L76K GPS Module
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Parameters
Model | LC76G(AB) | L76K | L76B |
---|---|---|---|
Compatible | |||
Picture | |||
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: |
$PCAS02,<Interval>*<Checksum> | set positioning frequency | $PCAS02,1000*2E | set positioning frequency to 1Hz <Interval>Positioning interval: |
$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: |
$PCAS10,<Flag>*<Checksum> | Restart module | $PCAS10,0*1C | Hot start <Flag>Restart mode: |
Note: After changing the configuration content, you need to modify the checksum <Checksum> accordingly. For more details, you can refer to Quectel_L76KL26K_GNSS.