Three-dimensional images free of sidelobe interaction effects of CLEAN have been generated by the PML algorithm. Some implementation speedups are possible and the significance of PML may extend to autofocus. Roll data while traversing a circular path is found suitable to define a curved aperture for preliminary three-dimensional ship imagery.
"Advances in three-dimensional SAR from curvilinear apertures", Proc. SPIE 3161, Radar Processing, Technology, and Applications II, (24 September 1997); doi: 10.1117/12.283951; https://doi.org/10.1117/12.283951