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A High-Resolution SAR Focusing Experiment Based on GF-3 Staring Data.

Mingyang Shang1,2,3, Bing Han4,5, Chibiao Ding6,7,8,9

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Summary

This study demonstrates high-resolution synthetic aperture radar (SAR) focusing using Gaofen-3 satellite staring spotlight (ST) data. The developed methods achieve excellent image quality, validating the ST mode

Keywords:
GF-3SARantenna patterncurved orbithigh-resolutionstaring spotlightstop-and-gotwo-step algorithm

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Area of Science:

  • Remote Sensing
  • Geophysics
  • Signal Processing

Background:

  • Spotlight synthetic aperture radar (SAR) offers higher resolution than traditional stripmap SAR.
  • The Gaofen-3 (GF-3) satellite provides staring spotlight (ST) mode data for advanced imaging.
  • Achieving high-resolution SAR images requires addressing specific processing challenges.

Purpose of the Study:

  • To conduct a high-resolution SAR focusing experiment using GF-3 ST mode data.
  • To detail and solve challenges in ST mode SAR image focusing.
  • To validate proposed focusing methodologies with actual satellite data.

Main Methods:

  • Utilizing a two-step processing algorithm for SAR image focusing.
  • Implementing curved-orbit model error correction.
  • Applying stop-and-go correction and antenna pattern demodulation.

Main Results:

  • Successful focusing of GF-3 ST mode data with 55 cm azimuth resolution.
  • Demonstration of effective solutions for ST mode processing challenges.
  • Obtained well-focused, high-resolution SAR images validating the methodology.

Conclusions:

  • The proposed methods enable effective high-resolution SAR focusing in ST mode.
  • The techniques are directly applicable to existing ground data processors.
  • This work validates the capability of GF-3 ST mode for high-resolution Earth observation.