GNSS on 4G Module

This page will introduce the usage of the GPS/GNSS capabilities on 4G module (EM06_E). This includes how to enable the GNSS functions and get the raw satellite data from the module, And how to display the Positional data graphically.

Install minicom and open /dev/ttyUSB2 port.

$ sudo apt-get install minicom
$ sudo minicom -D /dev/ttyUSB2

Send the following commands via minicom to enable GNSS.

AT+QGPS=1
AT+QGPSGNMEA="GGA"

Obtain GPS data through /dev/ttyUSB1 port.

$ sudo minicom -D /dev/ttyUSB1

Welcome to minicom 2.8

OPTIONS: I18n 
Port /dev/ttyUSB1, 15:30:32

Press CTRL-A Z for help on special keys

$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGGA,,,,,,0,,,,,,,,*66
$GPRMC,,V,,,,,,,,,,N*53
$GPVTG,,T,,M,,N,,K,N*2C

Before you begin, install gpsd and the client programs by running the following command.

$ sudo apt install gpsd gpsd-clients

Open the gpsd configuration file.

$ sudo vim /etc/default/gpsd

Make the necessary changes to specify the correct device node.

 Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
+ DEVICES="/dev/ttyUSB1"
 
# Other options you want to pass to gpsd
+ GPSD_OPTIONS=""
 
# Automatically hot add/remove USB GPS devices via gpsdctl
+ USBAUTO="true"

Restart the services.

$ sudo systemctl restart gpsd

Start the cgps client to observe data.

$ cgps

Start the gpsmon client to observe data.

$ gpsmon