机载低副瓣阵列天线的设计与仿真

发布时间：2018-06-03 18:18

本文选题：高阶矩量法 + 多层快速多极子方法　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：电大尺寸平台中的天线性能分析一直是电磁工程领域的重要课题之一。在众多电磁计算方法中,矩量法(MoM)与物理光学法(PO)形成的混合方法(MoM-PO)经常被用来仿真此类问题。然而,对于低副瓣天线等实际应用,PO的计算精度往往难以满足工程需求。为了获得高精度仿真结果,一种理想的方法是利用MoM一体化仿真天线阵列与平台。虽然高阶基函数、核外技术、并行计算技术等先进技术的发展极大地扩展了MoM的仿真能力,但是对于数百波长的电大平台,由于计算资源限制,利用MoM进行精确仿真仍然比较困难。针对电大尺寸平台中天线性能分析,本文研究了低副瓣天线阵列的泰勒综合,并设计了一种有效的计算方法——高阶矩量法与多层快速多极子的混合方法(HoMoM-MLFMA)。天线阵列通常包含大量细小结构以及金属、介质材料,本文采用HoMoM进行仿真。与传统基函数(如RWG基函数)相比,高阶基函数显著降低了未知量,进而降低了计算量与存储量。为了避免矩阵方程迭代求解收敛慢的问题,HoMoM采用LU分解求解矩阵方程。对于电大尺寸平台,采用MLFMA进行仿真。然后通过近场考虑天线与平台之间的耦合。数值结果表明,HoMoM-MLFMA的计算精度明显优于MoM-PO。为了进一步提高HoMoM-MLFMA的计算能力,本文在串行算法基础上研究了HoMoM的矩阵分块并行策略及MLFMA的自适应平面波划分并行策略,并利用并行算法仿真了2132单元的微带天线阵列安装于400波长飞机平台后的受扰辐射特性。
[Abstract]:Antenna performance analysis in electrically large scale platform has been one of the most important topics in electromagnetic engineering field. Among the many electromagnetic calculation methods, the hybrid method of the method of moment (mom) and the physical optics method (POO) is often used to simulate this kind of problems. However, it is difficult to meet the engineering requirements for the practical applications such as low sidelobe antennas. In order to obtain high precision simulation results, an ideal method is to use MoM to simulate antenna array and platform. Although the development of advanced technologies such as high-order basis function, off-core technology, parallel computing technology has greatly expanded the simulation ability of MoM, but for the TV platform with hundreds of wavelengths, due to the limitation of computing resources, Accurate simulation using MoM is still difficult. Based on the analysis of antenna performance in electrically large scale platform, Taylor synthesis of low sidelobe antenna array is studied in this paper, and an effective calculation method, the hybrid method of high order moment method and multilayer fast multipole method, is designed. The antenna array usually contains a large number of small structures and metal and dielectric materials. In this paper, HoMoM is used to simulate the antenna array. Compared with the traditional basis function (such as RWG basis function), the higher order basis function reduces the unknowns significantly, and then reduces the computation and storage capacity. In order to avoid the problem of slow convergence of iterative solution of matrix equation, HoMoM uses LU factorization to solve matrix equation. For the electrically large scale platform, MLFMA is used to simulate. Then the coupling between the antenna and the platform is considered through the near field. The numerical results show that the calculation accuracy of HoMoM-MLFMA is obviously better than that of MoM-PO. In order to further improve the computing power of HoMoM-MLFMA, this paper studies the matrix partitioning parallel strategy of HoMoM and the adaptive plane-wave partitioning parallel strategy of MLFMA based on serial algorithm. The interference radiation characteristics of a 2132 cell microstrip antenna array installed on a 400-wavelength aircraft platform are simulated by using a parallel algorithm.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN820

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