An extensive 3D radar cross-section (RCS) data set has recently been acquired at the HARC Microwave Imaging Facility. This data set includes diversity in azimuth and elevation through antenna placement as well as frequency diversity. The addition of elevation diversity to standard Inverse Synthetic Aperture Radar (ISAR) imaging allows 3D object reconstruction, as opposed to the 2D defocused projections obtained by conventional ISAR. The method, based on spherical collection and a paracentric approximation for the target space, relates the reconstruction to the acquired data by a 3D Fourier transform. Resulting images are presented for full- and quasi-3D reconstructions, including 2D tomographic slices of the 3D target and a focused projection of the 3D target data onto a single horizontal plane.<<ETX>>
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