Radar target recognition based on some invariant properties of the polarization

In order to meet the needs of radar target recognition (RTR), a method using some invariant properties of the polarization scattering matrix (IPPSM) is presented. A simulated cone model of missile is used to test in microwave darkroom experiments, a new IPPSM is first presented, its physical characteristic is also given. All the IPPSMs are analyzed, the experiment results imply that Determinant|Δ|, Trace of Power Scattering Matrix P
1
, Module of Polarization Ellipticity |τ
0
|, Polarization Combination Coefficient η are invariant with the orientation angles. From the Depolation D, Polaization Ellipticity τ
0
, we know that the target has multi-scattering centers and is symmetric which are true for the real target, so a 7-dim polarization vector X=(|Δ|, P
1
, D, φ
0
,τ
0
,|τ
0
|,η) can be usefully obtained for radar target recognition.