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Accurate Range Modeling for High-Resolution Spaceborne Synthetic Aperture Radar.

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High-resolution spaceborne synthetic aperture radar (SAR) requires accurate echo signal models. This study introduces an advanced equivalent squint range model (AESRM) to improve spaceborne SAR imaging accuracy.

Keywords:
high resolutionnonlinear trajectoryrange modelspace geometrysynthetic aperture radar (SAR)

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Area of Science:

  • Remote Sensing
  • Geophysics

Background:

  • Spaceborne synthetic aperture radar (SAR) offers all-weather, all-day imaging capabilities.
  • Traditional SAR echo models are insufficient for high-resolution spaceborne systems due to orbital and Earth rotation effects.

Purpose of the Study:

  • To develop an accurate range model for high-resolution spaceborne SAR.
  • To address the limitations of existing models in accurately describing range history for nonlinear trajectories.

Main Methods:

  • Analysis of spaceborne SAR motion trajectory and Doppler parameters.
  • Development of an advanced equivalent squint range model (AESRM) incorporating third-order and fourth-order error terms.
  • Evaluation of existing range models and comparison with the proposed AESRM.

Main Results:

  • The proposed AESRM accurately fits the actual range history of spaceborne SAR.
  • AESRM effectively compensates for high-order term errors in range history.
  • Point target simulations validated significant improvements in fitting accuracy for nonlinear trajectories.

Conclusions:

  • The advanced equivalent squint range model (AESRM) enhances the accuracy of spaceborne SAR imaging.
  • AESRM provides a simplified yet effective approach for designing advanced SAR imaging algorithms.
  • This model enables higher resolution and more precise radar imaging for spaceborne SAR systems.