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

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
532556
Report Number(s):
SAND-97-0233C; CONF-971070-1
ON: DE97007950; BR: GC40400000; TRN: AHC29721%%106
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: IEEE Signal Processing Society international conference on image processing, Santa Barbara, CA (United States), 26 Oct 1997; Other Information: PBD: [1997]
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; RADAR; IMAGE PROCESSING; CORRECTIONS; DIGITAL FILTERS; ALGORITHMS; COMPUTERIZED SIMULATION; FORTRAN

Citation Formats

Doren, N.E., Jakowatz, C.V. Jr., Wahl, D.E., and Thompson, P.A.. General formulation for wavefront curvature correction in polar-formatted spotlight-mode SAR images using space-variant post-filtering. United States: N. p., 1997. Web.
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. United States.
Doren, N.E., Jakowatz, C.V. Jr., Wahl, D.E., and Thompson, P.A.. Wed . "General formulation for wavefront curvature correction in polar-formatted spotlight-mode SAR images using space-variant post-filtering". United States. doi:. https://www.osti.gov/servlets/purl/532556.
@article{osti_532556,
title = {General formulation for wavefront curvature correction in polar-formatted spotlight-mode SAR images using space-variant post-filtering},
author = {Doren, N.E. and Jakowatz, C.V. Jr. and Wahl, D.E. and Thompson, P.A.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 1997},
month = {Wed Oct 01 00:00:00 EDT 1997}
}

Conference:
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