A Novel Approach for Ground Moving Targets SAR Imaging Based on Second Order Keystone Transform

2013 ◽  
Author(s):  
Yangyang Liu ◽  
Daiying Zhou
Keyword(s):  
Second Order ◽  
Moving Targets ◽  
Keystone Transform ◽  
Novel Approach ◽  
Sar Imaging

New Approach for SAR Imaging of Ground Moving Targets Based on a Keystone Transform

2011 ◽  
Vol 8 (4) ◽  
pp. 829-833 ◽  
Author(s):  
Yang Jungang ◽  
Huang Xiaotao ◽  
Jin Tian ◽  
John Thompson ◽  
Zhou Zhimin
Keyword(s):  
Moving Targets ◽  
New Approach ◽  
Keystone Transform ◽  
Sar Imaging

scholarly journals Refocusing of Ground Moving Targets with Doppler Ambiguity Using Keystone Transform and Modified Second-Order Keystone Transform for Synthetic Aperture Radar

2021 ◽  
Vol 13 (2) ◽  
pp. 177
Author(s):  
Jun Wan ◽  
Xiaoheng Tan ◽  
Zhanye Chen ◽  
Dong Li ◽  
Qinghua Liu ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Doppler Frequency ◽  
Second Order ◽  
Synthetic Aperture ◽  
Moving Target ◽  
Moving Targets ◽  
Cross Term ◽  
Keystone Transform ◽  
Spurious Peak ◽  
Aperture Radar

Ground moving targets will typically be defocused because of the range migration (RM) and Doppler frequency migration (DFM) caused by the unknown relative motions between the platform of synthetic aperture radar (SAR) and the ground moving targets. The received signal of the ground moving target easily exhibits the Doppler ambiguity, and the Doppler ambiguity leads to the refocusing difficulty of ground moving targets. To address these problems, a SAR refocusing method of ground moving targets with Doppler ambiguity based on modified second-order keystone transform (MSOKT) and keystone transform (KT) is presented in this paper. Firstly, the second-order phase is separated by the time reversing process. Secondly, MSOKT is performed to compensate the range curvature migration and DFM, and then the coefficient of the second-order phase is estimated. Finally, a well-refocused result of the moving target is achieved after KT and the estimated Doppler ambiguity number are used to eliminate residual range walk migration. The proposed method can accurately remove RM and DFM and effectively focus the moving targets without residual correction errors. Moreover, the effects of Doppler ambiguity (including Doppler center blur and spectrum split) and blind speed sidelobe are further avoided. On the basis of the analysis of cross-term for the multiple target case, the identification strategy of spurious peak of cross-term is proposed. Additionally, the developed method can be sped up by nonuniform fast Fourier transform without the interpolation operation. The effectiveness of the proposed method is verified by both airborne and spaceborne real data processing results.

A Fast SAR Imaging Method for Ground Moving Target Using a Second-Order WVD Transform

2016 ◽  
Vol 54 (4) ◽  
pp. 1940-1956 ◽  
Author(s):  
Penghui Huang ◽  
Guisheng Liao ◽  
Zhiwei Yang ◽  
Xiang-Gen Xia ◽  
Jing-Tao Ma ◽  
...  
Keyword(s):  
Second Order ◽  
Imaging Method ◽  
Moving Target ◽  
Sar Imaging
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