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27 August 2001 Performance analysis of fast backprojection for synthetic-aperture radar processing
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Exact SAR inversion for a linear aperture may be obtained using fast transform techniques. Alternatively, backprojection in time domain may be used which can also handle general curved apertures. In the past, however, backprojection has seldom been used due to its heavy computational burden. We show in the paper that the backprojection method can be formulated as an exact recursive method based on factorization of the aperture. By sampling the backprojected data in local polar coordinates it is shown that the number of operations is drastically reduced and can be made to approach that of fast transform algorithms.
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Lars M.H. Ulander, Hans Hellsten, and Gunnar Stenstroem "Performance analysis of fast backprojection for synthetic-aperture radar processing", Proc. SPIE 4382, Algorithms for Synthetic Aperture Radar Imagery VIII, (27 August 2001);

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