[Legacy Report] Groundwave Propagation Modeling Approaches and Numerical Simulation Tools

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Ground wave propagation has long been one of the important options for medium and long range communication. In addition to the classical LF/MF/HF broadcast and communication systems, emerging HF and VHF radar technologies, intelligent transportation or digital radio broadcast systems require understanding propagation characteristics over the Earth’s surface along realistic propagation paths. It is therefore propagation engineers’ or site surveyors’ dream to have a numerical propagation tool that calculates path losses between any two points marked on their digital maps. This necessitates the solution of electromagnetic (EM) wave equation in three-dimension (3D) which takes into account various EM effects, such as, the irregular terrain profile, the vegetation, the Earth’s curvature, the atmospheric refractivity, the presence of buildings, cars, and other obstacles, etc. Also, it must include all the relevant scattering components (e.g., multiple reflections and refractions, edge/tip diffractions, surface and/or leaky waves, etc.) that account for the path loss. Unfortunately, this is not yet in sight.
The aim of this presentation is to review groundwave propagation models and numerical propagation prediction tools and discuss problems and challenges as well as to project future developments. The focus will be on the Parabolic Equation model and its applications.
About the Speaker
L. Sevgi (IEEE SM) has been involved with complex electromagnetic problems and systems for more than 20 years. After completing his PhD with Prof. Leopold B. Felsen in New York in 1990 he joined Istanbul Technical University (ITU). He was the Chair of the Electronic Systems Department in TUBITAK-MRC, Information Technologies Research Institute between 1999 and 2000. He was awarded a two-year fellowship at the Weber Research Institute/Polytechnic University in New York in 1988 and also worked with the Scientific Research Group of Raytheon Systems, Canada during 1998 - 1999. He was with the Center for Defense Studies, ITUV-SAM for the Turkish Integrated Maritime Surveillance System (Long Horizon) studies between 1993 -1997, and, for the Vessel Traffic System installation for Turkish Straits between 2000 and 2002. Since 2001, he has been with Dogus University of Istanbul and has been the Director of MODSIM (Modeling and Simulation) Centre at the University. His research has focused on propagation in complex environments, RCS prediction and reduction, EMC/BEM modeling and measurements, analytical and numerical methods in electromagnetics, signal processing techniques and radar systems.
He is the writer/editor of “Testing ourselves” Column in the IEEE Antennas and Propagation Magazine, member of the IEEE Antennas and Propagation Society Education Committee, the “Scientific Literacy” column writer of the IEEE Region 8 Newsletter, a member of the editorial board of the IEEE Antennas and Propagation Magazine, ELEKTRIK, Turkish Journal of Electrical Engineering and Computer Sciences, American Journal of Food Technology, IJAP, Int. Journal of Antennas and Propagation, (HINDAWI Publishing), Asian Journal of Management, (ACADEMIC Journals).
He is the author or co-author of seven books, nearly 100 journal and 70 international conference papers.

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