Ricerc@Sapienza

In this contribution, we investigate on the coherent bistatic scattering generated by a radar system when illuminating a rough surface. Moving from the well-known scattering theory based on the Kirchhoff approximation, we propose an extended formulation of the Fung-Eom model, by introducing a higherorder expansion on the phase term of the impinging spherical wave. We demonstrate and discuss the importance of such correction for the accurate characterization of the coherent scattering generated in bistatic radar system.

A general closed-form model for forward scatter radar signal is tested in this work referring to a representative scenario where a rectangular metallic target crosses the baseline illuminated by a spherical wave. The received signal both in near- and far-field conditions has been validated through an ad-hoc numerical implementation on a full-wave simulation tool. The detection performance obtained by using the standard far-field model and the general closed-form model are analyzed in terms of signal-to-noise ratio and relative mismatch loss.