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The radial velocity of moving ships during the beam irradiation time causes a Doppler shift in the multi-channel scanning synthetic aperture radar (MC-ScanSAR) system, leading to positioning mistake and the appearance of azimuth false targets in the focused image. Due to the varying Doppler spectrum range occupied by different targets in the MC-ScanSAR, and the unknown azimuth positions of ships, traditional Doppler analysis methods are not applicable to the MC-ScanSAR mode. The false targets observed in the focused SAR image are primarily caused by mismatches between the moving ships’ signals and the reconstruction processing. Based on this, this paper proposes a highly accurate moving ship velocity estimation algorithm for MC-ScanSAR system, which leverages the correlation between the main and false targets of ships in the imagery single-look complex (SLC) data. The effectiveness and robustness this algorithm have been validated through simulated ship echo data, demonstrating its application potential for high-resolution and ultrawide-swath sea surface in future MC-ScanSAR systems.

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Estimating Ship Radial Velocity from Single-Look Complex Data of Multi-Channel ScanSAR

  • 会议论文

  • 发表日期：

    2025年

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  • Jian Ma,
  • Kuan Wang,
  • Xiaoqing Wang,
  • Haixiao Yin,
  • Yunlong Guo,
  • Jian Xing

摘要

The radial velocity of moving ships during the beam irradiation time causes a Doppler shift in the multi-channel scanning synthetic aperture radar (MC-ScanSAR) system, leading to positioning mistake and the appearance of azimuth false targets in the focused image. Due to the varying Doppler spectrum range occupied by different targets in the MC-ScanSAR, and the unknown azimuth positions of ships, traditional Doppler analysis methods are not applicable to the MC-ScanSAR mode. The false targets observed in the focused SAR image are primarily caused by mismatches between the moving ships’ signals and the reconstruction processing. Based on this, this paper proposes a highly accurate moving ship velocity estimation algorithm for MC-ScanSAR system, which leverages the correlation between the main and false targets of ships in the imagery single-look complex (SLC) data. The effectiveness and robustness this algorithm have been validated through simulated ship echo data, demonstrating its application potential for high-resolution and ultrawide-swath sea surface in future MC-ScanSAR systems.