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Related Experiment Videos

Motion measurement errors and autofocus in bistatic SAR.

Brian D Rigling1, Randolph L Moses

  • 1Department of Electrical Engineering, Wright State University, Dayton, OH 45435-0001, USA. brian.rigling@wright.edu

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|April 4, 2006
PubMed
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Motion measurement errors (MMEs) impact bistatic synthetic aperture radar (SAR) images. This study defines MME limits for system specifications and shows monostatic autofocus can correct bistatic SAR image defocus.

Area of Science:

  • Remote Sensing
  • Signal Processing

Background:

  • Bistatic synthetic aperture radar (SAR) systems are sensitive to motion measurement errors (MMEs).
  • Motion compensation to the scene origin is a standard but imperfect process.

Purpose of the Study:

  • To characterize the impact of low-frequency MMEs on bistatic SAR images.
  • To derive allowable MME limits for system specifications.
  • To investigate mitigation strategies for MME-induced image degradation.

Main Methods:

  • Analysis of phase history data affected by MMEs.
  • Characterization of low-frequency MME effects on bistatic SAR image quality.
  • Development of MME system specifications.
  • Demonstration of applying monostatic SAR autofocus algorithms to bistatic SAR images.

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Main Results:

  • Low-frequency MMEs introduce specific artifacts and defocus in bistatic SAR images.
  • Quantifiable limits for MMEs were derived to ensure acceptable image quality.
  • Proper image orientation enables the use of established monostatic SAR autofocus techniques for bistatic SAR.

Conclusions:

  • Understanding MME effects is crucial for designing robust bistatic SAR systems.
  • Derived MME specifications provide practical guidelines for system development.
  • Post-processing autofocus offers a viable method to correct MME-induced defocus in bistatic SAR imagery.