Hybrid PO-SBR-PTD method for composite scattering of a vehicle target on the ground

In this paper, a hybrid method of physical optics (PO) shooting and bouncing ray (SBR) physical theory of diffraction (PTD), is adopted to investigate the composite scattering of a vehicle target on the ground. Where the scattering of ground is calculated by the PO method, the scattering of the vehi...

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Bibliographic Details
Published in:Applied optics (2004) 2021-01, Vol.60 (1), p.179
Main Authors: Li, Juan, Zhao, Lei, Guo, Li-Xin, Li, Ke, Chai, Shui-Rong
Format: Article
Language:English
Subjects:
Computing time
Couplings
Data structures
Diffraction theory
Multipoles
Octrees
Physical optics
Ray tracing
Scattering
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Summary:In this paper, a hybrid method of physical optics (PO) shooting and bouncing ray (SBR) physical theory of diffraction (PTD), is adopted to investigate the composite scattering of a vehicle target on the ground. Where the scattering of ground is calculated by the PO method, the scattering of the vehicle target is computed by the SBR-PTD method, and the mutual couplings between them are solved by the ray tracing technique. In addition, an octree data structure is used to accelerate the ray tracing progress. A forward-backward ray tracing technique is employed to ensure the accuracy of the illuminated facet identification. In numerical simulation, the monostatic and bistatic scattering of a reduced-scale vehicle target are calculated by the SBR-PTD method and compared with the simulation results with the multilevel fast multipole method (MLFMM) in commercial software FEKO. And the composite scattering from a reduced-scale vehicle target on the planar ground by our PO-SBR-PTD method is also compared with the MLFMM. The results show that our methods can greatly reduce the computational time and memory requirement while keeping a satisfactory accuracy. Finally, the composite scattering from the vehicle target on the rough ground is demonstrated and analyzed for different incident parameters.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.412893