A Time-Varying Sea Clutter Simulation Method in Bistatic SARa

Spaceborne bistatic Synthetic Aperture Radar (SAR) has the advantages of multi-angle coverage, high-resolution imaging, and all-weather, all-day operational capability, making it highly valuable for sea surface target detection. However, sea clutter is a major source of interference in this process, affecting the accuracy of target detection. Due to the complex propagation paths and signal processing involved in bistatic SAR, the modeling of sea clutter remains a significant challenge. Currently, sea clutter modeling for bistatic SAR primarily employs geometric optics, physical optics, or hybrid methods, but these approaches are computationally intensive. This paper proposes a time-varying sea surface echo simulation method for bistatic SAR, which accurately calculates the backscattering coefficient of the sea surface and incorporates dynamic simulation of rough sea surfaces. The method provides high-precision simulations of sea surface scattering characteristics. Simulation results verify the effectiveness of the proposed method.