NovAtel OEM7 GNSS Receiver Not Providing GPS Fix with Pixhawk (ArduCopter 4.5.7) Using NMEA on Serial Port

Pixhawk
1

I’m integrating a NovAtel OEM7 GNSS receiver with a Pixhawk flight controller running ArduCopter 4.5.7. The receiver is mounted on an OEM7 development kit and connected via the serial port (COM1). I’ve configured the receiver to use the NMEA protocol at a baud rate of 115200.

On the Pixhawk side, using Mission Planner, I set the baud rate to 115200 and GPS_TYPE to NMEA. Despite these settings, the system does not achieve a GPS fix.

Interestingly, when I replace the OEM7 GNSS receiver with a Here3 module connected via CANBUS, the GPS fix is obtained without any issues.

Has anyone encountered a similar issue or can suggest troubleshooting steps to diagnose why the OEM7 receiver’s NMEA data isn’t being processed correctly by ArduCopter? Any guidance on configuration adjustments or wiring considerations would be greatly appreciated.

Thank you!

2

Hey @gbh welcome to the community, it’s good to have you.

I think your issues are 100% relates to Ardupilot, I suggest you try on their forums, you’ll likely get an answer.

3

Thanks, Yes you’re right, worth trying here too.