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| Wavenumber-domain Imaging Algorithm for High Squint SAR Based on Azimuth Variation Range Model |
| DONG Qi①② YANG Zemin③ LI Zhenyu①② SUN Guangcai①② XING Mengdao①② |
①(National Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China)
②(Collaborative Innovation Center of Information Sensing and Understand, Xidian University, Xi'an 710071, China)
③(The 29th Researth Institute of China Electronics Technology Group Corporation, Chengdu 610036, China) |
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Abstract Due to the acceleration in the moving of the platform, the SAR imaging of highly squinted maneuvering platform becomes a problem to be solved urgently. The majority of currently existing range models fail in taking the azimuth-variation into consideration, so the well-focused images are not obtained. To solve these problems, a new azimuth-variation range model under the non-linear trajectory caused by acceleration is constructed. Based on this model, a wavenumber-domain imaging algorithm for high squint SAR is proposed, which takes advantage of the azimuth-variation filter to remove the azimuth chirp rate changes and Doppler center changes caused by the acceleration. By the analysis of the model error, the precision of the model is confirmed. Contrast simulation results are presented to valid the superiority of the proposed approach.
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Received: 22 July 2016
Published: 13 December 2016
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| Fund: The National Natural Science Foundation of China (61301292), The AeroSpace T.T.& C. Innovation Program (201509A) |
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Corresponding Authors:
DONG Qi
E-mail: dq544120925@126.com
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