Hi,
a few days ago i started experimenting with the takeoff-waypoint.
first flight was ok, but since then i have a good chance that the value for altitude is corrupted before takeoff (although i have 7,8,9 satellites)
this might be coincidence and have nothing to do with the auto-takeoff...
i added the log and a screenshot for clarity.
i went through some logs and didnt find anything unusual.
more of these logs are available, on one of them 1500m are "lost" within 1 or 2 seconds, so a mission that was supposed to take place at 150m would have taken place at 1650m (i aborted before i lost sight of my plane)
anyone seen this before ?
what could it be?
regards,
wolfgang
Replies
Hi,
I did not study your log so this answer is only relevant for your if you see a large altitude variation shortly after powerup, which then becomes more stable but still wrong by a constant amount -
The APM uses its "home" altitude through the flight for several things. One of them is to offset the barometer altitude.
APM is too early in accepting a home position - it often happens (for me) when GPS altitude is still 100s of meters off.
Therefore, always check alt. via telemetry and re-set home alt. via MP of it is off. Or, press the reset button on APM to captue a new and more accurate home pos from GPS (which is not reset).
I hope this can somehow be improved soon. Trying myself to come up with a good solution.
Regards
Soren
I'm not a plane expert (more on the copter side) but the gps altitude is notoriously inaccurate especially if you're using a mediatek. Baro altitude is very susceptible to wind blowing across the baro so if you're apm is out of a case and/or doesn't have a spong over it that could be the cause.