FEKO based ISAR analysis for 3D object reconstruction

In this paper, we constructed a 3D ISAR image to better understand electromagnetic scattering by an electrically large PEC cylinder. Imaging in this context is simply the reconstruction of the spatial distribution of the conductivity of the imaged target, σ(x, y, z). According to the geometric theory of diffraction (GTD), if the wavelength at the operating frequency is small relative to the target size, then the scattered field consists of contributions from a number of electrically isolated scattering centers. ISAR imaging algorithms rely upon an assumption that the area under observation consists of a collection of infinitesimally small isotropic scatterers (i.e., the point scatterer model). This approximation is based upon the application of a scalar contrast function which ignores directional dependency, since point scatterers radiate isotropically in all directions. 3D image reconstruction is obtained through retrieval of the scalar reflectivity function from simulated data, which provides information regarding the target under investigation.