Uniqueness of Target Decomposition Theorems in Radar Polarimetry

A key question in radar polarimetry is the existence of a target dichotomy ie. the existence of more than one target decomposition theory. In this paper we show, by using a coherency matrix approach, that there is no target dichotomy and subsequently only one unique target decomposition. We illustrate its usefulness by giving two examples; the scattering of light by small anisotropic particles and rough surface scattering under physical optics.