研究目的
To expand the GTD model to any double scattering due to specular reflections or edge diffractions and derive the related frequency-dependence factor.
研究成果
The study proves that any double scattering due to specular reflections or edge diffraction conforms to the GTD model, with derived frequency-dependence factors for 20 representative built-up structures. Simulation results validate the theory, expanding the GTD model to provide more attributed information for feature abstraction in complex radar targets.
研究不足
The paper does not explicitly mention limitations, but potential areas for optimization could include the accuracy of the high-frequency approximation methods and the generalization to more complex multi-scattering mechanisms beyond double scattering.
1：Experimental Design and Method Selection:
The study uses a hybrid Geometrical Optics (GO) and Physical Optics (PO)/Physical Theory of Diffraction (PTD) method to derive the GTD model and frequency-dependence factors for double scattering mechanisms. A simulation is implemented using a high-frequency EM scattering prediction algorithm based on shooting and bouncing ray method (SBR), PO, and Equivalent Electrical Current (EEC) method to validate the theory.
2：Sample Selection and Data Sources:
The simulation involves 20 built-up structures combining any two of the five elementary mechanisms (flat surface, singly-curved surface, doubly-curved surface, straight edge, curved edge).
3：List of Experimental Equipment and Materials:
Not specified in the paper.
4：Experimental Procedures and Operational Workflow:
The simulation calculates swept frequency RCS for the structures over a frequency range of 8~18GHz with VV and HH polarizations, choosing incident directions against the propagating direction of the exiting ray. The RCS data is fitted to the GTD model to obtain α values.
5：Data Analysis Methods:
The stationary phase method is used to solve integrals in the theoretical derivation, and fitting techniques are applied to the simulated RCS data to extract α values.
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