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Features
⚫
Decimeter level accuracy RTK DR receiver
⚫
3-axis accelerometer & gyroscope
⚫
Automatic sensor calibration
⚫
230 Channel receiver
⚫
GPS/GLONASS/Galileo/Beidou/QZSS receiver
⚫
17mm x 22mm size
⚫
NMEA-0183 and RTCM 3.x protocol
⚫
Easy to integrate
⚫
Operating temperature -40 ~ +85ºC
⚫
RoHS compliant
Applications
⚫
4 Wheel Vehicle RTK Navigation
PX1172RD-20
RTK Dead Reckoning Receiver for
Decimeter Level Accuracy Application
The PX1172RD-20 GNSS RTK Dead-Reckoning receiver
module combines RTK position data, gyroscope data
(measuring
turning
(measuring distance traveled) to formulate position
solution. This enables accurate navigation solution in
poor signal environment or signal blocked area. The
PX1172RD-20 is ideal for 4-wheel vehicle applications
requiring accurate continuous navigation.
PX1172RD-20
can
Reckoning (ADR) mode if the vehicle wheel-tick
odometer
signal
Odometer-less Dead Reckoning (ODR) mode if the
odometer signal is not connected.
The Extended Kalman Filter algorithm combines GNSS
and sensor data with weighting function dependent on
GNSS signal quality. In poor signal reception area, the
position error is reduced by dead reckoning.
The PX1172RD-20 with dead-reckoning feature, position
is output as soon as power is applied to the module
without the need of getting GPS/GNSS position fix.
The receiver is suitable for RTK applications that require
high performance continuous positioning and velocity
data.
1
angle),
and
odometer
operate
in
Automotive
is
connected;
or
operate
data
Dead
in
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Related Manuals for SkyTraq PX1172RD-20
Summary of Contents for SkyTraq PX1172RD-20
- Page 1 Automatic sensor calibration solution. This enables accurate navigation solution in poor signal environment or signal blocked area. The ⚫ 230 Channel receiver PX1172RD-20 is ideal for 4-wheel vehicle applications ⚫ GPS/GLONASS/Galileo/Beidou/QZSS receiver requiring accurate continuous navigation. ⚫ 17mm x 22mm size...
- Page 2 Protocol NMEA-0183 V4.1 GGA, GLL, GSA, GSV, RMC, VTG 115200 baud, 8, N, 1 RTCM 3.x or SkyTraq raw data binary 115200 baud, 8, N, 1 Datum Default WGS-84 and user definable in stand-alone mode Depends on base reference frame when in RTK mode Input Voltage 3.3V +/- 10%...
- Page 3 BLOCK DIAGRAM Module block schematic Active antenna is required to use with PX1172RD-20. The received signal goes through a signal splitter, to individual L1 and L2/L5 SAW filters to remove out-band interference, then to the PX100-2R-01A GNSS receiver chip for RTK signal processing. Using correction data from an RTK base station, the PX1172RD-20 computes the antenna position to decimeter-level accuracy relative to the base station.
- Page 4 SUPPORTED RTCM MESSAGES When operating in rover mode, PX1172RD-20 can decode following RTCM 3.3 messages: RTCM Message Type Description 1004 Extended L1/L2 GPS RTK observables 1005 Stationary RTK reference station antenna reference point 1006 Stationary RTK reference station ARP with antenna height...
- Page 5 PINOUT PINOUT DESCRIPTION Pin No. Name Description Ground RF input RF_IN RTK Position: RF_IN antenna position Ground No connection, empty pin 4,5,6 Voltage for external LNA VCC_RF No connection, empty pin 8,9,10,11 Ground No connection, empty pin Ground No connection, empty pin UART serial data input, 3.3V LVTTL.
- Page 6 HIGH. If the driving circuitry is powered independently of PX1172RD-20, ensure that this pin is not driven to HIGH when PX1172RD-20 is put to sleep, or a 10K-ohm series resistor can be added to minimize leakage current.
- Page 7 No connection, empty pin 46,47 Ground External active-low reset input to the baseband. RSTN Only needed when power supply rise time is very slow or software controlled reset is desired. No connection for normal use. Pull-low for loading firmware into empty or BOOT_SEL corrupted Flash memory from ROM mode.
- Page 8 MECHANICAL DIMENSION Symbol Dimension (mm) 17.00 22.00 3.85 1.05 1.90 1.10 0.80 1.50 3.65 3.25 2.10 1.10...
- Page 9 ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Minimum Maximum Condition Supply Voltage (VCC) -0.5 Volt Backup Battery Voltage (V_BCKP) -0.5 Volt Input Pin Voltage -0.5 VCC+0.5 Volt Input Power at RF_IN Storage Temperature +100 degC OPERATING CONDITIONS Parameter Unit Supply Voltage (VDD33) Volt Acquisition Current (exclude active antenna current) Tracking Current (exclude active antenna current)
- Page 10 APPLICATION CIRCUIT...
- Page 11 ODOMETER and DIRECTION pins. When changing between ADR and ODR mode of operation, cold start command should be issued, or the V_BCKP power should be removed such that internal DR state will be cleared and PX1172RD-20 will re-do DR calibration. CALIBRATION of DR PX1172RD-20 performs calibration of gyro bias and odometer scale automatically using GNSS.
- Page 12 RTK performance. POWER SUPPLY REQUIREMENT PX1172RD-20 requires a stable power supply, avoid ripple on VCC pin (<50mVpp). Power supply noise can affect the receiver’s sensitivity. Bypass capacitors should be placed close to the module VCC pin, with values adjusted depending on the amount and type of noise present on the supply line.
- Page 13 HANDLING GUIDELINE The PX1172RD-20 modules are rated MSL4, must be used for SMT reflow mounting within 72 hours after taken out from the vacuumed ESD-protective moisture barrier bag in factory condition < 30degC / 60% RH. If this floor life time is exceeded, or if the received ESD-protective moisture barrier bag is not in vacuumed state, then the device need to be pre-baked before SMT reflow process.
- Page 14 RTK Usage Guideline Below conditions are required for getting RTK fix solution. If the conditions are not met, PX1172RD-20 will only have float or DGPS/3D solution and behave like a normal GNSS receiver. * Base and rover distance under 30Km...
- Page 15 “*” Checksum delimiter. Checksum field. <CR><LF> 0D0A Ending of sentence. (carriage return, line feed) Table 2: Overview of SkyTraq receiver’s NMEA messages $GPGGA Time, position, and fix related data of the GPS receiver. $GNGLL Position, time and fix status. $GNGSA Used to represent the ID’s of satellites which are used for position fix.
- Page 16 The formats of the supported NMEA messages are described as follows: GGA – Global Positioning System Fix Data Time, position and fix related data for a GPS receiver. Structure: $GPGGA,hhmmss.sss,ddmm.mmmmm,a,dddmm.mmmmm,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF> 5 6 7 8 9 11 12 13 Example: $GPGGA,065020.000,2448.8865412,N,12057.9900345,E,4,24,0.6,15.358,M,19.400,M,2.000,0000*4F<CR><LF> Field Name Example...
- Page 17 GLL – Latitude/Longitude Latitude and longitude of current position, time, and status. Structure: $GNGLL,ddmm.mmmmm,a,dddmm.mmmmm,a,hhmmss.sss,A,a*hh<CR><LF> 6 7 8 Example: $GNGLL,2448.8865412,N,12057.9900345,E,065020.000,A,D*4E<CR><LF> Field Name Example Description Latitude 2448.8865412 Latitude in ddmm.mmmmmmm format Leading zeros transmitted N/S Indicator Latitude hemisphere indicator ‘N’ = North ‘S’...
- Page 18 GSA – GNSS DOP and Active Satellites GNSS receiver operating mode, satellites used in the navigation solution reported by the GGA or GNS sentence and DOP values. Structure: $GNGSA,A,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x,x*hh<CR><LF> 1 2 3 3 3 3 3 3 3 3 3 3 3 3 4 5 6 7 8 Example: $GNGSA,A,3,05,06,09,11,12,17,19,194,195,196,199,,1.4,0.6,1.2,1*38<CR><LF>...
- Page 19 Table 3: GNSS Identification Table for GSA, GSV System System ID (Talker) Signal ID Signal Name 1 (GP) All signals L1 C/A L1 P(Y) L2 P(Y) L2C-M L2C-L L5-I L5-Q GLONASS 2 (GL) All signals G1 C/A G2 C/A GLONASS (M) G2P GALILEO 3 (GA) All signals...
- Page 20 GSV – GNSS Satellites in View Number of satellites (SV) in view, satellite ID numbers, elevation, azimuth, and SNR value. Four satellites maximum per transmission. Structure: $GPGSV,x,x,xx,xx,xx,xxx,xx,…,xx,xx,xxx,xx,x *hh<CR><LF> 1 2 3 4 5 6 7 4 5 6 7 8 9 Example: $GPGSV,4,1,13,196,73,094,46,195,70,070,46,199,60,166,42,19,54,134,46,1*54<CR><LF>...
- Page 21 RMC – Recommended Minimum Specific GNSS Data Time, date, position, course and speed data provided by a GNSS navigation receiver. Structure: $GNRMC,hhmmss.sss,A,dddmm.mmmmm,a,dddmm.mmmmm,a,x.x,x.x,ddmmyy,,,a,a*hh<CR><LF> 6 7 8 10 11 12 Example: $GNRMC,065020.000,A,2448.8865412,N,12057.9900345,E,000.5,137.8,060623,,,R,V*1C<CR><LF> Field Name Example Description UTC time 065020.000 UTC time in hhmmss.sss format (000000.00 ~ 235959.999) Status Status ‘V’...
- Page 22 VTG – Course Over Ground and Ground Speed The actual course and speed relative to the ground. Structure: GNVTG,x.x,T,,M,x.x,N,x.x,K,a*hh<CR><LF> Example: $GNVTG,137.8,T,,M,000.5,N,001.0,K,D*1F<CR><LF> Field Name Example Description Course 137.8 True course over ground in degrees (000.0 ~ 359.9) Speed 000.5 Speed over ground in knots (000.0 ~ 999.9) Speed 001.0 Speed over ground in kilometers per hour (000.0 ~ 1800.0)
- Page 23 STI,20 Dead Reckoning Status message Structure: PSTI,xx,x,x,x,xx,x,x,x,xxx.xx,xx.xx,xx.xx,x.xx*xx<CR><LF> 1 2 3 4 5 6 7 8 11 12 13 Example: $PSTI,20,1,1,1,5,A,0,0,-58.48,20.14,0.01,1.01*73<CR><LF> Field Example Format Unit Description numeric Proprietary message identifier: 20 numeric DR Calibration Status 1: calibrated 0: not calibrated numeric Gyro Calibrate Status 1: calibrated 0: not calibrated...
- Page 24 ORDERING INFORMATION Model Name Description PX1172RD-20 GNSS RTK Dead Reckoning receiver module...
- Page 25 Revision History Revision Date Description November 1, 2023 Initial release The information provided is believed to be accurate and reliable. These materials are provided to customers and may be used for informational purposes only. No responsibility is assumed for errors or omissions in these materials, or for its use. Changes to specification can occur at any time without notice.
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