ELEKTROMANYETİK DALGA YAYILIMININ ÇİFT YÖNLÜ PARABOLİK DALGA MODELLEMESİ İÇİN BUHARLAŞMA OLUK ALGORİTMALARININ GELİŞTİRİLMESİ

Abstract

An important factor that is common in the marine and ocean environments and creates some standard rule violation for electromagnetic wave propagation is the evaporation ducts. The purpose of this thesis is to develop algorithms that model evaporation ducts and to analyze different evaporation duct models by adding these algorithms to the PETOOL program developed in the MATLAB Graphical User Interface (GUI) environment. Evaporation duct models are mainly explained by the Surface Layer Theory. These models are studied under two main headings as evaporation duct models based on the Monin-Obukhov Similarity Theory (MOST) and evaporation duct models based on the Liu-Katsaros-Businger (LKB) Theory. Modified refractivity - altitude graphs and duct heights of different evaporation duct models under various atmospheric conditions are compared by using the developed evaporation duct algorithms. The effect of atmospheric pressure, atmospheric temperature, atmospheric temperature measurement height, sea surface temperature, air-sea surface temperature difference, relative humidity, relative humidity measurement height, initial potential temperature, average surface layer temperature, wind speed, wind velocity measurement height and specific humidity that are used as input parameters, to evaporation duct models are examined in detail. The developed evaporation duct algorithms are combined with the two-way Fourier split-step technique used to solve the two-dimensional parabolic wave equation in the PETOOL program for electromagnetic wave propagation analysis. In order to use the algorithms added to the PETOOL program effectively, additional interface features are added to the PETOOL program. The evaporation duct algorithms attached to the PETOOL program can be used for different purposes such as training, research, analysis and planning of defense systems.