Title :
Scene Size Bounds for PFA Imaging with Postfiltering
Author :
Horvath, M.S. ; Gorham, L.A. ; Rigling, Brian D.
Author_Institution :
MacAulay-Brown, Inc., Dayton, OH, USA
Abstract :
The polar format algorithm (PFA) for synthetic aperture radar (SAR) image formation utilizes a first-order Taylor approximation of the differential range to improve computational efficiency, leading to image distortion and defocus. Limiting scene size by bounding the second-order Taylor series terms can restrict the impact of these errors, or alternatively, one may correct for these errors through spatially-variant filtering in post processing. In this letter we analyze the increase in allowable scene size that is realized through such processing.
Keywords :
approximation theory; radar imaging; spatial filters; synthetic aperture radar; PFA imaging; SAR image formation; first-order Taylor approximation; image defocus; image distortion; polar format algorithm; postfiltering processing; scene size bounds; second-order Taylor series terms; spatially-variant filtering; synthetic aperture radar;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
DOI :
10.1109/TAES.2013.6494427
