Reply To: GPS-IMU v4 Weak GPS signal (and picks up GPS satellites only)

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#17668
Mark Williams
Keymaster

Hi

If you want to see NMEA sentences in gpsmon, kill gpsd using sudo killall gpsd Then run gpsmon specifying the serial interface gpsmon /dev/serial0

You should be able to see the HDOP value, this is a good indication of accuracy;
https://ozzmaker.com/gps-position-accuracy-and-how-to-tell-if-you-have-a-good-fix/

For the second GPS, if HDOP is between 0.5-1.2.. seeing other GNSS will not improve the accuracy greatly.
If the HDOP is really high.. then check these two items;
-switch is set to Ext for external antenna. (I assume you already have this set)
-If using external antenna which uses SMA-uFl adapter.. make sure all screws ands nuts, especially on the back of the SMA connector, are tight

 

 

You could also try a more aggressive reset which resets the entire module
echo -e -n "\xb5\x62\x06\x04\x04\x00\xff\xff\x01\x00\x0e\x61" > /dev/serial0

You can also use U-Center to see what exactly is happening.
https://ozzmaker.com/using-u-center-to-connect-to-a-raspberry-pi-with-an-attached-berrygps-imu-gsm/

Mark --OzzMaker.com --

Blip, blop, bloop...