Optimizing Processing Time of Radio-Astronomy Antenna Simulations Using FEKO

IF 0.6 4区计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Applied Computational Electromagnetics Society Journal Pub Date : 2020-12-08 DOI:10.47037/2020.ACES.J.351007

Rowanne Steiner, D. Ung, A. Hubrechsen, Robert D. Jones, R. Wayth, M. Bentum, A. B. Smolders

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引用次数: 3

Abstract

─ The far-field pattern of a geometrically large and complex antenna used in low-frequency radio astronomy is computationally expensive to simulate on electromagnetic simulators, such as FEKO. For example, one station of the Square Kilometer Array, which consists of 256 log-periodic antenna elements, will take years to simulate using the full CAD model for the full operational frequency band. This paper focuses on reducing the simulation time for a single antenna element by simplifying the simulation model, thus decreasing the number of unknowns that have to be solved in a simulation. An iterative process for optimizing the simplification of such an element is described, while keeping the reflection coefficient within 1 dB absolute mean deviation of the measured data. After four iterations, the amount of unknowns to be solved, which includes the number of triangles and segments, was reduced from 29,307 to 11,991. This decreased the computation time by 86.5%, making array simulations feasible. Using the techniques described in the paper, other antenna constructions can benefit from it and be simulated more efficiently. Index Terms ─ Antenna, FEKO, optimization techniques, radio astronomy, square-kilometer array

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利用FEKO优化射电天文天线仿真处理时间

─ 低频射电天文学中使用的几何尺寸大且复杂的天线的远场方向图在电磁模拟器（如FEKO）上模拟计算成本很高。例如，平方公里阵列的一个站由256个对数周期天线元件组成，使用完整的CAD模型对整个工作频带进行模拟需要数年时间。本文的重点是通过简化仿真模型来减少单个天线元件的仿真时间，从而减少仿真中必须求解的未知数。描述了一种用于优化这种元件的简化的迭代过程，同时将反射系数保持在测量数据的1dB绝对平均偏差内。经过四次迭代，需要求解的未知量（包括三角形和线段的数量）从29307减少到11991。这减少了86.5%的计算时间，使阵列模拟变得可行。使用本文中描述的技术，其他天线结构可以从中受益，并可以更有效地进行模拟。索引术语─ 天线、FEKO、优化技术、射电天文学、平方公里阵列

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来源期刊

Applied Computational Electromagnetics Society Journal 工程技术-电信学

CiteScore

1.60

自引率

28.60%

发文量

审稿时长

9 months

期刊介绍： The ACES Journal is devoted to the exchange of information in computational electromagnetics, to the advancement of the state of the art, and to the promotion of related technical activities. A primary objective of the information exchange is the elimination of the need to "re-invent the wheel" to solve a previously solved computational problem in electrical engineering, physics, or related fields of study. The ACES Journal welcomes original, previously unpublished papers, relating to applied computational electromagnetics. All papers are refereed. A unique feature of ACES Journal is the publication of unsuccessful efforts in applied computational electromagnetics. Publication of such material provides a means to discuss problem areas in electromagnetic modeling. Manuscripts representing an unsuccessful application or negative result in computational electromagnetics is considered for publication only if a reasonable expectation of success (and a reasonable effort) are reflected. The technical activities promoted by this publication include code validation, performance analysis, and input/output standardization; code or technique optimization and error minimization; innovations in solution technique or in data input/output; identification of new applications for electromagnetics modeling codes and techniques; integration of computational electromagnetics techniques with new computer architectures; and correlation of computational parameters with physical mechanisms.