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problem about Seven-Parameter Magnetic Calibration Model

Question asked by pengcheng li on Jun 12, 2016

Hi all, in application note AN5019, section 5.4(Inverse Soft-iron Matrix), formula(93), what if one of beta is negative? Then perform the sqrt is not allowable.

We make beta_0*beta_1*beta_2 to be positive in section 5.2, but we can not make sure beta_0,beta_1 and beta_2 all be positive, right?

What am I missing?