Range dependent target scattering in the intermediate-zone

Traditionally radar cross section has been defined as a far-field parameter. This paper presents a first order methodology for modeling target scattering (equivalent target RCS) as a function of range. Developments in 3-D scattering center extraction technology provide a method for automated scattering center models to be extracted based on a given aspect angle, center frequency, and resolution. These far-field models can be used to accurately reconstruct the RCS at the extracted aspect angle. Extrapolation can be performed with respect to angle and frequency. Examples of reconstruction and angular extrapolation are given. These far-field 3-D models can be used to simulate range dependent RCS. Comparisons of range dependent data produced using the scattering center technique to baseline data sets are very favorable. This methodology provides significant advantages in areas such as data compression, efficient computation, and high fidelity target scattering simulation.