Assessment of physical limitations of High Resolution on targets at X-band from Circular SAR experiments

In this paper, we confirm the feasibility of circular SAR images using real SAR data in both modes: two-dimensional imaging for different view angles, or three dimensional imaging mode. This new imaging possibility demonstrates clearly the strong anisotropic behavior of the main scatterers at X-band. This proves both the limitations of the autofocus tech- niques base on tracking on isotropic strong echoes for very high resolution images, and the impossibility to recover a three dimensional content by this method at X-band.