İyonkürede Dalga Yayılımı Modellemesi için Işın İzleme Algoritmalarının Grafik İşlemci Birimleri ile Paralel İşlenmesi

Abstract

In long range short wave (SW) communications, the transmitted signal passes through the ionosphere. Ionosphere approximately covers the area between about 80 kms and 1100 kms above the earth’s surface and it is mostly composed of ions and free electrons. This plasma medium in the ionosphere interacts with the electromagnetic wave passing through it and changes the path, strength, velocity and polarisation of the wave. Electron density in the ionosphere constantly changes depending on many factors such as geographical position, time, altitude and temperature. In SW communication, the transmitted signal reaches the receiver by following a curved path which is determined by the diffraction and scattering mechanisms caused by the ionosphere. The aim of this thesis study is investigate propagation of the to parallelize the ray tracing algorithms used in the short wave communication with graphics processors. First, the propagation of the independently transmitted signals through the ionosphere is investigated by ray tracing algorithms. After that, diffraction and dispersion models are reviewed for parallel programming and software activities are performed. Finally, the consistency of the result derived from software activities are tested and time measurements are made. As a result, the achievements obtained from the parallel programming activities with the graphics processors are mentioned.