In this study, a MATLAB® / code based on the Shooting and Bouncing Ray (SBR)
algorithm is developed to compute the Radar Cross Section (RCS) of complex
targets. SBR is based on ray tracing and combine Geometric Optics (GO) and
Physical Optics (PO) approaches to compute the RCS of arbitrary scatterers. The
presented algorithm is examined in two parts / the first part addresses a new
aperture selection strategy named as &ldquo / conformal aperture&rdquo / , which is proposed and
formulated to increase the performance of the code outside the specular regions,
and the second part is devoted to testing the multiple scattering and shadowing
performance of the code. The conformal aperture approach consists of a
configuration that gathers all rays bouncing back from the target, and calculates
their contribution to RCS. Multiple scattering capability of the algorithm is
verified and tested over simple shapes. Ray tracing part of the code is also used as
v
a shadowing algorithm. In the first instance, simple shapes like sphere, plate,
cylinder and polyhedron are used to model simple targets. With primitive shapes,
complex targets can be modeled up to some degree. Later, patch representation is
used to model complex targets accurately. In order to test the whole code over
complex targets, a Computer Aided Design (CAD) format known as Stereo
Lithography (STL) mesh is used. Targets that are composed in CAD tools are
imported in STL mesh format and handled in the code. Different sweep
geometries are defined to compute the RCS of targets with respect to aspect
angles. Complex targets are selected according to their RCS characteristics to test
the code further. In addition to these, results are compared with PO, Method of
Moments (MoM) and Multilevel Fast Multipole Method (MLFMM) results
obtained from the FEKO software. These comparisons enabled us to improve the
code as possible as it is.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611087/index.pdf |
| Date | 01 September 2009 |
| Creators | Ozgun, Salim |
| Contributors | Kuzuoglu, Mustafa |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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