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Motors stopped at 100 metres while in LANDING mode
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<blockquote data-quote="suprPHREAK" data-source="post: 48905" data-attributes="member: 1505"><p>I'm having trouble figuring that out. I looked at the logs. Solid GPS throughout. Due to the altitude, it was flying based on GPS and barometer (IMU altitude). A couple errors do appear:</p><p></p><p>At 7:18.8-there is a very brief SPEED ERROR. In the previous full second, it lost almost 20ft. 6m/s decent rate! That does corroborate what OP said.</p><p></p><p>In the next second, you can see the bounce, as altitude on VPS hits zero, then increases.</p><p></p><p>At 7:19.4 there is a "GPS Position NoMatch" error. I'm not sure what that means, or what it is matching to.</p><p></p><p>One thing I see that maybe the OP can clear up: the landing altitude is -6.9ft below take off altitude. Did you land somewhere below where you took off? </p><p></p><p>If not, perhaps the IMU barometer (used to determine altitude) is giving a false reading, leading to bad behaviour. Something that suggests this may be true is the IMU altitude drops 0.3ft even after VPS has determined it is at zero.</p><p></p><p>I suspect the GPS readings are all accurate, as in other logs I've looked at, it always seems to track well even if there are other errors.</p></blockquote><p></p>
[QUOTE="suprPHREAK, post: 48905, member: 1505"] I'm having trouble figuring that out. I looked at the logs. Solid GPS throughout. Due to the altitude, it was flying based on GPS and barometer (IMU altitude). A couple errors do appear: At 7:18.8-there is a very brief SPEED ERROR. In the previous full second, it lost almost 20ft. 6m/s decent rate! That does corroborate what OP said. In the next second, you can see the bounce, as altitude on VPS hits zero, then increases. At 7:19.4 there is a "GPS Position NoMatch" error. I'm not sure what that means, or what it is matching to. One thing I see that maybe the OP can clear up: the landing altitude is -6.9ft below take off altitude. Did you land somewhere below where you took off? If not, perhaps the IMU barometer (used to determine altitude) is giving a false reading, leading to bad behaviour. Something that suggests this may be true is the IMU altitude drops 0.3ft even after VPS has determined it is at zero. I suspect the GPS readings are all accurate, as in other logs I've looked at, it always seems to track well even if there are other errors. [/QUOTE]
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Motors stopped at 100 metres while in LANDING mode