Abstract

One of the possible physical mechanisms of so-called “angel” echoes, not visually observed radar discrete reflections from objects, is considered. The vortex flows can be the cause of “angel” echoes. They take out some volume of air with certain radiophysical parameters into the region of space with other radiophysical parameters of the air. Toroidal vortices (vortex rings) have a fairly long lifetime and can move to considerable distances without destruction. The calculation of radio wave scattering diagrams by vortex rings by modern universal programs designed to solve electrodynamic problems and based on the method of moments requires significant computational and time resources. The asymptotic calculation method of the electromagnetic waves scattering by dielectric toroidal formations of large radius is developed. Simulation and comparison of its results with calculations in Altair Feko is carried out, and their well coincidence is shown. The monostatic and bistatic effective scattering areas of vortex rings are calculated for interesting cases in practice. The calculation results for the monostatic location good enough coincide with the results of known experimental works.

中文翻译：

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介电环型气象构造电磁波散射的计算方法

摘要

考虑了所谓“天使”回声的一种可能的物理机制，而不是从物体上目视观察到的雷达离散反射。涡流可能是“天使”回声的原因。它们将具有一定放射性物理参数的一定体积的空气与空气的其他放射性物理参数一起带入空间区域。环形涡流（涡流环）的寿命相当长，并且可以移动到相当远的距离而不会被破坏。使用现代通用程序设计涡流环以解决电动力学问题，并基于矩量法来计算无线电波散射图，这需要大量的计算和时间资源。提出了大半径电介质环形结构散射电磁波的渐近计算方法。在Altair Feko中对其结果进行了仿真和比较，并显示了很好的一致性。在实际应用中，对涡旋环的单静态和双静态有效散射面积进行了计算。单静态位置的计算结果足够好，与已知实验工作的结果一致。