并行高阶矩量法分析机载波导缝隙阵列研究

发布时间：2019-04-16 19:47

【摘要】：使用电磁计算方法来研究机载天线辐射特性可以大幅度降低工程设计成本,机载天线的电磁计算一直以来是天线布局的研究重点之一。由于载机平台的电尺寸往往比较大,天线阵列的结构往往比较复杂,要给出电磁仿真的精确解需要耗费非常大的计算资源,导致目前的计算机硬件尚难以解决如此大的计算量,所以本文从算法上给出了解决办法。本文由项目出发,做了以下方面的研究及工作。一、研究了高阶矩量法(HoMoM)这种高精度的算法。这种算法基于高阶基函数,在矩量法(Mo M)的基础上,计算飞机这种表面存在较大较平滑面片的模型时可以降低计算量。通过对模型网格的控制可以在一定程度上对模型的计算量进行控制。二、研究了波导窄边缝隙阵列天线。波导窄边缝隙阵列天线具有效率相对较高、体积相对较小、缝隙结构非常紧密、可以使用其设计出低副瓣天线等优点,这些年被广泛关注,并应用于设计机载天线上。但由于大型波导窄边缝隙阵列天线本身的电尺寸比较庞大,结构非常紧密,加之在天线工作的频段载机平台的电尺寸也非常大。所以非常难以计算出结果。三、本文研究了使用并行高阶矩量法结合区域分解算法计算机载波导缝隙阵列天线。电磁计算领域的区域分解算法是将一个电尺寸非常大的模型分为几个可以计算的部分,分别计算,然后通过迭代的方法来求解总场。本文给出一些算例由简入繁的验证了该算法的精确程度与可靠性,并将波导窄边缝隙阵列天线安装于飞机平台上,且阵列最大辐射方向分别指向机尾、机头等五个特定方向。最后,在满足工程所需计算精度的基础上,通过使用区域分解算法与高阶矩量法相结合的方法成功计算出了这几种情况下机载波导阵列的辐射特性。
[Abstract]:Using electromagnetic calculation method to study the radiation characteristics of airborne antenna can greatly reduce the cost of engineering design. The electromagnetic calculation of airborne antenna has always been one of the most important research points in antenna layout. Because of the large electric size of the platform and the complex structure of the antenna array, it takes a lot of computing resources to give the exact solution of the electromagnetic simulation, which makes it difficult for the current computer hardware to solve such a large amount of calculation. So this paper gives a solution from the algorithm. This article starts from the project, has done the following aspects research and the work. First, the high-order method of moments (mom), (HoMoM), which is a high-precision algorithm, is studied. Based on the higher-order basis function and the method of moments (Mo M), this algorithm can reduce the computational complexity when calculating the model with large and smoother patches on the aircraft surface. The calculation of the model can be controlled to a certain extent through the control of the model mesh. Second, the narrow-edge slot array antenna is studied. Waveguide narrow-edge slot array antenna has the advantages of relatively high efficiency, relatively small volume and very tight slot structure. It can be used to design low sidelobe antenna and so on. It has been paid more and more attention in recent years, and has been used in the design of airborne antenna. However, due to the large electrical size of the narrow-edge slot array antenna, the structure of the antenna is very tight, and the electric size of the platform is also very large in the frequency band of the antenna. Therefore, it is very difficult to calculate the results. Thirdly, the parallel high-order moment method combined with domain decomposition algorithm is used to study the waveguide slot array antenna carried by computer. The domain decomposition algorithm in the field of electromagnetic computation is to divide a model with a very large electric size into several parts which can be calculated separately and then solve the total field by iterative method. In this paper, some numerical examples are given to verify the accuracy and reliability of the algorithm, and the waveguide narrow-edge slot array antenna is installed on the aircraft platform, and the maximum radiation direction of the array points to five specific directions, such as the tail and the head of the aircraft respectively. Finally, the radiation characteristics of airborne waveguide array in these cases are calculated successfully by combining the domain decomposition algorithm with the high-order moment method on the basis of satisfying the calculation accuracy required by the engineering.
【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】：TN822

【共引文献】