I have a question about calibrating an eCompass in the Presence of Hard- and Soft-Iron Interference. How to compute an optimal ellipsoid fit A In this formula (R-R_0)^T*A*(R-R_0 )=const at application note an4246
Please refer to AN5019 which is a more recent document.
It can be used as a reference against the algorithm in file "magnetic.c" in the NXP Sensor Fusion Kit.
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