1 April 2003 ISAR image distortion due to small perturbed motion and restoration of distorted images by time-frequency analysis
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Abstract
Gross distortion on ISAR images due to small perturbed target motion is experimentally verified. Quantitative results obtained under controlled experimental conditions on the target's motion have confirmed that large distortion in the ISAR image of the target can occur. The distortion is a consequence of the phase modulation effect in the radar return signal, as a result of small fluctuating perturbed motion of the target. This gives rise to distortion of the image in the cross-range direction. The distortion can be refocused by applying time-frequency analyiss. The Short-Time Fourier transform is used in this paper to examine some of the issues in refocusing distorted ISAR images.
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Silvester K. Wong, Grant Duff, Edward Riseborough, "ISAR image distortion due to small perturbed motion and restoration of distorted images by time-frequency analysis", Proc. SPIE 5102, Independent Component Analyses, Wavelets, and Neural Networks, (1 April 2003); doi: 10.1117/12.486054; https://doi.org/10.1117/12.486054
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