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High Resolution Full-Aperture ISAR Processing through Modified Doppler History Based Motion Compensation.

Jung-Hwan Song1, Kee-Woong Lee2, Woo-Kyung Lee3

  • 1Department of Electronic and Information Engineering, Korea Aerospace University, 76 Hanggongdaehak-ro, Deogyang-gu, Goyang-si, Gyeonggi-do 412-791, Korea. junghwan-song@kau.kr.

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A novel inverse synthetic aperture radar (ISAR) technique enhances imaging resolution for unstable targets by using modified Doppler history and wide aperture processing. This method achieves high-resolution imagery of aircraft, even with non-linear motion.

Keywords:
autofocusinginverse synthetic aperture radarmotion compensationradar imagingtarget recognition

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Electromagnetics

Background:

  • High-resolution imaging of dynamic targets is challenging due to motion artifacts.
  • Traditional inverse synthetic aperture radar (ISAR) methods struggle with unstable targets exhibiting non-linear motion.
  • Accurate motion compensation is crucial for achieving clear ISAR imagery.

Purpose of the Study:

  • To present a high-resolution ISAR technique utilizing modified Doppler history for motion compensation.
  • To develop a novel wideband ISAR system capable of parametric processing over extended apertures.
  • To address the limitations of existing ISAR methods in imaging unstable targets with non-linear trajectories.

Main Methods:

  • A modified Doppler history based motion compensation technique is employed.
  • A novel wideband ISAR system is developed for parametric processing over extended aperture lengths.
  • The method is derived from an ISAR-to-SAR approach incorporating high-resolution spotlight SAR and sub-aperture recombination.

Main Results:

  • The proposed technique demonstrates robust performance against unstable targets with non-linear motions.
  • Doppler histories of full aperture ISAR echoes from disturbed targets are efficiently retrieved using good fitting models.
  • High-resolution ISAR imagery of real aircraft targets was successfully acquired, validating the method's feasibility.

Conclusions:

  • The developed ISAR technique effectively achieves high-resolution imaging of unstable targets.
  • The modified Doppler history based motion compensation is robust for non-linear target motions.
  • The wide aperture ISAR processing is feasible and validated for practical applications in target imaging.