77-GHz otomotiv radarı ile çeşitli nesnelerin radar kesit alanı ölçümü ve radar kesit alanı simülasyon araçlarının değerlendirilmesi

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780085 Radar cross section measurement of various objects.pdf (8.63 MB)

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2022

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Department of Electrical & Electronics Engineering
Department of Electrical and Electronics Engineering (EE) offers solid graduate education and research program. Our Department is known for its student-centered and practice-oriented education. We are devoted to provide an exceptional educational experience to our students and prepare them for the highest personal and professional accomplishments. The advanced teaching and research laboratories are designed to educate the future workforce and meet the challenges of current technologies. The faculty's research activities are high voltage, electrical machinery, power systems, signal and image processing and photonics. Our students have exciting opportunities to participate in our department's research projects as well as in various activities sponsored by TUBİTAK, and other professional societies. European Remote Radio Laboratory project, which provides internet-access to our laboratories, has been accomplished under the leadership of our department with contributions from several European institutions.
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Airframe and Powerplant Maintenance
(2012)
The Atılım University Department of Airframe and Powerplant Maintenance has been offering Civil Aviation education in English since 2012. In an effort to provide the best level of education, ATILIM UNIVERSITY demonstrated its merit as a role model in Civil Aviation Education last year by being granted a SHY 147 certificate with the status of “Approved Aircraft Maintenance Training Institution” by the General Directorate of Civil Aviation. The SHY 147 is a certificate for Approved Aircraft Maintenance Training Institutions. It is granted to institutions where training programs have undergone inspection, and the quality of the education offered has been approved by the General Directorate of Civil Aviation. With our Civil Aviation Training Center at Esenboğa Airport (our hangar), and the two Cessna-337 planes with double piston engines both of which are fully operational, as well our Beechcraft C90 Kingait plaine with double Turboprop engines, Atılım University is an institution to offer hands-on technical training in civil aviation, and one that strives to take the education it offers to the extremes in terms of technology. The Atılım university Graduate School Department of Airframe and Powerplant Maintenance is a fully-equipped civil aviation school to complement its theoretical education with hands-on training using planes of various kinds. Even before their graduation, most of our students are hired in Turkey’s most prestigious institutions in such a rapidly-developing sector. We are looking forward to welcoming you at this modern and contemporary institution for your education in civil aviation.

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Bu tezde, RCS tahmini için en yaygın olarak kullanılan 2 adet elektromanyetik hesaplama yöntemi açıklanmakta ve karşılaştırılmaktadır. Bu karşılaştırmada yer alan yöntemler, yüzey integral denklemlerinin MoM çözümlemesi ile birlikte EFIE ve hibrit bir metod olup PO ve GO birleşimi ile ortaya çıkan SBR yöntemleridir. Öncelikle klasik elektromanyetik teorisi ve RCS hakkında temel bilgiler ve aralarındaki bağlantı sunulmuştur. Daha sonra, bahsedilen karşılaştırmanın teorik bilgi içermesi sebebi ile SBR ve IE yöntemleri için teorik kavramlar da sunulmaktadır. Bu yöntemlerin deneysel sonuçlar yoluyla da birbirleriyle karşılaştırılabilmesi için yapılan ölçümlerde üç hedef cisim kullanılmıştır. Ölçümler bir 77-81 GHz COTS FMCW radar sistemi ile gerçekleştirilmiştir. Ölçümler doğrultusunda, iki farklı ticari araç kullanılarak hem SBR hem de EFIE yöntemleri ile 77 GHz'de simülasyonlar yapılmıştır. Ölçüm ve simülasyon sonuçları arasında iyi bir uyum gözlemlenmekle beraber çeşitli şartlara bağlı olarak her iki yöntemin de kendilerine göre avantajları olduğu görülmektedir.
In this thesis, two of the most widely used computational EM methods which are being used for RCS prediction have been explained and compared. The methods involved in this comparison are Electric Field Integral Equation (EFIE) with Method of Moments (MoM) solution and Shooting and Bouncing Rays (SBR), which is a hybrid method consists of the combination of PO and GO. First of all, background information about classical theory of electromagnetism and Radar Cross Section (RCS) and also the connection between them were presented. Then theoretical concepts were given for IE and SBR methods since this comparison also includes theoretical knowledge. Three targets were used in the measurements so that these methods could be compared with each other experimentally. RCS measurement were performed with a 77-81 GHz Commercial Off-The-Shelf (COTS) Frequency Modulated Continuous Wave (FMCW) radar system. In accordance with measurements, simulations were also performed at 77 GHz with both SBR and EFIE methods using two different commercial tools. Good agreement was found between measurement and simulation results, also it was observed that depending on the task both methods have various advantages over themselves.

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Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering

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0

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76

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https://hdl.handle.net/20.500.14411/5149

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Master Tezler / Master Thesis