Imaging of strongly-scattering targets from real data

Measured bistatic scattered fields for five new targets were added to the Ipswich data set. Three of the targets remained a mystery until revealed at a special session on image reconstruction from real data, at the 1996 IEEE AP-S International Symposium and URSI Radio Science Meeting in Baltimore. We provided coherent scattered-field data for more complicated scattering structures, as well as many more transmit-illumination directions, or views, than we had previously. Reconstructions corresponding to the first. We show back-propagated images of all five targets, using aspect diversity in diffraction tomography at a 3 cm wavelength. As expected, those targets that possess multiple-scattering effects, and/or have high contrast, fail to image properly. Targets from the Ipswich data set may serve as a useful standard against which researchers, involved in inverse scattering, can compare the merits of their inversion algorithms.