estimatedCovariance

Gets estimated covariance matrix for estimated accelerometer parameters or null if not available. When bias is known, diagonal elements of the covariance matrix contains variance for the following parameters (following indicated order): sx, sy, sz, mxy, mxz, myz, mzx, mzy. When bias is not known, diagonal elements of the covariance matrix contains variance for the following parameters (following indicated order): bx, by, bz, sx, sy, sz, mxy, mxz, myx, myz, mzx, mzy.