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Efficient Pseudopolar Format Algorithm for Down-Looking Linear-Array SAR 3-D Imaging
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DOI：10.1109/LGRS.2014.2351792.png)
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In this letter, a novel 3-D imaging algorithm for down-looking linear-array synthetic aperture radar is presented. The usual algorithms involve either time-consuming interpolations or huge oversampling operations, which adds huge burden to the image formation processor. The proposed algorithm, in contrast, is not only accurate because little approximation has been made but also quite efficient because of two major endeavors that we have made: First, a novel 3-D pseudopolar domain is introduced for the focused data to avoid any oversampling and to make it possible to formulate the image formation process as an interpolation-free image series expansion, and second, convergence acceleration theory in computational mathematics is introduced to accelerate the convergence of the image series expansion. The 3-D imaging capability is evaluated, and the validation of the proposed algorithm is done by exploiting simulated data.
Keyword:
Convergence acceleration
linear-array synthetic aperture radar (LASAR)
pseudopolar format
3-D imaging
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