Does it work in free fall?

[Sofus199]

Does your code work in free fall or with acceleration like on a rocket? I can see in your code that you estimate gravity to get orientation, is that right? Because when it is in free air you can not detect gravity, so will the magnetometer just take over or will it make crazy yaw, pitch and roll values?

Thanks for your attention. I'm looking forward for your reply.

[kriswiner]

The 9 DoF sensor certainly works in high G and free fall environments, but the AHRS solution will likely be inaccurate when the inertial acceleration is on the order of gravity or higher. The magnetometer calibration might also be affected when far from the Earth's surface. I just don't know, never having tested absolute orientation estimation sensors in this environment. Best and cheapest way is simply to test it.

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On Sat, Jun 5, 2021 at 1:29 AM Hanberg Engineering ***@***.***> wrote: Does your code work in free fall or with acceleration like on a rocket? I can see in your code that you estimate gravity to get orientation, is that right? Because when it is in free air you can not detect gravity, so will the magnetometer just take over or will it make crazy yaw, pitch and roll values? Thanks for your attention. I'm looking forward for your reply. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#460>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKRM2YEBUKQCHJEZTN3TRHN6JANCNFSM46EIK65Q> .

[Sofus199]

Thanks for quick reply!
Do you know if it works with any airborne application like quadcopters, airplanes, etc...
Without having tried, do you think it is possible to get orientation using only the gyroscope and the magnetomter?

[kriswiner]

Works great with UAVs, we use this solution all the time for headless flight. It works and is being used in airplanes but as I mentioned, on hard banks where the g forces approach gravity the solution suffers. This is a long-standing problem in need of a solution. We have some ideas but this is R&D at the moment. Roll and pitch can be estimated pretty well with just an accel. For accurate heading, you need all three...or 9 DoF. You might want to put a baro on the board as well as we usually do, so 10 DoF since modern baros estimate altitude within <10 cm

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On Sat, Jun 5, 2021 at 8:27 AM Hanberg Engineering ***@***.***> wrote: Thanks for quick reply! Do you know if it works with any airborne application like quadcopters, airplanes, etc... Without having tried, do you think it is possible to get orientation using only the gyroscope and the magnetomter? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#460 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKVWIHROCOZBJIFX3FLTRI67PANCNFSM46EIK65Q> .

[Sofus199]

Thanks again!
I'll try it out. Learn by doing.