General formulation for wavefront curvature correction in polar-formatted spotlight-mode SAR images using space-variant post-filtering

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In this paper, the authors introduce a general formulation for wavefront curvature correction in spotlight-mode SAR images formed using the polar-formatting algorithm (PFA). This correction is achieved through the use of an efficient, image domain space-variant filter which is applied as a post-processing step to PFA. Wavefront curvature defocus effects occur in certain SAR collection modes that include imaging at close range, using low center frequency, and/or imaging very large scenes. The formulation is general in that it corrects for wavefront curvature in roadside as well as squinted collection modes, with no computational penalty for correcting squint-mode images. Algorithms such ... continued below

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5 p.

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Doren, N. E.; Jakowatz, C. V., Jr.; Wahl, D. E. & Thompson, P. A. October 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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In this paper, the authors introduce a general formulation for wavefront curvature correction in spotlight-mode SAR images formed using the polar-formatting algorithm (PFA). This correction is achieved through the use of an efficient, image domain space-variant filter which is applied as a post-processing step to PFA. Wavefront curvature defocus effects occur in certain SAR collection modes that include imaging at close range, using low center frequency, and/or imaging very large scenes. The formulation is general in that it corrects for wavefront curvature in roadside as well as squinted collection modes, with no computational penalty for correcting squint-mode images. Algorithms such as the range migration technique (also known as seismic migration), and a recent enhancement known as frequency domain replication, FReD, have been developed to accommodate these wavefront curvature effects. However, they exhibit no clear computational advantage over space-variant post-filtering in conjunction with polar formatting (PF2). This paper will present the basic concepts of the formulation, and will provide computer results demonstrating the capabilities of space-variant post-filtering.

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5 p.

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OSTI as DE97007950

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  • IEEE Signal Processing Society international conference on image processing, Santa Barbara, CA (United States), 26 Oct 1997

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  • Other: DE97007950
  • Report No.: SAND--97-0233C
  • Report No.: CONF-971070--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 532556
  • Archival Resource Key: ark:/67531/metadc690076

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  • October 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 17, 2015, 1:08 p.m.

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Doren, N. E.; Jakowatz, C. V., Jr.; Wahl, D. E. & Thompson, P. A. General formulation for wavefront curvature correction in polar-formatted spotlight-mode SAR images using space-variant post-filtering, article, October 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc690076/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.