Fine micro-Doppler analysis in ISAR imaging

In ISAR imaging, it´s well known that rotating parts of a target such as wheels or rotors induce additional features in the Doppler frequency spectrum. These features are called micro-Doppler effect and appear as sidebands around the central Doppler frequency. They can provide valuable information about the structure and motion of the rotating parts and may be used for target identification. In this paper, we propose a fine analysis of the Doppler returned by reflectors of a rotating wheel. Thanks to the to micro-Doppler signature we are able to extract information on its geometrical features (position, orientation). The method has been performed on simulated and experimental data and provides satisfactory results.