BNO055 sensor fusion algorithm

Hello, 

I am working right now with the IMU BNO055. I am using NDOF fusion mode to extract orientation measurements in real time, both in quaternions and in Euler angles. I want to have an Idea how the sensor fusion algorithm works. 

which operations  are convicted to transform the gyro/acc/mag data into Euler angles and/or quaternions ? 

Is there a published document describing how the fusion works ? if not i would appreciate a general idea of how the algorithm works 

 

thank you! 

 

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