Abstract:

In radar target recognition systems, it is of great significance to determine the target size for improving the capability of identification. Considering the phase error induced by the equivalent turntable and residual translation, this paper proposes a new method to estimate effective rotation velocity for inverse synthetic aperture radar (ISAR)crossrange scaling. By extracting some featured scatterers in the range Doppler image, a time varying autoregressive (TVAR) model is invoked for the scatterers. After polyfitting the Doppler histories of the poles, effective rotation velocity and residual phase error can be calculated. One contribution of this method lies in that it can reliably implement cross range scaling. Simultaneously, the motion compensation processing can further improve the target focus. Simulation and real data experiments verify the effectiveness of this proposal.