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7 May 2007Characterizing geolocation ambiguity responses in synthetic aperture radar: ground moving target indication
Single-channel synthetic aperture radar (SAR) can provide high quality, focused images of moving targets by utilizing
advanced SAR-GMTI techniques that focus all constant velocity targets into a three-dimensional space indexed by
range, cross-range and cross-range velocity. However, an inherent geolocation ambiguity exists in that multiple, distinct
moving targets may posses identical range versus time responses relative to a constant velocity collection platform.
Although these targets are uniquely located within a four-dimensional space (x-position, y-position, x-velocity, and y-velocity),
their responses are focused and mapped to the same three-dimensional position in the SAR-GMTI image cube.
Previous research has shown that circular SAR (CSAR) collection geometry is one way to break this ambiguity and
creates a four-dimensional detection space. This research determines the target resolution available in the detection
space as a function of different collection parameters. A metric is introduced to relate the resolvability of multiple target
responses for various parametric combinations, i.e., changes in key collection parameters such as integration time, slant
range, look angle, and carrier frequency.
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Matthew E. Holston, Michael J. Minardi, Michael A. Temple, Michael A. Saville, "Characterizing geolocation ambiguity responses in synthetic aperture radar: ground moving target indication," Proc. SPIE 6568, Algorithms for Synthetic Aperture Radar Imagery XIV, 656809 (7 May 2007); https://doi.org/10.1117/12.731455