研究目的
To study the computer simulation of SAR images of surface-ship wakes and compare the simulation results at different frequencies and polarizations.
研究成果
The simulation successfully models SAR images of Kelvin wakes, showing that wake signatures are observable across different wave bands and polarizations. The backscattering coefficient has little dependence on radar frequency but is significantly higher for HH polarization than VV polarization, with HH providing clearer images of cusp and transverse waves. Wakes from slow ships may be imaged clearly under small sea states.
研究不足
The simulation ignores turbulent wake and assumes only surface gravity waves. It relies on theoretical models and may not account for all real-world complexities such as nonlinear interactions or varying sea states.
1：Experimental Design and Method Selection:
The simulation combines hydrodynamic models (Kelvin wake model) and electromagnetic scattering models (Bragg mechanism) to generate SAR images of ship wakes. It involves calculating wave heights and radar backscatter coefficients.
2：Sample Selection and Data Sources:
No specific samples or datasets are mentioned; the simulation is based on theoretical models and input parameters such as ship speed, draft depth, wind direction, sea spectrum, polarization, and wavelength.
3：List of Experimental Equipment and Materials:
No physical equipment is used; the simulation is computational, likely performed on a computer with software for modeling and SAR imaging.
4：Experimental Procedures and Operational Workflow:
Steps include: a) Input ship parameters to simulate wake heights, b) Input wave parameters to simulate sea surface heights, c) Linearly superpose wake and wave heights, d) Input sensor parameters to simulate SAR image.
5：Data Analysis Methods:
Analysis involves comparing simulated SAR images and normalized radar cross-section (NRCS) values across different frequencies (X-band, C-band, L-band) and polarizations (HH, VV).
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