Polarization model of distributed radar object

At present, the main approach in constructing polarization models of time-varying distributed objects is connected with a priori suggestions on probability density functions (PDF) of polarization parameters (invariants) of the scattering matrix (SM). The main idea of the authors' approach consists in determination of all SM's polarization invariants statistics with the use of results of the matrix elements quadratures measurements. The Gaussian law of the quadratures' probability densities is assumed. In the paper, analytical expressions for 6 invariants of the monostatic scattering matrix are given. The available results confirm the suggested approach advisability while constructing polarization models of distributed radar objects.