Physical Optics Calculation of Electromagnetic Scattering From Haack Series Nose Cone
عنوان مقاله: Physical Optics Calculation of Electromagnetic Scattering From Haack Series Nose Cone
شناسه ملی مقاله: JR_JCESH-6-2_004
منتشر شده در شماره 2 دوره 6 فصل در سال 1396
شناسه ملی مقاله: JR_JCESH-6-2_004
منتشر شده در شماره 2 دوره 6 فصل در سال 1396
مشخصات نویسندگان مقاله:
Vahid Mohtashami - Ferdowsi University of Mashhad
Zohreh Asadi - Department of Electrical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
خلاصه مقاله:
Vahid Mohtashami - Ferdowsi University of Mashhad
Zohreh Asadi - Department of Electrical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
In this paper, the physical optics method is used to study the problem of electromagnetic scattering from Haack series nose cone. First, a meshing scheme is introduced which approximates the curvature of the surface by piecewise linear functions in both axial and rotational directions. This results in planar quadrilateral patches and enables efficient determination of the illuminated region and application of closed-form expression for computing physical optics integral. Then the ray-surface intersections are obtained using the implicit surface equation of Haack series nose cone. The equation obtained by the intersection test does not have analytical solution. Hence, the Steffensen s method is applied to solve this equation numerically. To find the initial point for Steffensen method s iterations, a bounding cylinder is used. It provides high precision evaluation of initial point, fast convergence and short computation time. Moreover, if the ray does not intersect the bounding volume, it certainly misses the bounded object and hence does not need to be tested in the Steffensen s method. The ray-cylinder intersection test has a simple analytical solution, which results in fast rejection of missed rays.
کلمات کلیدی: Bounding volume, Haack series, intersection test, mesh generation, physical optics
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/944248/