Strange GPS altitude problem shoot my copter into sky

hi,

today i fly first time a pixhawk autopilot. after flying two years apm2.6 i spend my hexa a new pixhawk. everything is fine but i have a strange problem with altitude hold in mode alt-hold and position-hold. in this both modes i can increase vertical speed more than in loiter or auto mode.

and if i do this. increasing speed in position-hold or in alt-hold my copter suddenly shoot in the sky. mostly at ~11ms vertical speed.

first i was thinking this is a problem from barometer pressure. maybe caused by airflow. also i noticed that my altitude showing on taranis suddenly dropped from 25 meters to -17 meters in this moment. and of course this will spinn up motors to full throttle. but after review my log file i am unsure what caused the problem.

i noticed that CTUN BaroAlt do not droping altitude. i noticed that Gps RealAlt Drop to -17m while GPS Alt is corresponding with baro altitude. as you can see in yellow that Throttle OUT jump to 1000 while GPS Real Alt drop to -17. only switching to stabilised bring my copter back to controlled flying.

3691204613?profile=original i attached my log file and my parameter file here. maybe somebody can help me with this issue because i do not understand where the problem is.

my pixhawk runs under arducopter rev. 3.2.1 hexa x.

2015-05-10%2015-26-39.logPixhawk10_5_15.param

2015-05-10 15-26-39.log

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • solved,

    logging with imu locate the problem. i have massive accel z vibrations if copter become speed. the problem was my landing gear. one of them do not log in place correctly after gear up.

    /g

    wolke

This reply was deleted.

Activity

Liam left a comment on Agricultural UAVs
"Hi
I'm Liam from T-MOTOR. I would like to reach out to see if there is any possibility for us to work together.
We are a propulsion system manufacturer who offers motors, propellers and ESCs for all kinds of drone applications which vary from secur…"
Jun 30
Richard Cox left a comment on Australia
"Anyone in the DIYDRONES Australian subgroup based in Alice Springs, NT?
I am experimenting with Ardupilot (standard Arduplane), Pixhawk 4 FC in a 4-ch
RC "AXN Floater Jet" foamy plane..."
Jun 29
Omar Sykes left a comment on Australia
"Hi everyone, I am looking for someone who is good at drone building, repair and software in Adelaide. Please give me a call on 0477 319 219."
Jun 29
More…