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In this paper, we present a detailed analysis on the invalidation of the polar format algorithm (PFA) for the dechirped echo signals in inverse synthetic aperture radar (ISAR) imaging. After the data- driven translational motion compensation, the polar section of the dechirped signals is often undermined, and then the PFA is invalid. A revision method by range shifting is proposed to compensate the echo signals, and the standard polar section is obtained. An improved performance was achieved on the simulated and real data experiments. The theoretical analysis and the proposed method are confirmed.

INVALIDATION ANALYSIS AND REVISION OF POLAR FORMAT ALGORITHM FOR DECHIRPED ECHO SIGNALS IN ISAR IMAGING