Airspeed is always 0

1

My plane has no Airspeed sensors but has GPS. I think that airspeed could estimate from GPS, but it is always 0.

Anyone could help me?

2

I set FW_ARSP_MODE as normal

3

please upload a logfile

4

https://logs.px4.io/plot_app?log=9427d0fc-f2ae-4136-ba75-d4b1f0c44298

5

this is my log
https://logs.px4.io/plot_app?log=9427d0fc-f2ae-4136-ba75-d4b1f0c44298

6

I know what. I don’t hasve airspeed but FW_ARSP_MODE set 0 (normal)，This causes the airspeed to be 0. How can I use Groundspeed as airspeed?

7

Hi,
You have very bad magnetometer data which you need to fix before worrying about airspeed.
Make sure to:

  • mount the magnetometer far away from the powercables.
  • twist the power cables
  • align the magnetometer with the autopilot as well as possible
  • calibrate far away from any metal structures etc