Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Reexamination Certificate
2006-12-05
2006-12-05
Sotomayor, John B. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
C342S02500R, C342S02500R, C342S161000, C342S194000, C342S195000
Reexamination Certificate
active
07145497
ABSTRACT:
Detection of moving targets in SAR images is improved by a radar on a moving platform for generating a focused synthetic aperture image of a scene The scene contains a target described by pixels within the SAR image. The radar has a monopulse antenna having a sum channel output and a difference channel output feeding analog to digital converters for converting the sum channel output and difference channel output into respective digital streams concurrently. The digital streams generate a difference channel SAR image and a sum channel SAR image.Target ratios are computed for those pixels descriptive of a target within the scene. Background ratios are computed for pixels around the target. Target ratios and background ratios define respective least square fit of angle discriminants. Comparing the target least square fit of angle discriminant with the background least square fit angle discriminant identifies an angle offset and a Doppler offset of the target with respect to the background.The background least square fit of angle discriminant using background ratios is computed for a region around the target. A 20 by 20 sum synthetic aperture pixels is evaluated as a background around the target.
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Krikorian Kapriel V.
Rosen Robert A.
Alkov Leonard A.
Gunther John E.
Raytheon Company
Sotomayor John B.
Vick Karl A.
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