Estimation of influence of chaotic roughnesses on target surface on their reflecting properties in sub-millimeter and terahertz waves
- 1 д.т.н., проф., зам. директора, Научно-исследовательский институт специального машиностроения МГТУ им. Н.Э. Баумана
- 2,3,5 к.т.н., доцент кафедры «Автономные информационные и управляющие системы», МГТУ им. Н.Э. Баумана
- 4 к.т.н., доцент кафедры «Автономные информационные и управляющие системы» , МГТУ им. Н.Э. Баумана
Abstract
Because of wide development of radar systems of sub-millimeter and terahertz ranges the problem of creation of mathematical model of their input signals from complex shape targets is actual. In sub-millimeter and terahertz ranges the surface roughnesses of the target have considerable influence on characteristics of scattering of the targets because sizes of roughnesses are comparable to length of a wave. In such conditions the field of scattering of the target differs from a field of scattering of a smooth surface as surfaces of all real objects are always rough.
Use of polygonal model as a mean of the description of geometry of the target is proved because of accuracy of representation of geometrical shape of the target. Article purpose is specification of a technique of calculation of characteristics of scattering of the targets in the form of polygonal models, for a case when on a target surface chaotic roughnesses are located. The mathematical technique which allows to describe statistics of roughnesses of the surface located on a surface of the target is developed. At creation of the technique known mathematical methods, such as a method of a tangent plane and a method of small roughnesses have been used. Statistical parametres of roughnesses, electrodynamic parametres of polygons and mathematical models of calculation of fields of scattering are integrated in object-oriented method.
In the article digital simulation of characteristics of scattering of the targets is carried out and dynamics of change of a signal in dependence of size of roughnesses is analysed. For an estimation of influence of a roughness on a target surface on level of the reflected signal calculations of radar cross section of ideally smooth sphere and sphere with roughnesses on frequencies f=330 GHz and f=1.6 THz are carried out. Appearing of fluctuations of radar cross section of sphere with roughnesses is described. As a result of calculations diagrams of radar cross section of fighter F-117 on frequency f=330 GHz are calculated for a case when the plane surface is covered by roughnesses with size of 5 mkm.
How to cite
Борзов А.Б., Лихоеденко К.П., Муратов И.В., Павлов Г.Л., Сучков В.Б. Оценка влияния хаотических неровностей на поверхности цели на их отражающие свойства в субмиллиметровом и терагерцевом диапазонах волн // Нелинейный мир. 2010. № 1. С. 12–21.
References
- Андреев Г.А.,Голунов В.А., Соколов А.В. Рассеяние и излучение миллиметровых радиоволн природными образованиями // Итоги науки и техники. Сер. Радиотехника. 1980. Т. 20. С. 3-106.
- Борзов А.Б.,Соколов А.В., Сучков В.Б. Цифровое моделирование входных сигналов систем ближней радиолокации от сложных радиолокационных сцен // Успехи современной радиоэлектроники. 2004. № 9-10. С. 38-62.
- Басс Ф.Г.,Фукс И.М. Рассеяние волн на статистически неровной поверхности. М.: Сов. радио, 1972.
- Андреев Г.А.,Куковкин А.Г., Черная Л.Ф. Альбедо и идикатрисы рассеяния миллиметровых волн земными покровами с хаотическим неровностями // Радиотехника и электроника. 1988. Т. 33. №7. С. 1352-1359.