# Altitude Fluctuation in Missions

**URL:** <https://discuss.px4.io/t/altitude-fluctuation-in-missions/14416>\
**Category:** PX4 Autopilot\
**Created:** [December 22, 2019, 9:10pm UTC](https://discuss.px4.io/t/altitude-fluctuation-in-missions/14416 "2019-12-22T21:10:23Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jordancoult](https://discuss.px4.io/user_avatar/discuss.px4.io/jordancoult/32/4456_2.png) [@jordancoult](https://discuss.px4.io/u/jordancoult)\
**Post date:** [December 22, 2019, 9:10pm UTC](https://discuss.px4.io/t/altitude-fluctuation-in-missions/14416/1 "2019-12-22T21:10:23Z")

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When flying a basic mission with constant altitude waypoints, the drone’s altitude erroneously fluctuates several meters. When at a waypoint, the drone climbs to the correct altitude–but while it travels to the next waypoint, it slowly loses altitude. Here’s a snippet from the flight log:

 ![0771_AltitudeGraph](https://discuss.px4.io/uploads/default/original/2X/1/1c7fc22aca8bf864d2fc07c021e821330f159e94.png)  
These results have repeated on Pixhawk 1, Pixhawk Cube, PX4 v1.8.2, and PX4 v1.9.2, and different GPSs. The problem doesn’t exist when flying in other auto altitude-controlled modes, and the drone is not under-powered.

Mission:

- Mission Start - 0m
- Takeoff - 8m rel to home
- Waypoint - 8m rel to home, 5sec hold
- Waypoint - 8m rel to home, 5sec hold
- Waypoint - 8m rel to home
- Waypoint - 8m rel to home
- Waypoint - 8m rel to home
- Waypoint - 8m rel to home

[Video of Flight](https://youtu.be/sw8blMnCA84)  
[Log File Analysis (Flight Review)](https://review.px4.io/plot_app?log=624517a3-9159-415c-8974-4fc790206f6f)

Any input is appreciated. Thanks a lot!

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**Author:** ![Vibhu\_Tripathi](https://discuss.px4.io/user_avatar/discuss.px4.io/vibhu_tripathi/32/4089_2.png) [@Vibhu\_Tripathi](https://discuss.px4.io/u/Vibhu_Tripathi)\
**Post date:** [December 24, 2019, 12:36pm UTC](https://discuss.px4.io/t/altitude-fluctuation-in-missions/14416/2 "2019-12-24T12:36:42Z")

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I see heavy vibrations. You need to isolate your Flight Controller. [https://docs.px4.io/v1.9.0/en/assembly/vibration\_isolation.html](https://docs.px4.io/v1.9.0/en/assembly/vibration_isolation.html)

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**Author:** ![jordancoult](https://discuss.px4.io/user_avatar/discuss.px4.io/jordancoult/32/4456_2.png) [@jordancoult](https://discuss.px4.io/u/jordancoult)\
**Post date:** [December 31, 2019, 6:50pm UTC](https://discuss.px4.io/t/altitude-fluctuation-in-missions/14416/3 "2019-12-31T18:50:52Z")

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Thanks for the suggestion. We tested this a different time with a different aircraft with low vibration levels, but still had the same problem.

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**Author:** ![Sanatan\_Biswal](https://discuss.px4.io/user_avatar/discuss.px4.io/sanatan_biswal/32/11508_2.png) [@Sanatan\_Biswal](https://discuss.px4.io/u/Sanatan_Biswal)\
**Post date:** [May 30, 2025, 9:44pm UTC](https://discuss.px4.io/t/altitude-fluctuation-in-missions/14416/4 "2025-05-30T21:44:30Z")

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Did you solve the issue.??  
If yes can you share how you solve it???