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17 May 2006 Comparison of SAR based GMTI and standard GMTI in a dense target environment
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SAR-MTI is a generalization of SAR processing and can work with only a single-phase center. SAR-MTI requires formation of a stack of SAR images assuming different sensor ground speeds. Each image will capture a different set of target velocities, and the complete set of images will focus all target speeds less than a desired maximum speed regardless of direction and target location. SAR-MTI has no minimum detectable velocity. SAR-GMTI will have higher resolution than standard GMTI because the SAR based processing allows longer coherent processing intervals (CPI). A realistic dense moving target scenario was simulated using SAR-GMTI detection and standard GMTI detection was simulated for this scenario and the frequency of unresolved targets was compared. SAR-GMTI suffered many fewer unresolvable target pairs because of its smaller resolution cell and because it inherently detects in a 3 dimensional space vs. a two dimensional space. Furthermore SAR-GMTI does not have a clutter notch, which eliminated about 15% of the moving targets for standard GMTI.
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M. J. Minardi and E. G. Zelnio "Comparison of SAR based GMTI and standard GMTI in a dense target environment", Proc. SPIE 6237, Algorithms for Synthetic Aperture Radar Imagery XIII, 62370X (17 May 2006);

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