I received snippets of data of an IMU with 9 DoF in motion. For these I wanted to get their rotation by angles relative to the
earth frame. My goal is to receive the absolute vertical acceleration, therefore I'd like to know about the sensors rotation.
Thus I was reading about
yaw and also about AHRS Filters like
Now I have a question about the feasibility and understanding:
Since I only have snippets, I don’t know the initial sensor rotation. Is my understanding correct that the filters are only calculating the rotation relative to the last known rotation, so I‘d always have an offset of the initial orientation regarding to the
earth frame? Is it even possible to calculate the rotation having only a random snapshot and if so, what would be the best approach?
Thank you very much.