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| Imaging Algorithm of High Squint Spotlight SAR Based on Azimuth Deramp and Nonlinear Frequency Scaling(NFS) |
| Wu Yong①② Song Hong-jun① Peng Jin③ Liu Han-yan①② |
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
②(Graduate University of Chinese Academy of Sciences, Beijing 100039, China)
③(Department of Electronic and Information Engineering, Chuzhou University, Chuzhou 239000, China) |
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Abstract To eliminate the azimuthal spectral folding of spotlight Synthetic Aperture Radar (SAR) and the serious coupling between range and azimuth in high squint mode, an algorithm based on azimuth deramp and Nonlinear Frequency Scaling (NFS) is proposed. First, azimuth deramp operation eliminates the azimuthal spectral folding. Then nonlinear frequency scaling compensating the azimuth phase with the range scale variation is adopted to fulfill the focusing of the swath. Simulation results illustrate that it can eliminate azimuthal spectral folding, possess high precision and satisfy the imaging quality of high squint spotlight SAR and large scene swath.
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Received: 25 September 2009
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Corresponding Authors:
Wu Yong
E-mail: johnsonwuyong@hotmail.com
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2010, Vol. 32 
