| In this paper, numerical calculation and analysis of the characteristic of the electromagnetic (EM) scattering from the 3D complex target are presented. The moment of method (MOM) and finite difference time domain (FDTD) are used to calculate the EM scattering from the 3D complex target. The physical optics method (PO) is adopted for studying the EM scattering from the target with large electrical size. The main works in this investigation are as following:1. Basic principles of the three classical methods including MOM, FDTD and PO are provided, and both the advantages and disadvantages of above three methods are discussed. The parallel algorithms based on the MPI parallel system are also presented.2. Triangular object model is applied to create the complex target, the radar cross section (RCS) of actual military target, including missile and aircraft with small electrical size is computed by the MOM, and the numerical results are compared with those obtained by the commercial software. Meanwhile, the characteristics of the EM scattering from the actual military target are investigated and the parallel acceleration ratio is shown and examined.3. Based on the FDTD technique, the complex target is modeled and meshed by the commercial software. The implementation of calculating the far field of the sphere is carried out and the numerical simulation is compared with that through the MIE theory. In addition, RCS of the military target is calculated and the characteristic of the RCS are also discussed. Moreover, the parallel acceleration ratio is also presented and analyzed.4. According to the PO method, triangular object model is presented to build the complex target. The RCS of military target with large electrical size is calculated, and the numerical results are also compared to those obtained by the commercial software. Similarly, the characteristic of the EM scattering and the parallel acceleration ratio are exhibited and discussed. |
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