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fix NED ENU conversion #143

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Stapelzeiger
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The NED to ENU conversion flips the axes by 180 degrees around an axis that is between the x & y axes.

This was correctly implemented for the angular rate & acceleration, but not the quaternion of the estimated attitude.

This PR fixes the quaternion transformation.

@Stapelzeiger
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likely fixes #137

@dawonn
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dawonn commented Dec 4, 2024

Would it be possible to implement this without the additional eigen dependentcy?

@Stapelzeiger
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It should be very doable to write out the expression by hand. I won't have time to do it in the next weeks though.

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