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Title: Phase correction system for automatic focusing of synthetic aperture radar

A phase gradient autofocus system for use in synthetic aperture imaging accurately compensates for arbitrary phase errors in each imaged frame by locating highlighted areas and determining the phase disturbance or image spread associated with each of these highlight areas. An estimate of the image spread for each highlighted area in a line in the case of one dimensional processing or in a sector, in the case of two-dimensional processing, is determined. The phase error is determined using phase gradient processing. The phase error is then removed from the uncorrected image and the process is iteratively performed to substantially eliminate phase errors which can degrade the image.
Authors:
 [1] ;  [2] ;  [1]
  1. (Albuquerque, NM)
  2. (Placitas, NM)
Publication Date:
OSTI Identifier:
867368
Report Number(s):
US 4924229
DOE Contract Number:
AC04-76
Resource Type:
Patent
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
phase; correction; automatic; focusing; synthetic; aperture; radar; gradient; autofocus; imaging; accurately; compensates; arbitrary; errors; imaged; frame; locating; highlighted; determining; disturbance; image; spread; associated; highlight; estimate; line; dimensional; processing; sector; two-dimensional; determined; error; removed; uncorrected; process; iteratively; performed; substantially; eliminate; degrade; aperture imaging; aperture radar; phase error; synthetic aperture; phase errors; substantially eliminate; /342/