Phase correction system for automatic focusing of synthetic aperture radar

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867368

Eichel, Paul H ^[1]; Ghiglia, Dennis C ^[2]

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1. Albuquerque, NM
2. Placitas, NM

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.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AC04-76
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4924229
• OSTI ID: 867368
• Country of Publication: United States
• Language: English

Related Subjects

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/