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A Robust Range Grating Lobe Suppression Method Based on Image Contrast for Stepped-Frequency SAR.

Wen-Bin Gao1, Teng Long2, Ze-Gang Ding3

  • 1Beijing Key Laboratory of Embedded Real-Time Information Processing Technology, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. wbingao@gmail.com.

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|December 9, 2016
PubMed
Summary
This summary is machine-generated.

A new data-driven method robustly suppresses grating lobes in synthetic aperture radar (SAR) images. This technique accurately estimates and compensates for periodic magnitude and phase errors (MEPE) in wideband waveforms, improving high-resolution range profiles.

Keywords:
contrast-basedgrating lobe suppression (GLS)magnitude error and phase error (MEPE)stepped-frequencysynthetic aperture radar (SAR)

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Electromagnetics

Background:

  • Magnitude and phase errors (MEPE) in stepped-frequency synthetic aperture radar (SAR) transfer functions cause periodic MEPE in synthesized wideband waveforms (SWW).
  • This periodic MEPE leads to undesirable grating lobes in high-resolution range profiles (HRRP).

Purpose of the Study:

  • To propose a robust, data-driven grating lobe suppression (GLS) method for SAR imaging.
  • To accurately estimate and compensate for periodic MEPE to mitigate grating lobe artifacts.

Main Methods:

  • A contrast-based error estimation method is employed.
  • Grating lobes of the brightest scatterers in the SAR image are utilized for MEPE estimation.
  • The estimated periodic MEPE is compensated to suppress range grating lobes.

Main Results:

  • The proposed method robustly estimates periodic MEPE.
  • Range grating lobes are suppressed to the background level of the SAR image.
  • Simulations and real data processing confirm the method's effectiveness.

Conclusions:

  • The developed GLS method provides a superior solution for grating lobe suppression in SAR.
  • Accurate MEPE compensation significantly enhances HRRP quality and SAR image interpretability.