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Определение центров рассеяния сложных многослойных структур

Определение центров рассеяния сложных многослойных структур

Abstract

Задачи рассеяния электромагнитных волн многослойными объектами, расположенными на границе раздела (над границей или под границей) являются очень важными в радиолокации и связи. Разработан оригинальный алгоритм, улучшающий классические лучевые методы электродинамического анализа многослойных сред. Для решения задачи использован модифицированный метод геометрической оптики. Траектории лучей в модели многослойной среды представлены в виде набора направленных отрезков, каждый из которых есть геометрический путь луча между двумя соседними границами раздела сред. Разработан и протестирован оригинальный рекуррентный алгоритм определения лучей, многократно переотраженных между границами многослойной среды и рассеянных в направлении точки наблюдения. Модель подстилающей поверхности представлена в виде многослойного полупространства, шероховатость границ которого удовлетворяет критерию Релея. Описание алгоритма включает учет таких свойств многослойной среды, как потери в материале структуры, переотраженные в структуре лучи, кривизну фронта падающей волны и границ раздела сред. Модифицированный алгоритм геометрической оптики эффективнее, чем классический лучевой метод анализа объектов произвольной формы. Результаты для трехмерной задачи в виде тела вращения произвольной формы, полученные с помощью модифицированного оптического алгоритма, продемонстрировали их правильность. Получены численные результаты для многослойного тела вращения произвольной формы, расположенного в свободном пространстве и на подстилающей поверхности. Обсуждены вопросы нахождения центров рассеяния сложных многослойных структур.

Radar and communication problems of electromagnetic scattering by multilayer objects placed on boundary (up boundary or under boundary) are very important. Original algorithm improving classic ray methods of multilayer media electromagnetic analysis is developed. The modify method of geometrical optics is used to solve the problem. Ray tracing in a multilayered media model are presented by directed segments, each of which has a geometric path of the ray between the two neighboring boundaries. The original recurrent algorithm of determination of rays multiply reflected between boundaries of the multilayered media and scattering in the interest direction is created and tested. In this paper the model of the underlying surface is presented as the plane-layered half-space, the roughness of the interfaces which satisfies the Raleigh criterion. A description of that method including some details about multilayered media such as structure material lossings, multireflected in structure rays and curvature of front of incident wave are presented. The modify optical algorithm is more efficient than a classic ray method for analyzing arbitrarily shaped objects. Results for three-dimensional problems involving arbitrary shaped bodies of revolution structures have demonstrated the validity of the modify optical algorithm. Numerical analysis of layered arbitrary shaped body of revolution, located in free space and on underlying surfaces is carried out in the paper. Definition of scattering centers of complex multilayered structures is discussed.

Keywords

РАССЕЯНИЕ ЭЛЕКТРОМАГНИТНЫХ ВОЛН,ТРАЕКТОРИИ ЛУЧЕЙ,МНОГОСЛОЙНАЯ СРЕДА,СЛОЖНЫЙ МНОГОСЛОЙНЫЙ РАССЕИВАТЕЛЬ,ТЕЛО ВРАЩЕНИЯ,ПРОИЗВОЛЬНО ИСКРИВЛЕННАЯ ГРАНИЦА,РЕКУРРЕНТНЫЙ АЛГОРИТМ,SCATTERING OF ELECTROMAGNETIC WAVES,OPTICAL RAY TRACING,MULTILAYERED MEDIA,COMPLEX MULTILAYERED SCATTERER,BODY OF REVOLUTION,ARBITRARILY CURVED BOUNDARY,RECURRENT ALGORITHM

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average