A Novel Instantaneous Imaging of Ship Based on the Hybrid System of SAR and ISAR

It is difficult to image the moving ship imaging in the system of airborne SAR, that the echo includes multi Doppler component, caused by the three-dimension rotation, the motion of ship and the motion of airborne radar. In this paper, a method of the dual Range-Doppler (RD) model combining the hybrid imaging model of SAR and ISAR is proposed, which considers the airborne radar movement and the ship’s movement. Because of the complex motion of the target ships, the time-frequency analysis methods are studied to obtain the instantaneous images of the targets. The simulation of ship scatter model proves the feasibility and superiority of this way. The validity of the proposed algorithm is demonstrated by experiments.

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