Pretty green at this and need some help to diagnose a problem:
I'm flying an IRIS+ with a gopro session and a samsung S4 on the bottom to provide a cellular telemetry link.
The issue i'm seeing is that as it flies a mission, it keeps pausing for a second or so and then will move on. On the video, i see the pitch go nose down a bit as it flies to next WP at 10m/s, but it keep leveling out, pausing, and then continuing on. It appears to be doing this between waypoints.
I downloaded the telemetry, and it is most obvious as pitch variations which goes positive every 10 seconds or so it seems. On the mission, i had to abort and land halfway because it was not making time and was heading for a battery failsafe.
It did not do this for the whole mission, just for the beginning and middle.. I have noticed the behavior on a few flights now.. does anyone have an idea of what could cause this?
Appreciate the feedback! thanks.
Harry
Replies
Found this in the log using the 'auto analysis':
Test: Compass = WARN - Moderate change in mag_field (31.74%)
this seems to be the only warning.
Since the problems is evidenced by the pitch changes, i checked the ATT logs despitch vs pitch - i can see that these traces are aligned.
following the auto analysis warning, i do see some 'spikey' activity on the magx signal. the magy looks good with small steps changes i assume are due to turning at each waypoint.
i looked at vibrations, and i don't see anything abnormal according to the ranges in the mission planner flight analysis guides.
At this point, i want to understand the mag signal to figure out if something could be affecting that sensor. And, would these problems cause the 'leveling' i see during flight.
going to review some older flight logs to see if this is normal, or something new.
For anyone noticing a simliar issue, i believe this problem is the result of altitude changes during waypoints changes. If i don't change altitude, i don't get the pauses and delays during flight. Therefore, i conclude that there is a tuning or programming issue to be performed.
Thanks for the reply- what are the best signals to monitor to check vibration? I will search around for this an the normal ranges. Would excessive vibration cause something to 'pause'? Forgot to mention - little to no wind at all on this mission.
I upload the t log if anyone can help. Thanks.
Harry
looking forward to 3.3.4 and new ekf with separate filters for each imu :)