Abstract
In this study, fast calculations for the electromagnetic (EM) scattering of complex targets coated by radar absorbing materials have been reported. The Geometric Optics and Physical Optics (GO/PO) methods are combined with the modified surface reflection coefficient method, to solve the problem of EM scattering. Moreover, two acceleration techniques have been employed to improve the efficiency of computations. Firstly, the neighbor search technique is adopted to accelerate the ray tracing process in GO/PO. In this technique, an Octree structure is applied to divide the space into multiple subspaces, namely sub-nodes, where the efficiency of ray tracing can be improved through Morton code transform. In order to further reduce the computational time, parallel acceleration technique, based on GPU platform within the Compute Unified Device Architecture (CUDA) framework is introduced. Our proposed method has been verified from the nice correlation of simulated and multilevel fast multipole method (MLFMM) and CPU-based GO/PO methods. The runtime is compared with that of GO/PO method in serial model, responsible for a good speedup ratio. Finally, the influence of coating thicknesses and types of material on the EM scattering characteristics of the coated targets are also analyzed.
Highlights
Radar Cross Section (RCS) is an important feature in the fields of target detection and recognition
Modifying the surface reflection coefficient method can be employed to calculate the scattering field of lossy medium-coated targets, which can improve the accuracy without high computational cost
The combination of Geometric Optics and Physical Optics (GO/PO) method with modifying surface reflection coefficient method is beneficial for the investigation of EM scattering characteristics of the complex coated target with electrical large size
Summary
Radar Cross Section (RCS) is an important feature in the fields of target detection and recognition. We reported the neighbor search technique of Octree structure, to accelerate the ray tracing process [16]. This method uses structural characteristics of Octree and associates the sub-nodes of Octree with Morton codes. In case of GO/PO method, the neighbor search technique of Octree structure is utilized to accelerate the ray tracing process. Modifying the surface reflection coefficient method can be employed to calculate the scattering field of lossy medium-coated targets, which can improve the accuracy without high computational cost. The combination of GO/PO method with modifying surface reflection coefficient method is beneficial for the investigation of EM scattering characteristics of the complex coated target with electrical large size. The far-scattered fields of the illuminated facets are calculated by PO integral
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