18742

۱۸۷۴۲

محاسبه سطح مقطع راداري اهداف پيچيده با پوشش دي الكتريك با استفاده از روش هاي مجانبي

كارشناسي ارشد

مخابرات ميدان

تير ماه ۱۳۹۵

دكتر علي عبدالعالي

دكتر مجتبي دهملائيان

برق

1397/02/09

9/23/2018 12:00:00 AM

Abstract: In this thesis, a SBR code in MATLAB for computing the radar cross section of complex target coated with dielectric is implemented. This method is based on ray tracing and combining the PO and GO methods to calculate the RCS of scatterer. The thesis consists of three parts: In the first part, the conventional SBR algorithm is introduced to compute the RCS of objects and the formulation and the exit aperture is described too. In this phase, the surface of scatterer is used for aperture to gather all rays scattered form the object. Multiple scattering is added to the code in this part, though in the next sections some editions are done. In the second part, according to the time of simulation for complex targets, two algorithms are introduced to reduce the time of simulation and Increase the accuracy of the results. The 1st algorithm is known as multiresolution that is used for determining the incident plane with high accuracy according to the geometry of object. The 2nd algorithm is KD tree algorithm that is used to decrease the time of simulation. In the third part, RCS of different objects are computed and compared with fullwave MOM and MLFMM methods. At first the code is examined for simple objects like a plant, cube and cylinder in monostatic and bistatic cases. Numerical results are compared with results taken from FEKO. Keywords: SBR method, ray tracing, geometrical optic theory, physical optic theory, multiresolution algorithm, kd tree algorithm