Lack of information with NMEA frame read by ardupilot

ArduPlane
1

Hi, I’m new to this, and I’m a bit lost.
Could someone tell me what are the specific NMEA GPS frames ardupilot uses to establish position?

Thank you very much.
Best regards.

2

I suppose AP uses gga, rmc, vtg. My m8n also sends gsv, gsa, gll - maybe it affects accuracy.
Frequency must be 5hz or higher.

3

The frequency of the transmitting signal is above 5hz. What could be happening?

4

Rx/tx are messed up? GPS_TYPE not 5? Wrong baudrate? Wrong data?
You can check received data with serial port monitor and AP passthrough feature: https://ardupilot.org/copter/docs/common-serial-passthrough.html

5

Yes, I’m at 4800 bps, but I seem to have GPS for a while, then it goes away, then comes back, and so on constantly. Is this normal?

6

I had a similar problem until I added a rmc message to protocol.
Or it can be buffer overflow.

7

I have RMC message, which buffer?

8

It can be tx buffer at your device or rx buffer at your flight controller.
Have you checked my link? Is the data flow correct?

9

Yes, I fixed it. It was a frame-to-frame send time bug.

Thank you very much.