTKprocessing,achievingcentimeter
levelaccuraterelativepositioning.
The PX1172R receiver is based on SkyTraq’s high‐performance
Phoenix GNSS chipset, featuring fast signal acquisition search
engineandhigh‐sensitivitytrackengine.Searchengineperforms
16 million time‐frequency hypothesis testing per second,
offeringindustry‐leadingsignalacquisitionperformance.
Thereceiverisoptimizedformassmarketapplicationsrequiring
high‐precisioncentimeter‐levelaccuracy,high‐performance,low
power,andlowercost.
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TECHNICALSPECIFICATIONS
ReceiverType 230channelPhoenixGNSSengine
GPS/QZSSL1/L2C,BeiDouB1I/B2I,GalileoE1/E5b,GLONASSL1OF/L2OF
AccuracyPosition1.5mCEPautonomousmode
1cm+1ppmRTKmode
Velocity0.05m/sec*
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Time12ns
MovingBaseHeading0.13degree*
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TimetoFirstFix 1secondhot‐startunderopensky(average)
28secondwarm‐startunderopensky(average)
29secondcold‐startunderopensky(average)
RTKConvergence <10sec
Reacquisition 1s
MaxUpdateRate
GPS/GLO/GAL/BDS GPS/GLO/GAL GPS/GLO GPS/GAL GPS/BDS GPS
RTK 10Hz 10Hz 20Hz 20Hz 20Hz 25Hz
RAW 25Hz
MB/AMBRTK 8Hz
RTK:forprecisepositioning.Moving‐Base(MB)RTKforpreciseheading.AdvancedMovingBase
(AMB)RTKforprecisepositioning&heading.
OperationalLimits Altitude<80,000mandvelocity<515m/s
SerialInterface 3.3VLVTTLlevel
ProtocolNMEA‐0183V4.1
GGA,GLL,GSA,GSV,RMC,VTG
115200baud,8,N,1
RTCM3.xorSkyTraqrawdatabinary
115200baud,8,N,1
DatumDefaultWGS‐84anduserdefinableinstand‐alonemode
DependsonbasereferenceframewheninRTKmode
InputVoltage 3.3VDC+/‐10%
CurrentConsumption 100mA
Dimension17mmLx22mmWx2.9mmH
Weight:1.7g
OperatingTemperature ‐40oC~+85oC
StorageTemperature ‐55oC~+100oC
Humidity5%~95%non‐condensing
*150%@30m/sfordynamicoperation
*2(1‐sigma)headingaccuracyusing1meterbaseline
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FUNCTIONALDESCRIPTION
ActiveantennaisrequiredtousewithPX1172R.Thereceivedsignalgoesthroughasignalsplitter,
toindividualL1andL2/L5SAWfilterstoremoveout‐bandinterference,thentothePX100GNSS
receiverchipforRTKsignalprocessing.UsingcorrectiondatafromanRTKbasestation,therover
PX1172Rcomputesitspositiontocentimeter‐levelaccuracyrelativetothebasestation.
SUPPORTEDRTCMMESSAGES
Whenoperatinginrovermode,PX1172RcandecodefollowingRTCM3.3messages:
RTCMMessageType Description
1004 ExtendedL1/L2GPSRTKobservables
1005 StationaryRTKreferencestationantennareferencepoint
1006 StationaryRTKreferencestationARPwithantennaheight
1012 ExtendedL1/L2GLONASSRTKobservables
1033 Receiverandantennadescription
1074 GPSMSM4
1075 GPSMSM5
1076 GPSMSM6
1077 GPSMSM7
1084 GLONASSMSM4
1085 GLONASSMSM5
1086 GLONASSMSM6
1087 GLONASSMSM7
1094 GalileoMSM4
1095 GalileoMSM5
1096 GalileoMSM6
1097 GalileoMSM7
1114 QZSSMSM4
1115 QZSSMSM5
1116 QZSSMSM6
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1117 QZSSMSM7
1124 BeiDouMSM4
1125 BeiDouMSM5
1126 BeiDouMSM6
1127 BeiDouMSM7
1230 GLONASSCode‐PhaseBiases
Whenoperatinginbasemode,PX1172RcanoutputfollowingRTCM3.3messages:
RTCMMessageType Description
1005 StationaryRTKreferencestationantennareferencepoint
1074 GPSMSM4
1077 GPSMSM7
1084 GLONASSMSM4
1087 GLONASSMSM7
1094 GalileoMSM4
1097 GalileoMSM7
1114 QZSSMSM4
1117 QZSSMSM7
1124 BeiDouMSM4
1127 BeiDouMSM7
1230 GLONASSCode‐PhaseBiases
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PINOUT
PINOUTDESCRIPTION
PinNo. Name Description
1
GND
Ground
2
RF_IN
RFinput
3
GND
Ground
4,5,6
NC
Noconnection,emptypin
7
VCC_RF
VoltageforexternalLNA
8,9,10,11
NC
Noconnection,emptypin
12
GND
Ground
13
NC
Noconnection,emptypin
14
GND
Ground
15,16,17,18,19
NC
Noconnection,emptypin
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20
RTK_STAT
Status signal
0:RTKFix
Blink :RTKFloat
1:otherwise
21,22,23,24,25
NC
Noconnection,emptypin
26
RXD2
UARTserialdatainput,3.3VLVTTL.
OnesimplexasynchronousserialUARTportisimplemented.ThisUARTinputis
normallyforsendingRTCM‐SC104correctiondataorbasestationSkyTraqraw
measurementdatatothereceiver at115200baudrate.In the idlecondition,
thispinshouldbedrivenHIGH.Ifthedrivingcircuitryispoweredindependently
ofPX1172R,ensurethatthispinisnotdriventoHIGHwhenPX1172Risputto
sleep,ora10K‐ohmseriesresistorcanbeaddedtominimizeleakagecurrent.
27
TXD2
UARTserialdataoutput,3.3VLVTTL.
Notused.
28,29,30,31
NC
Noconnection,emptypin
32
GND
Ground
33,34
VDD33
Powersupply,3.3VDC
35
NC
Noconnection,emptypin
36
V_BCKP
Backupsupplyvoltage forinternal RTC andbackupSRAM, 1.3V ~ 3.6V. VBAT
must be applied whenever VCC is applied. This pin should be powered
continuously to minimize the startup time. If VCC and V_BCKP are both
removed,thereceiverwillbeinfactorydefaultmodeuponpowerup,alluser
configurationsetislost.Forapplicationsthedoesnotcarecoldstartingevery
time,thispincanbeconnecttoVCC.
37
GND
Ground
38,39,40
NC
Noconnection,emptypin
41
GND
Ground
42
TXD
UARTserialdataoutput,3.3VLVTTL.
One full‐duplex asynchronous serial UART port is implemented. This UART
output is normally used for sending position, time and velocityinformation
fromthereceiverinNMEA‐0183format.Whenidle,thispinoutputHIGH.
43
RXD
UARTserialdatainput,3.3VLVTTL.
Onefull‐duplexasynchronousserialUARTportisimplemented.ThisUARTinput
is normally for sending commands or information to the receiver in SkyTraq
binary protocol. In the idle condition, this pin should be driven HIGH. If the
drivingcircuitryis powered independently of PX1172R,ensurethat this pin is
notdriventoHIGHwhenPX1172Risputtosleep,ora10K‐ohmseriesresistor
canbeaddedtominimizeleakagecurrent.
RTCM‐SC104correctiondataorbasestationSkyTraqrawmeasurement data
canalsobesenttothisUARTinput.
44
SDA
Notused,leaveunconnected
45
SCL
Notused,leaveunconnected
46,47
NC
Noconnection,emptypin
48
GND
Ground
49
RSTN
Externalactive‐lowresetinputtothebaseband.
Onlyneededwhenpowersupplyrisetimeisverysloworsoftwarecontrolled
resetisdesired.
50
BOOT_SEL
Noconnectionfornormaluse.Pull‐lowforloadingfirmwareintoemptyor
corruptedFlashmemoryfromROMmode.
51
TRIG
Externalinterrupttriggerinput
52
NC
Noconnection,emptypin
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53
1PPS
One‐pulse‐per‐second (1PPS) time mark output, 3.3V LV‐TTL. The rising edge
synchronizedtoUTCsecondwhengetting3Dpositionfix.Thepulsedurationis
about100msecatrateof1Hz.
54
NC
Noconnection,emptypin
TheRTCMcorrectiondatacanbeinputfromeitherpin‐43RXDorpin‐26RXD2,butnotboth.
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MECHANICALDIMENSION
Symbol Dimension(mm)
A 17.00
B 22.00
C 3.85
D 1.05
E 1.90
F 1.10
G 0.80
H 1.50
K 3.65
L 3.25
M 2.10
N 1.10
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ELECTRICALSPECIFICATIONS
ABSOLUTEMAXIMUMRATINGS
Parameter Minimum Maximum Condition
SupplyVoltage(VCC) ‐0.5 3.6 Volt
BackupBatteryVoltage(V_BCKP) ‐0.5 3.6 Volt
InputPinVoltage ‐0.5 VCC+0.5 Volt
InputPoweratRF_IN +5 dBm
StorageTemperature ‐55 +100 degC
OPERATINGCONDITIONS
Parameter Min Typ Max Unit
SupplyVoltage(VDD33) 3 3.3 3.6 Volt
AcquisitionCurrent(excludeactiveantennacurrent) 100 mA
TrackingCurrent(excludeactiveantennacurrent) 100 mA
BackupVoltage(V_BCKP) 1.3 3.6 Volt
BackupCurrent(VDD33voltageapplied) 54 uA
BackupCurrent(VDD33voltageoff) 13 uA
OutputLowVoltage 0.4 Volt
OutputHIGHVoltage 2.4 Volt
InputLOWVoltage 0.8 Volt
InputHIGHVoltage 2 Volt
InputLOWCurrent ‐10 10 uA
InputHIGHCurrent ‐10 10 uA
RFInputImpedance(RF_IN) 50 Ohm
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APPLICATIONCIRCUIT
ForPrecisePositioning,RoverModeConfiguration1
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