Abstract
We analyzed three existing methods for improving azimuth resolution for distributed SAR system in this paper: to extend equivalent Doppler spectrum in time domain, which improves resolution while leads to spectrum overlapping and worsen results; to improve spectrum utilization and realize full|aperture imaging, which results in considerable computational complexity; to carry out spatial filtering by means of statistics and estimation, which enlarges imaging area while maintains theoretical resolution and results in amazing computational complexity for pseudo|inverse of matrix. In view of the shortcomings of these methods, we proposed a spatial frequency filtering approach to improve the synthesized spectrum to overcome them. We presented computer simulations to validate the proposed method.
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