21 April 2010 Dual format algorithm for monostatic SAR
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The polar format algorithm for monostatic synthetic aperture radar imaging is based on a linear approximation of the differential range to a scatterer, which leads to spatially-variant distortion and defocus in the resultant image. While approximate corrections may be applied to compensate for these effects, these corrections are ad-hoc in nature. Here, we introduce an alternative imaging algorithm called the Dual Format Algorithm (DFA) that provides better isolation of the defocus effects and reduces distortion. Quadratic phase errors are isolated along a single dimension by allowing image formation to an arbitrary grid instead of a Cartesian grid. This provides an opportunity for more efficient phase error corrections. We provide a description of the arbitrary image grid and we show the quadratic phase error correction derived from a second-order Taylor series approximation of the differential range. The algorithm is demonstrated with a point target simulation.
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LeRoy A. Gorham, LeRoy A. Gorham, Brian D. Rigling, Brian D. Rigling, } "Dual format algorithm for monostatic SAR", Proc. SPIE 7699, Algorithms for Synthetic Aperture Radar Imagery XVII, 769905 (21 April 2010); doi: 10.1117/12.855374; https://doi.org/10.1117/12.855374

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