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High resolutio ISAR imaging of high speed moving targets

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3 Author(s)
Xing, M. ; State Key Lab. for Radar Signal Process., Xidia Univ., Xia Shaanxi, China ; u, R. ; Bao, Z.

Range-Doppler (RD) algorithms are idely used i inverse synthetic aperture radar (ISAR) imaging. I the standard RD algorithm, envelope alignment and autofocus are first applied to transform the original data into equivalent turntable target data, and the FFT is used for the image formation. Usually, the migratio through resolution cells (MTRCs) due to target rotatio is ignored. ith the improvement of resolutio or the increase of target size, MTRCs cannot be ignored and must be mitigated. For high speed moving targets, the most idely used 'stop-and-go' data model is violated. I this case, the mitigation of MTRCs becomes eve more complicated. I the paper, technical issues associated ith high resolutio ISAR imaging of high speed moving targets are addressed. A preprocessing algorithm is first proposed to convert the non-coherent ra ISAR data into coherent data, the a keystone formatting algorithm developed for the imaging of slo ground moving targets i SAR is applied to mitigate the MTRCs o ing to rotational motion, and, finally, a high resolutio time-frequency analysis based range-instantaneous Doppler (RID) algorithm is used to produce the focused ISAR image. Numerical examples are provided to illustrate the performance of the proposed approach.

Published in:

Radar, Sonar and Navigation, IEE Proceedings -  (Volume:152 ,  Issue: 2 )

Date of Publication:

8 April 2005

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