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Channel Phase Calibration for High-Resolution and Wide-Swath SAR Imaging with Doppler Spectrum Sharpness

Man Zhang1, Sha Huan1, Zeya Zhao2

  • 1School of Electronic and Communication Engineering, Guangzhou University, Guangzhou 510006, China.

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|March 10, 2022
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Summary
This summary is machine-generated.

This study introduces a new calibration method for high resolution and wide swath (HRWS) synthetic aperture radar (SAR) systems. The technique optimizes the Doppler spectrum to reduce ambiguities in HRWS SAR imagery.

Keywords:
high resolution and wide swath (HRSW)maximum sharpness optimizationphase calibrationsynthetic aperture radar (SAR)

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Area of Science:

  • Remote Sensing
  • Signal Processing
  • Electromagnetics

Background:

  • Channel phase calibration is critical for high resolution and wide swath (HRWS) synthetic aperture radar (SAR) systems.
  • Precise calibration is essential for accurate Doppler spectrum reconstruction and minimizing ambiguities in HRWS imagery.

Purpose of the Study:

  • To propose a novel phase calibration method for HRWS SAR imagery.
  • To optimize the reconstructed unambiguous Doppler spectrum for improved image quality.

Main Methods:

  • A new calibration approach is presented for HRWS SAR systems.
  • The method utilizes the sharpness of the reconstructed Doppler spectrum as a metric for unambiguity quality.
  • Element phase errors due to channel imbalance are retrieved by maximizing spectral sharpness.

Main Results:

  • The proposed calibration method effectively suppresses ambiguities in HRWS SAR imagery.
  • Real data experiments validated the performance of the novel calibration technique.

Conclusions:

  • The developed calibration method significantly enhances the quality of HRWS SAR imagery.
  • Optimizing Doppler spectrum sharpness is a viable strategy for precise channel phase calibration in multi-channel SAR systems.