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Range Migration Algorithm (RMA) can perfectly fulfill the focusing of the whole scene under the condition of wide aperture and large squint angles. However, Stolt interpolation is needed in regular RMA and is time-consuming. In this paper, an improved RMA algorithm based on Nonuniform FFT (NUFFT) is developed for SAR imaging. NUFFT is substituted for the Stolt interpolation and range IFFT in the improved...
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