CCAM
lvl.3
Flight distance : 3543 ft
United States
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Skyveyor112 Posted at 6-9 17:27
It could be one of two things or a combination of both: 1) Incorrect elevations in the terrain model. It should be elliptical height. 2) You are flying on a non-standard day. The Phantom 4RTK doesn't seem to calibrate the barometer to the home point elevation, isntead it appears to use 29.92. Please see this post for more information. https://forum.dji.com/forum.php? ... =192850&pid=1999862
My test data is 7 months old. I am hopng a subsequent firmware release has fixed the problem, but I haven't tested the latest release.
Sounds like you are correct. This is the response I received from DJI support.
"We are grateful to assist you with your concern. Regarding this issue, if the RTK signal is not FIX, the drone will preferentially use the barometer and GPS to set its altitude. However, the value of the barometer is very easy to be affected by the external environment such as temperature or wind.
In general, there are many factors that can affect the barometer.
For GPS, the most important thing is the number of stars. The more stars there are, the more accurate the value is, and vice versa. Environmental interference will also influence GPS.
Please ensure your RTK signal is FIX when you execute this mission. Or you will see the height in GS RTK isn't accurate as what you set up in App, please execute the flight mission when RTK signal is fixed. Then your aircraft will use RTK to help its position, which is more reliable than GPS and barometer. " |
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