Brief Analysis of Aliasing in Polar and Keystone Formats for Spotlight Synthetic Aperture Radar
DOI:
https://doi.org/10.31224/osf.io/7dexnKeywords:
aliasing, backprojection, computational imaging, electrical engineering, fourier transform, Hankel transform, image formation, image processing, image reconstruction, imaging, keystone format, linear frequency modulation, polar format, polar format algorithm, projections, projection-slice theorem, radar, signal processing, spotlight synthetic aperture radar, stepped frequency sines, synthetic aperture radar, wave field, wave propagationAbstract
Keystone formatting [Doerry 2012] for spotlight synthetic aperture radar is an alternative to the popular polar format and reduces the computational burden of resampling the polar data to a rectangular grid before inverse Fourier transformation by a fast Fourier transform—-the polar format algorithm. After a brief review of relevant geometry and signals including linear frequency modulation and stepped sines, it is shown how to convert a polar-format radar into a keystone-format radar. Reconstructions from simulated data in both formats are shown and the differing kinds of image aliasing are examined.Downloads
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