Detecting and Geo-Locating Moving Ground Targets in Airborne
QuickSAR via Keystoning and Multiple Phase Center
Interferometry
May 2007
P. K. Sanyal, The MITRE Corporation
D. M. Zasada, The MITRE Corporation
R. P. Perry, The MITRE Corporation
ABSTRACT
Without some form of motion
compensation, SAR images experience
significant range walk and can be quite
blurred. In 1997, MITRE reported
development of the Keystone Process.
The first stage of Keystone Formatting
simultaneously and automatically compensates
for range walk due to the radial velocity
component of each moving target, independent
of the number of targets or the value of each
target's radial velocity with respect to the
ground.
As is well known, target radial motion also
causes moving targets to appear in synthetic
aperture radar images at locations offset from
their true instantaneous locations on the
ground. In an appropriately configured multichannel
radar, the interferometric phase values
associated with all non-moving points on the
ground can be made to appear as a continuum
of phase differences while the moving targets
appear as interferometric phase discontinuities. By multiple threshold comparisons
and grouping of pixels within the intensity and
the phase images, we show that it is possible to
reliably detect and accurately georegister
moving targets within short duration SAR
(QuickSAR) images.
Additional Search Keywords
Airborne SAR, Geolocation,
Interferometry, Keystoning, Surface Moving
Targets
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