Imaging of unknown targets from measured scattering data

We have adopted a simple signal-processing-based approach to solving the inverse-scattering problem. We have applied these techniques to real data, measured at Rome Laboratory using microwaves, and to model targets whose structure is known a priori, the so-called Ipswich mystery data. Making these data available to the imaging community at large, but without revealing the structure of the target, has proven to be a very important exercise when it comes to comparing different inversion techniques and their claimed success. In our case, data were processed using an inversion method based on cepstral filtering. All of the so-called mystery targets were imaged, although their resolution was poor. The poor resolution results in part from the limited number of data points used in the inversion step.