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Optimizing Processing Time of Radio-Astronomy Antenna Simulations Using FEKO

机译：使用Feko优化无线电天文天线仿真的处理时间

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摘要

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.
机译：在低频射频天文学中使用的几何大型和复杂天线的远场模式是计算昂贵的，以模拟电磁模拟器，例如Feko。例如，由256个日志定期天线元件组成的平方公里阵列的一个站需要数年才能使用全操作频带的全CAD模型来模拟。本文通过简化仿真模型来缩短单个天线元件的模拟时间，从而降低必须在模拟中解决的未知数的数量。描述了用于优化这种元素的简化的迭代过程，同时将反射系数保持在测量数据的1 dB绝对平均偏差内。在四次迭代之后，待解决的未知数量包括三角形和段的数量，从29,307降至11,991。这将计算时间减少了86.5％，使阵列仿真可行。使用本文中描述的技术，其他天线结构可以从中受益并更有效地模拟。

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