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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
Summary
This summary is machine-generated.

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.

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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.

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.