Category:GPS

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PC Debug tool

GPS data receiver from computer

Output Data

  • GGA: time, location, positioning type
  • GLL: UTC time, longitude, latitude
  • GSA: GPS receiver operating mode, positioning the use of satellites, DOP value
  • GSV: Visible GPS satellite information, elevation, azimuth, SNR RMC: time, date, position, speed
$GPGSV,1,1,01,06,,,20*7C  //GPS Satellites in view
$GPGLL,,,,,,V,N*64  // Geographic position, latitude / longitude
$GPRMC,,V,,,,,,,,,,N*53  //Recommended Minimum Specific GPS/TRANSIT Data
$GPVTG,,,,,,,,,N*30 //Track Made Good and Ground Speed.
$GPGGA,,,,,,0,00,99.99,,,,,,*48   // Global Positioning System Fix Data
$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30 //GPS DOP and active satellites

NEMA 0183 Protocol

Get relevant File:NMEA0183-GPS-protocol.pdf.

SIM808 Setup

On the normal USB-TTL GSM mode, you can run the following commands to enter into the GPS mode:

  • AT+CGNSPWR=1
  • AT+CGNSTST=1

NO need to restart the module, now you can direct see on the serial monitor, we use coolterm here:

Serial of GPS data flow.png

  • Now turn of serial monitor and open NEMA monitor too, now you can the data are mapping like below:
  • Remember to setup the port and baudrate

Nema GPS data monitor.png

GNSS

  • Single GPS reach only up to 12 satellites
  • GPS+Beidou reach up to 22 satellites, Accuracy greatly improved specially city

Gnss 01.png Gnss 02.png

  • GPS+Beidou in static, or GPS only

Gnss 03.png

  • Trace of tracking, GNSS vs GPS

Gnss 04.png

Solution

Type Function Sensitivity Power Consumption Antenna Other Features
MT3339 GPS, QZSS and SBAS -165dBm, built-in LNA (2.2 dB) Tracking 3mA, 18mW only need nine passive external components
ATGM336H-5N-7X GPS, BDS, GLONASS, QZSS and SBAS, A-GNSS, 22tracking/66acquisition -162dBm Tracking <25mA Replace u-blox max series
SIM28 SIM28ML / SMT GPS, QZSS and SBAS GPS, QZSS and SBAS, 22tracking/66acquisition -165dBm, built-in LNA Tracking 5mA, 2.8-4.3V External Power, passive or active
NEO-6M GPS, 50 channels -161dBm, Time-to-first-fix cold-start 27s 11-40mA , 2.7-3.6V
SIM808 Example Example

Datasheet

Pages in category "GPS"

The following 6 pages are in this category, out of 6 total.