L76K GPS Module

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L76K GPS Module
L76K GPS Module.jpg

GNSS/UART
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Parameters

Model LC76G(AB) L76K L76B
Compatible
Picture
LC76G p.png
L76K p.png
L76B p.png
GNSS GPS/GLONASS/Galileo/BDS/QZSS GPS/GLONASS/BDS/QZSS GPS/BDS/QZSS
Form Factor LCC LCC LCC
Dimensions 9.7×10.1×2.4 9.7×10.1×2.4 9.7×10.1×2.4
Weight (g) 0.6 0.4 0.5
Normal Operating Temperature -40℃ ~+85℃ -40℃ ~+85℃ -40℃ ~+85℃
Storage Temperature -40℃ ~+90℃ -40℃ ~+90℃ -40℃ ~+90℃
Main Feature
Function Standard Standard Example
Chip AG3352Q AT6558R MT333
L1 Receiver (Channel) 47 tracking ch 32 tracking ch/72 acquisition ch 22 tracking ch/66 acquisition ch
L1 Receiver SBAS Support N/A Support
A-GNSS Support Support Support
Sensitivity (Auto-aquisition) -147dBm -148dBm -148dBm
Sensitivity (re-acquisition) -159dBm -160dBm -160dBm
Sensitivity (tracking) -166dBm -162dBm -163dBm
TTFF (Time To First Fix) Cold Starts 26s, Autonomous
12s, with EASY™
5s,with EPO™
30s, Autonomous
5.5s, With AGNSS
35s, Autonomous
15s, with EASY™
TTFF (Time To First Fix) Warm Starts 20s, Autonomous
2s, with EASY™
/ 30s, Autonomous
5s, with EASY™
TTFF (Time To First Fix) Hot Starts 1s 2s 1s
Position Accuracy 1.5m CEP 2.0m CEP 2.5m CEP
Velocity Accuracy 0.1m/s 0.1m/s 0.1m/s
Acceleration Accuracy (Max) 0.1m/s² 0.1m/s² 0.1m/s²
Timing Accuracy 100ns 30ns 10ns
Update Rate (Max) 10Hz 5Hz 10Hz
Default Baudrate 115200bps 9600bps 9600bps
Geo-fence /
Interference Detection /
Anti-jamming /
LNA
Electrical Parameters
Power Supply 2.55 to 3.6V 2.7V to 3.4V 2.8V to 4.3V
Power Consumption (Acquisition) 36mA(G3B) 29mA (GPS+BDS) 29mA (GPS+BDS)
Power Consumption (Tracking) 36mA(G3B) 29mA (GPS+BDS) 18mA (GPS+BDS)
Power Consumption (RTC backup/low power consumption 13μA 8μA 7μA
Interface
UART
IIC (NMEA) /
Reset
Timing Pulse
Antenna
Short circuit and open circuit detection
Antenna Type Active, Passive Active, Passive Active, Passive
Antenna Power Supply External or Internal External or Internal External or Internal

Interface

Interface Description
VCC Power supply (2.7V~5V)
GND Ground
TX UART data output
RX UART command input
PPS Status indication (output second pulse if the positioning is successful)

NMEA0183

  • The host control output NMEA0183 information from the serial port and analyzes NMEA 0183 sentence to output the information.
  • NMEA 0183 is a standard format developed by the National Marine Electronics Association for marine electronic equipment. It has now become a unified RTCM (Radio Technical Commission for Maritime Services) standard protocol for GPS navigation equipment.
  • NMEA 0183 includes 7 protocol frames including $GPZDA, $GPRMC, $GPVTG, $GPGNS, $GPGGA, $GPGSA, $GPGSV*3, $GPGLL, $GPGST, among which the first two characters followed by $ represent the country or region. For example, GPGGA stands for American GPS, BDGGA stands for China Beidou, GLGGA stands for Russia GLONASS, GAGGA stands for EU Galileo, and GNGGA stands for multi-satellite joint positioning.
  • Take $GPRMC as an example to briefly describe the information represented by each part of the protocol frame. Please refer to the NMEA 0183 manual for the other 6 protocol frames.
Recommended Minimum Specific GPS/TRANSIT Data (RMC) recommended positioning information
$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12> *hh<CR><LF>
$GNRMC,010555.000,A,2232.4682,N,11404.6748,E,0.00,125.29,230822,,,D*71
<1> UTC time, hhmmss.sss (hour, minute, second) format
<2> Positioning state, A=valid positioning, V=invalid positioning
<3> Latitude ddmm.mmmm (degrees and minutes) format (the front 0 will also be transmitted)
<4> Latitude hemisphere N (Northern Hemisphere) or S (Southern Hemisphere)
<5> Longitude dddmm.mmmm (degrees and minutes) format (the preceding 0 will also be transmitted)
<6> Longitude hemisphere E (East longitude) or W (West longitude)
<7> Ground speed (000.0~999.9 knots, the preceding 0 will also be transmitted)
<8> Ground heading (000.0~359.9 degrees, with true north as the reference, the preceding 0 will also be transmitted)
<9> UTC date, ddmmyy (day month year) format
<10> Magnetic declination (000.0~180.0 degrees, the previous 0 will also be transmitted)
<11> Magnetic declination direction, E (East) or W (West)
<12> Mode indication (only NMEA0183 version 3.00 output, A=autonomous positioning, D=difference, E=estimation, N=data invalid)
*hh: The last check code *hh is the data used for parity. In normal use, it is not necessary, but when there is strong electromagnetic interference in the surrounding environment, it is recommended to use. hh represents the bitwise XOR value of all characters of "$" and "*" (excluding these two characters). Individual manufacturers define their own statement format starting with "$P", followed by a 3-character manufacturer ID number, followed by a custom data body.

PCAS Sentence

PCAS sentences are NMEA-specific sentences defined by chip suppliers.

Statement Description Example Function
$PCAS01,<CMD>*<Checksum> configure NMEA serial port baud rate $PCAS01,1*1D set serial port baud rate to 9600

<CMD>The following baud rates are supported:
0 = 4800
1 = 9600
2 = 19200
3 = 38400
4 = 57600
5 = 115200

$PCAS02,<Interval>*<Checksum> set positioning frequency $PCAS02,1000*2E set positioning frequency to 1Hz

<Interval>Positioning interval:
1000: set the positioning frequency to 1 Hz
500: Set the positioning frequency to 2 Hz
200: Set the positioning frequency to 5 Hz

$PCAS03,<nGGA>,<nGLL>,<nGSA>,<nGSV>,<nRMC>,<nVTG>,<nZDA>,<nANT>,<Res>,<Res>,<Res>,<Res >,<Res>,<Res>*<Checksum> Configure NMEA sentence output type and output frequency $PCAS03,1,1,1,1,1,1,1,1,0,0,,, 0,0*02 Enable GGA, GLL, GSA, GSV, RMC, VTG, ZDA, ANT sentence output in NMEA output
(see L76K&L26K GNSS protocol specification: 2.3 PCAS sentence (special sentence))
$PCAS04,<Mode>*<Checksum> Configure Galaxy $PCAS04,3*1A Configure Galaxy as GPS+BeiDou

<Mode>GNSS galaxy configuration:
1 = GPS
2 = BeiDou
3 = GPS + BeiDou (default)
4 = GLONASS
5 = GPS + GLONASS
6 = BeiDou + GLONASS
7 = GPS + BeiDou + GLONASS
(QZSS is enabled by default and does not support configuration.)

$PCAS10,<Flag>*<Checksum> Restart module $PCAS10,0*1C Hot start

<Flag>Restart mode:
0 = warm start
1 = warm start
2 = cold start
3 = Cold boot and factory reset

Note: After changing the configuration content, you need to modify the checksum <Checksum> accordingly. For more details, you can refer to Quectel_L76KL26K_GNSS.