Radar imaging of PEC targets using limited scattered information

Electromagnetic scattering information of a PEC target has been popularly used in modern radar systems. Among all the kinds of aircraft detection theory, target imaging has attracted increasing interest because it can give more particular details of the shape or location of the aircraft than others. The theory of inverse scattering identity using physical optics (PO) approximation was discussed by N.N. Bojarski as early as in 1982. He established a Fourier transform relationship between the PEC target and a form of the scattering field, but the method is hard to satisfy in practice. We mainly discuss 2-dimensional (2D) target imaging. We introduce inverse scattering theory based on PO. We then discuss the influence of the limited frequency, and use Pade-extrapolation to approximate the scattering information in all directions around the target from the result of limited scattering directions, which can be conveniently obtained in practical applications.