Automated landing missing flare and leaving throttle on after landing

#1

This was my first automated landing with PX4 https://logs.px4.io/3d?log=ebdf63a3-c3c6-4b6c-899b-29e036cd545e

Needs some repairs and tuning to test again. Comments of course welcome.

#2

@mijarven it looks like you have a number of issues going on. Possibly all related to vibration, but tough to tell. The spectral density plot looks noisy and your throttle outputs seem a little wild. You are loosing signal to your GPS/Mag several times and your airspeed measurements dropping signal too. I’m guessing this is all related.

#3

In that current setup pixracer attached just with velcro using it’s 3D printed case. External GPS/mag from mRo (M8Q) used. But, I could attach pixracer better that’s for sure.

#4

@mijarven here are some of the interesting details I see in your log file:

at 1:44 there is a “ubx msg 0x0104 invalid len 64530” warning. This could be an indication of corrupt data over the GPS serial line. Check your wiring.

The GPS data stops completely 5 times, again this indicates you probably have some wiring problem. Also, for some reason the EKF only shows 2 logged GPS problem events which seems like an unrelated PX4 problem, i.e. it should be logging a message anytime GPS data disappears I would think…? (@dagar ? @Paul_Riseborough ? ):

your airspeed data is dropping in and out constantly. Probably a wiring problem again. I don’t know why there aren’t any logged messages about this, should there be? (@dagar)

I’m guessing having the airspeed drop in and out is causing the controller to do bad things with throttle, which is also hammering on and off:

overall, check your whole avionics installation.