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  • Research Article
  • Open Access

Detecting and Georegistering Moving Ground Targets in Airborne QuickSAR via Keystoning and Multiple-Phase Center Interferometry

EURASIP Journal on Advances in Signal Processing20082008:762505

  • Received: 29 March 2007
  • Accepted: 16 November 2007
  • Published:


SAR images experience significant range walk and, without some form of motion compensation, can be quite blurred. The MITRE-developed 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. Target radial motion also causes moving targets in synthetic aperture radar images to appear at locations offset from their true instantaneous locations on the ground. In a multichannel radar, the interferometric phase values associated with all nonmoving points on the ground 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.


  • Radar
  • Radial Velocity
  • Synthetic Aperture Radar
  • Motion Compensation
  • Synthetic Aperture Radar Image

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Authors’ Affiliations

The MITRE Corporation, 26 Electronic Parkway, Rome, NY 13441, USA
The MITRE Corporation, 202 Burlington Road, Route 62, Bedford, MA 01730-1420, USA


© P. K. Sanyal et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.