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| SUPER-RESOLUTION IMAGING AND TARGET FEATURE EXTRACTION IN THE PRESENCE OF WAVEFRONT CURVATURE EFFECTS |
| Sun Changyin; Bao Zheng |
| Key Lab. for Radar Signal Processing Xidian University. Xi an 710071 China |
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Abstract Wavefront curvature defocus effects can occur when Polar Formatting Algorithin(PFA)is used to reconstruct the SAR image. The traditional approach to this situation is simply to limit the size of the scene reconstructed. From the aspect of super-resolution, it is demonstrated in this paper that by accurate estimation and post compensation of the space-variant Quadratic Phase Errors(QPEs), super-resolution image and target features can still be obtained in the presence of wavefront curvature effects. The estimate. of QPEs is roughly obtained by use of the Discrete Polynomial-Phase TranSfornl(DPT), then it is refined by a RELAX-based parametric
estimation rnet.hod. Experimental results show the effectiveness of the, proposed method.
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Received: 30 July 1999
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2001, Vol. 23 
