Quaternion-based polarimetric array manifold interpolation

Since the EADF does not inherently incorporate polarization two separate EADFs are needed to describe a single array element. Hence, we propose to use a Quaternion EADF (QEADF) that jointly interpolates both patterns. Moreover, since the QEADF is based on a Discrete Quaternion Fourier Transform it opens up some degrees of freedom with respect to the Fourier basis functions.