Description of Radar Target Using Resonance Based Null Polarization

By the representation of the target transient response as a series of natural resonance modes, a target feature set based on the co-polarized null states of the modes is used to represent a radar target. This is done by incorporating the mode residue terms in a scattering matrix of quadrature polarization channels, and then by the optimization (using the Lagrangian optimization procedure) of the received power (determined by the Kennaugh and Stokes formulism), the characteristic polarization state set of a mode is obtained. A 2D plane model is used to demonstrate the ability of this concept to convey a complex target physical attributes such as elongation, symmetry and tilt, the results showed that a feature set based on nulls states of the target modes is robust.