Abstract

We study the problem of extracting target features by means of synthetic-aperture radar (SAR) in the presence of uncompensated aperture motion errors. A parametric data model for a spotlight-mode SAR system is established. The Cramér–Rao bounds (CRB’s) for the parameters of the data model are also derived. The CRB analysis shows that the unknown motion errors can significantly affect the accuracy of a common shift of the scatterer positions in the cross-range direction but have little effect on other target parameters, including the accuracy of the relative positions in the range direction. A relaxation-based motion compensation RELAX (MCRELAX) algorithm for estimating both target features and motion errors is devised. Simulation results show that the mean squared errors of the parameter estimates obtained by using the MCRELAX algorithm can approach the corresponding CRB’s. We also use a couple of examples to show that MCRELAX can simply be used for motion compensation only and can give good motion-compensation results.

© 1998 Optical Society of America

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