Determination of polarization invariants of asymmetric scattering matrix

Polarization invariants of the backscattering matrix in HV-basis are estimated for the case of an arbitrary non-reciprocal object. Two additional polarization invariants, which describe non-reciprocal properties of the object itself, are introduced supplemented to the well known Huynen-Euler invariants. Supposing the simultaneous measurement of all 8 quadratures of the scattering matrix´s elements in the monostatic radar case, closed form expressions for calculation of 8 polarization invariants are found. The given approach can be used for research of various polarization effects in remote radar sensing of artificial and natural objects.