| Citation: | RAN Da, YIN Canbin, JIA Xinet al. Imaging approach for frequency-stepped SAR with virtual array model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(1): 82-88. doi: 10.13700/j.bh.1001-5965.2016.0943(in Chinese)
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Aimed at the problem that frequency-stepped synthetic aperture radar (SAR) images obtained by classic inverse Fourier transform method have a limit on unambiguous range, a new model which takes the pulse sequence of frequency-stepped SAR as an along-track virtual array radar signal and its corresponding imaging method for frequency-stepped SAR were proposed. Meanwhile, unambiguous imaging using modified back-projection method is realized. The virtual array model for frequency-stepped SAR signal was established and the synthesis method of high resolution range profile based on this model was presented. By embedding range migration correction and secondary phase compensation into original back-projection algorithm, a precise two-dimensional image of the target was also obtained. All the results show that the virtual array model based imaging method for frequency-stepped SAR is not restricted by the theoretical limit of frequency-stepped signal's unambiguous range and can get images without range ambiguity for wide swath imaging rapidly.
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