The minimum sample region required to predict the far-field RCS from the bistatic near-field data

For complex targets, a full bistatic near-field scattering data is required for measuring the far field radar cross section (RCS) in principle, but the acquisition time and the computational effort may be prohibitive. In this paper, we consider the far-field monostatic RCS is presented by exploiting only the near-field data relative to an angular region centered on the direction of interest, this area is the minimum sample region. Since the corner reflector is a typical multiple scattering structure, the size of the surface scanned from the near-field depends on scattering characteristics of the target. Analyses were conducted on the near-field data, we can found a zone which contains mutation of scattering characteristic. When collecting the bistatic near-field scattering data, most of the scattering information of the target can be obtained as long as the mutation zone is covered. Therefore, a fast and efficient algorithm is obtained through the analysis and simulation.