Phase correction system for automatic focusing of synthetic aperture radar
Abstract
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.
- Inventors:
-
- Albuquerque, NM
- Placitas, NM
- (Albuquerque, NM)
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 867368
- Patent Number(s):
- 4924229
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING
- DOE Contract Number:
- AC04-76
- Resource Type:
- Patent
- 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/
Citation Formats
Eichel, Paul H, Ghiglia, Dennis C, and Jakowatz, Jr., Charles V. Phase correction system for automatic focusing of synthetic aperture radar. United States: N. p., 1990.
Web.
Eichel, Paul H, Ghiglia, Dennis C, & Jakowatz, Jr., Charles V. Phase correction system for automatic focusing of synthetic aperture radar. United States.
Eichel, Paul H, Ghiglia, Dennis C, and Jakowatz, Jr., Charles V. Mon .
"Phase correction system for automatic focusing of synthetic aperture radar". United States. https://www.osti.gov/servlets/purl/867368.
@article{osti_867368,
title = {Phase correction system for automatic focusing of synthetic aperture radar},
author = {Eichel, Paul H and Ghiglia, Dennis C and Jakowatz, Jr., Charles V.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}
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