Just to clarify, it looks like your LAT/LON-position don’t change that much in Loiter, just that your altitude is rising. Is that what you experiencing?
I get the feel that almost all your engagements to LOITER happens just after the UAV has started a small accent, and keeps rising till you enter STABILIZE mode - correct? The ThrIn and ThrOut is almost unchanged, except a small hump of increased ThrOut just after LOITER engaged. That makes me feel like somehow your UAV wants to climb in LOITER, which I don’t understand why. Have you tried ALT HOLD any?
(This all looks awfully close to my current problem Check the post “AltHold not responding” from 30th Sept.)
in my log i cant see any logs for vibration. if any one can explain than its good that from where i can get my boards vibration data.
engagements to LOITER happens just after the UAV has started a small accent, and keeps rising till you enter STABILIZE mode - Ya after disabling loiter its stop to climbing.
now really frustrated from this problem, every thing is fine set count is 9-10 with good 3D fix. HDOP is near by 1.44-2 and still loiter issue.
if some one guide me to solve this issue than well and good.
You have to activate the IMU logging on an APM as this is switched off by default. This is because it sucks up lots of cpu power and an APM can get saturated if You fly around with it on by default.
Well, your vibration values for Z spikes outside limits, and X and Y seem well within limits.
Between the Z-spikes, your vibrations along that axis is good… anything loose on your UAV, that reverberates with change of thrust or speed-induce wind?
Maybe a cable or similar, that sometimes touch the APM housing intermittently?
Did you attach your APM on a piece of foam or any other means of vibration isolation?
Yeah, you still have the climb during Loiter. However, I still can only see Loiter engaged while the UAV is ascending/climbing. What happens if you engage Loiter in a decent?
Ok. Looks good. Maybe a slightly tensioned black cable splitting in to two, at right in the second last picture. Any way, I would be surprised if those vibration peaks would create such repetitive error in altitude when in Loiter mode. In this matter, very like my problem, and I can’t understand the cause yet.